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In this paper, various building data integration technologies are compared and analyzed in depth. According to the characteristics of green building information system, in order to solve the problem of data heterogeneity among different application systems, this paper proposes to build a green building information integration based on computer simulation technology system data integration program to integrate heterogeneous data of different application subsystems, and to solve the problem of data redundancy and inconsistency, and to provide users with a consistent and coordinated view of data and to shield the differences among heterogeneous data. In particular, this paper focuses on pattern integration based on computer simulation and design of computer simulation. Pattern integration is the key technical support of information integration system. After examining various mode integration methods, in order to eliminate the mode problems of different data sources, a method of pattern integration based on computer simulation is proposed in this paper and implemented in the green building information integration system. [ABSTRACT FROM AUTHOR]

In order to determine the reasonable number of demolished pre-drainage boreholes drilled along coal seams, against the backdrop of actual coal mines, the paper considered the comprehensive impact of pressure-relief ranges of the coal seams in front of the mining face, the advance rate of the working face, and drainage radius on the number of demolished pre-drainage boreholes. By means of numerical simulation and engineering verification, the paper determined the pressure-relief range of the coal seams in front of the mining face as 8.0m. Based on in situ mining progress and the relative production program, on the premise that the advance rate of the mining face remained constant, the paper analyzed the number of boreholes to demolish in front of the mining face at different gas pre- drainage time. The result showed that: when the gas pre- drainage time was defined as 30d, 60d and 90d, respectively, and the daily advancing distance of the working face was set as 3.6m at the same time, the number of boreholes to demolish was calculated to be 3, 3 and 2, respectively. This research result may act as a guidance to the reasonable deployment of mining programs in the coal mine, and may coordinate underground mining and gas extraction. It can also help realize coal seam outburst elimination and safety production to the greatest extent at the same time when economic benefits are maintained. [ABSTRACT FROM AUTHOR]

The geotechnical assessment, safe design and monitoring of highwalls is one of the major challenges in Indian open pit mines. The aim of opencast mines should be to attain steepest possible slope angle without compromising safety in order to maximize profits. Highwall stability is essential for economical and safe exploitation of mineral during open pit mining. Geotechnical investigations are required to quantify the properties of soils and rocks within the mining horizons. The required minimum safety factor for highwalls is 1.2. Highwall should be monitored during open pit operations. This paper addresses the main elements of pit slope failure, accident statistics, design, and monitoring and pit slope management and also the guidelines for safe design and monitoring of open pit highwalls in India. [ABSTRACT FROM AUTHOR]

Developing new energy is an important way to optimize energy structure, which makes significant sense on improving energy efficiency, reducing carbon emission, and lowering external dependence degree. New energy power generation costs are generally higher than conventional ones at this time. They would quickly decrease because of their scale effects, as technology improving and the scale expanding. Referring to the developing trend of new energy power generation costs, this paper sets the minimize generation costs and pollutant emission as optimization objectives, selects primary energy consumption and new installed generation capacity of each year as decision variables, and establishes an optimization model for new energy and energy structure. By setting and calculating the optimal energy structure, new energy developing scale, generation capacity and building sequences, we can get comparative results of power generation costs under three different scenarios, namely reference scenario, energy security scenario and low-carbon scenario. And use a sensitive analysis to clear the effect of total energy consumption and non-fossil energy consumption proportion. A simulation result shows resource and environmental benefits would be greater than new energy exploration and utilization costs. The larger scale, greater benefits and the less operation cost of the energy system as well as the lower external dependence degree will occur. Therefore, China should adhere to low-carbon energy structure developing direction, to improve energy conversion and utilization efficiency, to strengthen investment in new energy and finally achieve energy development strategies and goals. [ABSTRACT FROM AUTHOR]

