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Currently more coal resource is buried in deep and more high-quality resource is located in the west of China. It makes a deep mining and a mining in the west become the new normal of coal resources exploitation. Thus a green mine construction, green mining development and green mining propulsion are imperative. This paper puts forward a"mining-dressing-backfilling+X"technical conception of green mining of coal resources. That is an underground integrated production system, which is integrated coal mining, coal-waste separation, and gangue backfilling with "active control of strata movement, gob-side entry retaining, gas extraction, disaster prevention, water-preserved-mining". The system forms a coal mining-dressing-backfilling+X(control, retain, extraction, prevention and preserved) collaborative production mode. The paper defines the"mining-dressing-backfilling+X"technical connotation and framework of greenmining, expounds "mining-dressing-backfilling+X"evolution of four generations, analyzes the specific technical advantages of its practice of green mining and gives the scientific engineering design method. The paper elaborates five aspects of typical "mining-dressing-backfilling + X"technology corresponding technical principle, engineering requirements, design process and methods, key technology and process equipment. Engineering practice of the Tangshan Coal mine, Zhaizhen Coal mine and 12 th Coal mine of Pingdingshan Group has respectively proved that "mining-dressingbackfilling+ control", "mining-dressing-backfilling + retain", "mining-dressing-backfilling + extraction " technologies have a remarkable technical superiority and the engineering demonstration effect. "Mining-dressing-backfilling + X "green mining extension in the future combines "mining-dressing-backfilling+processing", "mining-dressing-backfilling+intelligent", "mining-dressing-backfilling+adjustment"and "mining-dressing-backfilling +coordination". The overall formation of the "mining-dressing-backfilling+X"technology system can provide a strong technical support for the realization of green mining of coal and associated resources. [ABSTRACT FROM AUTHOR]

Aiming at the characteristics that series of environmental and ecological problems must be accompanied during opencast mining operations,the authors propose the concept of surface mining disturbance effect quantification and evaluation.This paper expounds the connotation and characteristics of Surface Mining Disturbance Index (SMDI).The SMDI is a comprehensive index which considers ecological damage and repair,mining technology and process optimization,energy consumption structure optimization,pollutant emission and treatment,production management and other aspects of the problem,uses multi-disciplinary theory to solve the difference between resource conditions,mining conditions,regional,coal and pollutant types etc.Ultimately,the system uses the numerical number between -100 to +100 to make an evaluation or prediction of SMDI temporal and spatial variation.This paper studies the basic principles of constructing the evaluation index system,and puts forward the basic framework of the index system,which includes 2 categories of all the 23 evaluation indexes,and points out the synthetic method of the SMDI. [ABSTRACT FROM AUTHOR]

The energy endowment characteristics of "relatively rich in coal, poor in oil, less natural gas, and uranium deficiency"in China result in that the coal resources as the China’s main energy will not change in the short term.Meanwhile, the relatively abundant coal resources are still the most stable and cost-effective competitive minerals in China.There should be a clear understanding that it is unrealistic, unwise and unscientific to abandon the actual energy choices based on coal to solve China’s energy problems. However, it should be noted that the coal resources have brought about environmental pollution, ecological damage, waste of resources, and high emissions in the whole process from geological exploration to development and utilization.Therefore, the development of the coal industry in China will certainly undergo some significant changes in the new era.Implementing scientific exploration and development, clean utilization, and low-carbon consumption, characterized by science, safety, ecology, high efficiency, standardization, digitization, and intelligence, is the only way to realize the sustainable development of China’s coal industry.Aimed at the challenges and opportunities for the coal industry in China, the present situation and existing problems of coal resources in the whole process from geological exploration to development and utilization is analyzed, and the strategic thinking of building an upgrade version of main energy( coal) industry in China is proposed.In this paper, the authors focus on 11 key scientific and technological problems faced in the process of realizing the upgrade version of China’s main energy( coal) industry, namely the problems of comprehensive coordination, green exploration, deep exploration, and intelligent exploration for coal resources in the process of geological exploration; the problems of green, safety, recovery rate, occupational health, and high benefit in the coal development process; the clean and low-carbon problems in the process of consumption and utilization.Meanwhile, the corresponding exploratory solutions are put forward.It is of great theoretical significance and practical value to promote the transformation and upgrading for China from a large coal producing country to a powerful coal industrial country, and also to address the sharp contradiction between China’s current economic and social development and the protection of ecological environment. [ABSTRACT FROM AUTHOR]