With the gradual improvement of modern social life, more and more attentions are attracted to higher efficiency of refuelling process. However, large flow rapid refuelling process may result in unexpected turbulence and violating the safety standards. Since there are a few of existing literature researches the internal flow field in fuel tank during large flow rapid refuelling process, this paper carried out numerical simulation research for the gas-liquid twophase flow in oil tank under the condition of vertical refuelling and tilting filling in that circumstance, and devoted to research characteristics of the flow field inside the fuel tank and the cause of the foam formation under different fuelling conditions by using CFD software. The result of this study was of certain reference value to solve the problems of large foam and turbulence in flow field during large flow rapid refuelling process. [ABSTRACT FROM AUTHOR]

Liquid level control value is widely used in the process industry to control internal liquid height as pipe flow control component. During the operation of the liquid level control valve, the force condition of the value core directly affects the stability of the valve works. Therefore, it becomes the important factors in the design of the spring components of the liquid level control valve. In this paper, the internal flow field of the automatic control valve during closing process is simulated by using Fluent CFD software. The numerical simulation results show that in the process of closing the automatic control value, the water hammer phenomenon will be occurred at the beginning stage. With the continuation of the valve closing process, the pressure in upper chamber of the value core and internal chamber are rapidly reduced and tend to be gentle, while the pressure difference increases gradually. What is more, the flow of throttle gradually increases, and the inner chamber of the valve core appears small disturbance. These conclusions provide a theoretical basis for the technical design and improvement of the control valve. [ABSTRACT FROM AUTHOR]

Three-dimensional videos monitor basketball players' jump action and can enhance the accuracy of the jump shot of basketball players. In the implementation of video threedimensional monitoring on the precision of jump shot of basketball players, basketball players' jump shot images of different angles must be collected. But the previous means of monitoring can only analyze jump shots from a single perspective, which makes it difficult to obtain the video image of the jump shot movement completed and lowers the accuracy of three-dimensional video monitoring of basketball players' jump shot. In this paper, a threedimensional reconstruction method for basketball players' jump shot action is developed to perfect the KLT feature points, and the KLT feature point algorithm is first used to collect the jump shot motion images of basketball players from many angles. The camera projection matrix is constructed, and the external parameters between the camera and the specific coordinates of the athletes' jump shot action space points corresponding to each image matching point are figured out. According to the twodimensional data of joint force characteristic points in the process of basketball players' in situ jump shot in single video image sequence, the three-dimensional information is obtained. Finally, the three-dimensional video monitoring of the precision of the athlete's jump shot is completed. From the simulation results, it can be seen that the proposed algorithm can accurately establish the three-dimensional model for the jump shot motions of basketball players and can improve the precision of the jump shot of the basketball players comprehensively. [ABSTRACT FROM AUTHOR]

For weak rock mass with notable rheological property, instability is mostly caused by flowing deformation. As the basis for the design of roadway supporting structure, the rheological parameters of surrounding rocks are of great importance. Unfortunately, the rheological parameters obtained from indoor tests often fail to reflect the geological defects in a large research area due to the impact from constraints of sampling representativeness, sampling disturbance and testing technical level. What is worse, field tests are time-consuming, unrepeatable and costly. To solve these problems, this paper conducts inversion of the rheological parameters of surrounding rocks based on the BP neural network. Taking a mine roadway as an example and considering the vault subsidence data in the entrance section, the author applies FLAC3D in numerical simulation, adopts BP neural network for network learning and sample training, and performs displacement inversion of the rheological parameters of the surrounding rocks in the section. [ABSTRACT FROM AUTHOR]

Disposal of coal ash on surface comes as a part and package for meeting the society needs for thermal power. The conventional method of disposing it in ash ponds leads to requirement of more than 3 lakh acres of valuable land for its construction and can have damaging consequences with respect to water, air and land pollution. Hence, the need of the hour is to utilize this ash in an environment friendly manner. This paper throws light on the scheme for high concentration slurry disposal of ash in abandoned portion of the mine and design of embankment to contain it against the highwall. Two most common method for embankment construction, viz. upstream and downstream was modelled to evaluate its factor of safety with the help of PLAXIS software. Downstream method of embankment construction showed promising results and was selected for further analysis. Numerical simulation was carried out with downstream mode of construction in drained condition with and without the incorporation of vertical and horizontal drains. The embankment with drains exhibited higher safety factor which decreased when the embankment was raised. The construction scheme involves raising of embankment with slope angle of 270 in eight stages of ten meters height each and filling it with high concentration ash in layers. In the final stage, the top soil of 5m thick is proposed to be spread for revegetation. [ABSTRACT FROM AUTHOR]

Due to overe xploitation in the last years, coal under buildings and other structures has become a significant resource to maintain the sustainability of coal mines in China. However, buildings and other structures above mining area are easily damaged caused by surface subsidence after mining. In order to recover coal under surface structures and ensure the stability of surface structures, the short-strip coal recovery with backfill method is proposed. By using a numerical simulation, this paper simulates the subsidence of overlying strata to select the mining sequence and the strip width. A reasonable mining sequence is determined and the strip width is primarily selected as 5m or 6m. Afterward a physical simulation is conducted to validate the numerical simulation. And the subsidence law of overlying strata during mining and filling is analyzed for the 5m-width and 6m-width strip respectively. Finally, the reasonable strip width is determined as 6m according to the surface subsidence and production efficiency. By employing the above mining scheme, the surface subsidence and deformation of two surface structures above the mining area of Sima coal mine is predicted, which shows the mining scheme can ensure the stability of two surface structures above mining area. The research results provide a reasonable and reliable reference for coal recovery in thick coal seam under buildings and other structures. [ABSTRACT FROM AUTHOR]

External prestressing reinforcement belongs to active reinforcement field. Many researches on this technique have been done at home and abroad, but the numerical simulation is rare. In this paper, ANSYS is used to simulate the process of external prestressing reinforcement, and the influence of reinforcement method, effective prestress and reinforcement time on the reinforcement effect is analyzed. With the increase of tension-controlled stress, the reinforcement effect of simply supported beam is gradually enhanced, but the excessive tensile force can easily lead to the high stress state of anchoring end and external tendons, which is disadvantageous to the structure. With the delay of strengthening time, the cracking load and ultimate load are gradually reduced, and the reinforcement effect is gradually reduced. Therefore, in order to prolong the service life of the structure, it is necessary for the structure to carry on the timing inspection, discover the problem in time, and carry on the maintenance and reinforcement to the structure. [ABSTRACT FROM AUTHOR]

This paper studies characteristics of deformation failure and fracture growth of fractured coal-rock combination with RFPA2D numerical analysis software. Peak strength of the combination increases with increase of the dip of fracture and the peak strength when dip of fracture is 90° approaches to the peak strength without fracture. Under the same dip of fracture, peak strength of the combination when fracture is in the rock is higher than that in the coal, and fracture in the coal has more significant effect on the strength of the combination than in the rock. If fracture locations in combination are different, the characteristics of fracture growth are different. If dips of fracture in the same location are different, the fracture growth characteristics are different, too. However, fracture growth connection in coal is the main cause of overall failure of the combination body. During the loading, sound emission appears in two ends of fracture and the new fracture in the rock in upper end of the fracture, which mainly is caused by tensile failure. While in the coal, the new fracture in the end of fracture is caused by tensile failure; failures in other part are caused by both tensile failure and shear failure. [ABSTRACT FROM AUTHOR]

The value of virtual reality technology (VR) is gradually recognized today, and VR equipment has become an indispensable part of people's lives. This paper elaborates the development process and background of virtual reality technology through literature analysis, emphasizes the technical characteristics of virtual reality technology and its application in combination with 3D animation, and analyzes the visual impact of virtual reality technology on 3D animation. The application of 3D animation has very important practical significance. Finally, based on the status quo of the application of virtual reality technology, the prospect of the combination of virtual reality technology and 3D animation is prospected. [ABSTRACT FROM AUTHOR]

In this paper, it builds the geological simulations models for low resistance abnormity, high resistance abnormity, water flowing fault, water flowing subsided column, water accumulating gob and non-water accumulating gob according to the mine full-space transmit electromagnetic detection theory and by aiming at the several main water inrush structures of mine. Moreover, it gives numerical simulation to full-space transit electromagnetic responses of the several models above by utilizing MATLAB software, and the analytical research results indicate that the mine transit electromagnetism can distinguish the low resistance abnormity more obvious and the high resistance abnormity slightly inferior, especially that simulation detection curve of the water accumulating gob is more obvious. Simultaneously, the induced voltage corresponding to the low-resistance reaction is represented as high potential, and that corresponding to the high-resistance reaction is represented as low potential, and this trend is basically same as that of the half space. [ABSTRACT FROM AUTHOR]

There is a strong fluid-solid coupling effect during the process of coal seam pulse water infusion. Based on the basic principle of liquid-solid coupling, the dynamic damage evolution rule during coal seam pulse water infusion is simulated through secondary development of ABAQUS software. During this process the mathematical model of the strain accumulation model due to the periodic changes of pulse water pressure is embedded in SOIL module of ABAQUS software discussed in this paper, in order to obtain the dynamic damage evolution rule of coal seam around the pulse water infusion hole. It provides a new quantitative method of determining coal seam pulse water infusion parameters and location. The law of different parameters of pulse water infusion on the dynamic damage evolution of coal around the infusion hole is gotten. Numerical simulation results show that, during the process of coal seam high pressure pulse water infusion, the stress field and flow field are mutual influence and mutual restriction. The coupling of the stress and flow field have impact on the physical and mechanical properties of coal in front of the working face, these factors promote each other and prevent coal and gas outburst effectively. The coal damage quantity increases significantly with the water infusion time prolonging under constant water infusion pressure and frequency. The coal damage quantity increases significantly with the water infusion pressure increasing under constant water infusion time and frequency. The coal damage quantity increases significantly with the water infusion frequency increasing under constant water infusion pressure and time. So the pulse water infusion time needs to ensure a better effect of preventing coal and gas outburst is gotten. Meanwhile the pulse water infusion pressure needs to improve under the existing technical conditions. The frequency of pulse water infusion needs to improve under the existing technical conditions. This research results contribute to obtain accurate dynamic distribution law of damage fields around water infusion holes. It provides theoretical basis for optimizing pulse water infusion in technological parameters design and raising water infusion effect. [ABSTRACT FROM AUTHOR]

The coalbed methane need to be exploited before coal mining through gas drainage, in order to obtain the dual purposes of lower coal mine accident rate and transfer gas into treasure. There is a strong fluid-solid coupling effect during the gas drainage processing. The seepage law of coal from Guzhuang mine of China at different gas pressure is tested, and its klingberg coefficients is obtained by curve fitting method. Based on the klingberg effect, the liquid-solid coupling effect of coal and gas is simulated through secondary development of ABAQUS software in this paper, in order to obtain the dynamic variation rule of gas pressure field and seepage field around the gas drainage hole. It provides a new quantitative method of determining gas drainage parameters and location. Numerical simulation results show that, during the processing of gas drainage, the stress field and seepage field are mutual influence and restriction, the gas pressure around the drainage holes is reduced and the coal seam stress relief, permeability increases, these play a prominent role in the effective prevention of coal and gas outburst. Research results contribute to obtain accurate dynamic distribution law of the stress and seepage fields around gas drainage holes. It provides theoretical basis for optimizing gas drainage technology and raising gas drainage effect. Gas drainage generally defined as the high concentration gas is extracted using gas pumps or other drainage device, and high density gas is discharged into the ground or the total return airway through the isolated pipe network [1]. The gas drainage is an effective measure for preventing coal and gas outburst, gas explosions and gas emission. The dual purpose with lower coal mine accident rate and transfer gas into treasure can be gotten. At present, China's coalbed methane exploitation is lagging behind. Theoretical research and effective analysis method about gas drainage technology design are rare [2-8]. As the gas pressure changes, the permeability of the coal body significantly changes due to klingberg effect during the gas drainage process. It has important impact on the gas seepage. So the fluid-solid coupling effect has important impact on gas seepage during gas drainage process. The fluid-solid coupling law of gas and coal is analyzed using the ABAQUS software during gas drainage process. The research result of coupling effect of gas pressure field and stress field has important theoretical value and practical significance on revealing the mechanism of gas drainage preventing coal and gas outburst and field implementation of the gas drainage for preventing coal and gas outburst. [ABSTRACT FROM AUTHOR]

Based on the special conditions of Changzhi 3# coal seam in Shanxi province, the stress field and plastic zone of surrounding rock in thick coal seam roadway with large cross section under different side pressure coefficient (λ) are studied by using finite element software FLAC3D. The weak position of roadway is analyzed, and the stress direction of roadway support under different side pressure coefficient (λ<1) is put forward. (2). When λ = 1, both sides of the roadway and the roof are equally important and should not be neglected; (3) When λ>1, the stress concentration zone gradually shifts to the vicinity of the floor, and the maintenance of the floor should also be considered. According to the measured lateral pressure coefficients and numerical simulation results of the auxiliary roadway in the Changzhi coal mine, the main support direction of the roadway is provided. According to the convergence of the field section, the deformation law of the surrounding rock is basically consistent with the simulation results, which provides a new idea for the design of the roadway support. [ABSTRACT FROM AUTHOR]

Ribs and snooks are the critical natural support at the goaf edge in the mechanized depillaring operation of the bord and pillar mining system. The pillar extraction has been carried out by taking the slices and leaving ribs and snooks during the depillaring operation. Remnants are the remaining portion of the extracted pillar. The depillaring operation leads to an unsupported roof, and the immediate unsupported roof imposes its weight on the pillar (remnant) under extraction. The remnant's purpose is to provide a necessary reaction to the overhang to restrict roof failure until the pillar's final slice. The remnant's stability during depillaring operation has been accessed in the study using three-dimensional numerical simulations. A scheme has also been proposed in the study to evaluate the factor of safety (FOS*) of the remnant pillar in the residual phase at different stages of slicing operation. A case of an Indian coal mine using the fish-bone method has been chosen for the study. A typical depillaring stage has been selected for the extraction of the pillar using the fish-bone method. The numerical simulation of the considered panel provides the vertical stress and yielding profile on the pillars at different stages of depillaring. The simulation results show the influence zone up to one pillar from the goaf edge. The immediate intact pillar shows considerable yielding of about 60% of the pillar area. The remnants have completely yielded during the slicing operation but provide a reaction to the immediate strata. The remnant should provide the reaction to the immediate roof till taking the final slice from the pillar. The remnant's FOS* is calculated by taking the ratio of reaction offered by the remnant (numerical simulations) and the weight of the overhang (estimation). The area's borehole section shows two layers of medium to coarse-grained sandstone as an immediate stratum. The weight of the immediate strata has been estimated in the study considering the immediate strata's thickness. Two different scenarios of immediate strata thickness (i.e., 4.75 m and 9 m) have been considered in the study to evaluate the remnant's FOS at different depillaring stages. [ABSTRACT FROM AUTHOR]

Maintaining the stability of overburden dumps in opencast mines is a major challenge. Instability in dump slope occurs because of many inherent factors, cracks formed by mining activities, and natural climatic conditions etc. have been considered in this study. Numerical simulation of the dump slope has been performed using RS2 (Rocscience) software based on the finite element method (FEM). In simulation, the effect of cracks by considering the crack inclination, crack location from the crest of the dump slope, and effect of crack length and crack inclination at critical failure surface location has been analyzed. It has been found for the given conditions that cracks at a distance less than 7.5m from the crest of the slope for inclination 30° to 50° have the least stability and crack at critical failure surface location for inclination 40°, and 50° have a significant effect on the stability of the dump slope for all the considered crack length. [ABSTRACT FROM AUTHOR]

Aimed at the large amount of mining roadway roof subsidence in argillaceous rock, as well as frequently happened roof caving accidents, the mining roadway from Baode coal mine was taken as the research background. By the integrated use of field measurement, numerical simulation, and the theoretical analysis, the deformationfailure characteristics and engineering controllability of mining roadway roof in argillaceous rock was studied. The results indicate that: During the mining influence. This kind of roadway suffers serious roof deformation and failure and has little to do with the increase of the support strength. The roof subsidence is far out of the endurance of the anchor cable. The roof breakage depth is around 4.0m. With the existing technology, it is not available to limit the roof subsidence by high-strength bolting, and it is a must to adopt the supporting method with good extension property, which gives priority to roof caving control. Accordingly, the control strategy which gives priority to long-extension bolt appeared. The engineering testing results indicate that this technology can coordinate with the roof deformation, thus effectively prevent the roof caving. [ABSTRACT FROM AUTHOR]

The optimization of reasonable limit for depth of deflection point has a fundamental significance to guide the design of wellbore trajectory. Considering energy saving and optimum scheme for mechanical oil production, the section plane type of wellbore trajectory is selected. The reasonable limit for depth of deflection point is optimized with different vertical depths and horizontal displacements. The results show that: if the evaluation life of oil well is short, take ten years for example, the optimal depth of deflection point is influenced by the cost of increasing drilling footage. And the optimal depth of deflection point is small. When evaluation life of oil well is long, take fifty years for example, the optimal depth of deflection point is influenced by cost of increase in energy consumption and centralizer. And the optimal depth of deflection point is large. With increasing the horizontal displacement, the optimal depth of deflection point is restrained by minimum curvature radius in the process of drilling. The above results have great theoretical and practical significance on allocation optimization of multiple well platform and rational evaluation of energy-saving potential. [ABSTRACT FROM AUTHOR]

Recently, because of villagers' production and life style have changed, the physical environment such as ventilation, lighting and insulation of traditional seaweed house in Jiaodong peninsula cannot meet their current needs, the work for improvement in building physical environment appears to be particularly urgent. This study is based on the method of pre-investigation, field-test and post-simulation as well as analytical skills by software of "ECOTECT" and "PHOENICS". Through the housing usage analysis, field test analysis and data simulation analysis, the experimental results are summarized as follows: Firstly, open 600mm×600mm high window in each bedroom, secondly, optimize the materials of doors and windows, thirdly, bedroom is transformed into the kitchenand lastly, install ventilators in kitchen and toilet. The results of this work will provide technical guidance for the improvement in traditional seaweed houses' living environment in Jiaodong peninsula. [ABSTRACT FROM AUTHOR]

Based on the mechanism of spontaneous combustion of coal, the theory of gas drainage and the theory of three zones of spontaneous combustion, the application and research status are summarized at home and abroad.The preliminary understanding of gas drainage and spontaneous combustion in gob is expounded. And research status and the source of subject of spontaneous combustion and gas drainage in gob in domestic and foreign on influence of spontaneous combustion is introduced in detailed. The application study of spontaneous combustion of abandoned coal in gob of numerical simulation is mainly studied. The research background that is based on 5242Z working face in gob in lvjiatuo coal of Kailuan group, it introduces duct monitoring system that is established in 12# coal seam of 5242Z working face. Beam tube monitoring is the main method in the experiment.Through the beam tube are arranged reasonable in gob, the gas bladder with regular sampling was analyzed by gas chromatography. It has achieved continuous monitoring to spontaneous combustion in gob and has measured the distribution situation of oxygen concentration of different locations inside the gob. To measure the "three zones" division of spontaneous combustion more accurate, by setting the parameters under the same conditions, the COMSOL numerical simulation software is used to solve the mathematical model of oxygen concentration and the field distribution of oxygen concentration in mined out area can be obtained. According to the simulated results, the range of three spontaneous combustion zones in goaf is determined, and the accuracy of the division of "three zones" is ensured. According to the oxygen concentration index, the result is that the heat dissipation zone is mainly distributed in the coal wall 0~15m area from the working face, the spontaneous combustion zone is mainly distributed in the coal wall 15~45m area from the working face and the suffocation zone is mainly distributed in gob outside the coal wall 45m of the working face, which provides a reference for the formulation of the technical scheme for mine fire prevention and control in the later period. The comparison between the measured and simulated the actual results of the monitoring of the beam pipe in the mined out area shows that the actual measurement coordinate points essentially coincide with the contour lines that are processed by simulation results. There is little difference in the division of "three zones" of spontaneous combustion in gob to monitoring results and simulation calculation results of beam and tube in mined out area. Therefore, the validity of the numerical simulation is verified. [ABSTRACT FROM AUTHOR]

Combined the mechanism of gob-side entry retaining by roof cutting pressure relief and the geological conditions of Jiaozishan coal mine, the influence of gob-side entry retaining from the depth of blasting bore in the process of roof cutting pressure relief was studied by the method of FLAC3D numerical simulation. When the depth of blasting bore was 4m, it was most significant that the surrounding rock stress of roadway transferred to the roadway deep; meanwhile, the surrounding rock deformation was also the minimum. And the result was applied to an industrial practice in the intake airflow roadway of the 9706 working face. When the working face was mined, the surrounding rock deformation was basically identical between the coalside entry in front of the working face and the gob-side entry behind the working face, which met the requirements of retaining roadway and production next working face. It successfully reduced the difficulty of protecting roadway and the loss of coal pillar, and achieved remarkable economic and social benefits. [ABSTRACT FROM AUTHOR]

According to the complexity of internal solid-liquid two phase flow field of KYF flotation machine, we determine the boundary condition for the numerical simulation of solidliquid two phase flow field, use the mathematical model of discrete solid-zero equation, and standard k-epsilon turbulence model for continuous liquid phase, and explore the impact of different mineral particle sizes, densities and viscosities on characteristics of internal solid-liquid two phase flow field of KYF flotation machine. The results of the research are of the guiding significance and practical application value to further improve the separation effect of flotation machine and develop efficient flotation equipment. [ABSTRACT FROM AUTHOR]

Combined the mechanism of gob-side entry retaining by roof cutting pressure relief and the geological conditions of Jiaozishan coal mine, the influence of gob-side entry retaining from the depth of blasting bore in the process of roof cutting pressure relief was studied by the method of FLAC3D numerical simulation. When the depth of blasting bore was 4m, it was most significant that the surrounding rock stress of roadway transferred to the roadway deep; meanwhile, the surrounding rock deformation was also the minimum. And the result was applied to an industrial practice in the intake airflow roadway of the 9706 working face. When the working face was mined, the surrounding rock deformation was basically identical between the coalside entry in front of the working face and the gob-side entry behind the working face, which met the requirements of retaining roadway and production in the next working face. It successfully reduced the difficulty of protecting roadway and the loss of coal pillar, and achieved remarkable economic and social benefits. [ABSTRACT FROM AUTHOR]

To investigate the performance of multi-layer aluminum honeycombs under compression, experiments have been carried out, where crush behaviours were compared between two combinations by using finite element program ANSYS/LS-DYNA, and the validation of the FE model was approved by comparing the simulation result with the data from the experiment. The results show that the forcedisplacement curves of a multi-layer aluminum honeycomb reflect a trend, in which the peak forces decrease gradually with the increase of layers and the plateau stage is getting shorter with the curves becoming increasingly smooth. This trend is viewed as being beneficial to the compressive process when the specimens are fully crushed. The energy absorption is basically linearly proportional to the number of layers. The staggered arrangement should be given priority due to its energy absorption property. [ABSTRACT FROM AUTHOR]