Water resources destruction and geological environment changes caused by mining in ecologically fragile areas of western China have seriously restricted the sustainable development of economy, society and environment in mining areas. Through reviewing the research progress of water-preserved coal mining and carrying capacity of geological environment in coal mining areas, and combining with the current situation of geological environment in western China rich in coal and short of water, the research framework of carrying capacity of geological environment based on the concept of water-preserved coal mining is proposed. It is considered that the function mechanism of "coal mining activity-water resource destruction-geological environment effect"should be systematically analyzed by combining the concept of water-preserved coal mining with the theory of carrying capacity of geological environment. The methods of attribute analysis, ecological demand analysis, numerical analysis and catastrophe theory should be used in studying the carrying capacity of geological environment. In particular, the quantitative method, comprehensive evaluation method and the classification method of carrying status and carrying capacity of geological environment should be investigated. By means of simulation experiment, the relationship data between the geological environment and the critical value of mining intensity under the carrying capacity of typical coal mine area are obtained. Then the technological method of coal mining under water-containing for controlling and alleviating the geological environment problems in coal mine area is extracted to determine the reasonable mining intensity and scale. On the basis of the research of carrying capacity, this paper put forward the collaborative monitoring method for the influencing factors of carrying capacity of geological environment, and the criterion of bearing capacity early warning grade of carrying capacity. The connotation and basic research ideas of geological environmental carrying capacity based on the concept of water-preserved coal mining will enrich the scientific connotation of water-preserved coal mining and geological environmental carrying capacity, and provide a theoretical and technical support for the coordinated development of coal resources and water resources protection in the fragile ecological environment areas of western China. [ABSTRACT FROM AUTHOR]

Coal mining with water protection is an inevitable choice for the sustainable development of ecologically fragile mining areas. The study and application of coal mining with water protection is an urgent problem to be solved in coal development planning, construction and production in northwest China. Taking Yushen mining area in northern Shaanxi Province as an example, this paper studies the types of water-preserved coal mining coalmines in combination with the quantity distribution of shallow water resources( water-preserved coal mining target seam) and the impact of coal mining on shallow water resources. Firstly, the spatial occurrence structure characteristics of eco-water-coal measures strata in the study area are analyzed. Also, the eco-geological environment types for the purpose of water-preserved coal mining are proposed, which are divided into oasis type with phreatic water and bottomland in desert, oasis type with surface water and valley river, loess gully type with surface runoff, and regional deep groundwater enrichment type. Secondly, the distribution of total storage per unit area of shallow water resources is calculated and determined. Then, based on the influence degree of coal mining on ecological layer and shallow water, four types of environmental engineering geological patterns( basically unaffected model, gradually restored model after destruction, gradually deteriorated model and disaster model) are proposed. Based on the analysis of the key indicators affecting the division of environmental engineering geological patterns, including the height of the water-flowing fractured zone and the mining water-resisting of residual aquiclude, etc., the zoning threshold and determination method for environmental engineering geological patterns is established. Finally, based on the distribution characteristics of shallow water resources and environmental engineering geological patterns, the grade types of water-preserved coal mining coalmines are put forward for the first time, which is divided into normal mining mine, water-preserved coal mining first-class mine, water-preserved coal mining second-class mine and water-preserved coal mining third-class mine. [ABSTRACT FROM AUTHOR]

In this paper, ligent GIS system of underground coal mine,the intelligent development plan and the working face design, the intelligent roadway rapid drivage technology, the intelligent technology of fully mechanized coal face, the intelligent main/ auxiliary transportation technology, the hazard sources intelligent perception and early warning technology, the intelligent washing system,the intelligent comprehensive support technology, and the comprehensive control system and operating platform of mine Internet of things. Furthermore,the development direction of intelligent open pit coal mine was expounded. The development ideas of constructing the information system of open pit coal mine, developing the intelligent continuous mining technology of open pit coal mine, establishing the integrated space-air-ground safety warning system in open pit coal mine,and promoting the coordinated green development of ecological environment in open pit coal mine were put forward. It is important to vigorously develop intelligent manufacturing of coal mining equipment, improve the reliability and adaptability of coal mining equipment, promote the robotized substitution of coal resource development, and provide intelligent equipment support for intelligent development of coal mining. Some policy suggestions were put forward, such as increasing policy support for intelligent development of coal mine, setting up special projects for the intelligent standard system construction of coal mine,and establishing a national experimental platform for the intelligent technology innovation of coal mine. a scientific idea was proposed,i. e. ,the intelligent coal mine is the core technology support for the coal industry development. The definition and general requirements of intelligent coal mine were expounded. The development goal of intelligent coal mine is to build smart coal mine. The connotation and relationship of coal mine intelligence, wisdom, informationization and digitalization were analyzed. Also,the construction principles and goal of intelligent coal mine were proposed. The top-layer design of intelligent coal mine was carried out,and the ideas of the integrated planning development mode of intelligent coal mine, the scientific design on the overall framework of intelligent coal mine,and the construction of 100 intelligent demonstration coal mines were put forward. In addition,the main development routes of intelligent coal mine were discussed including the precision geological exploration and 4d- inteli [ABSTRACT FROM AUTHOR]

On the basis of a brief overview of mining with backfilling history and the objectives, requirements and difficulties of developing modern mining with backfilling technology, this paper systematically introduced the research progress of fully mechanized mining with solid backfilling technology, focused on the expounding the strata movement theory of mining with dense backfilling, including equivalent mining height theory of strata movement control, continuous media mechanics model of strata movement, calculation formula of strata movement, and stope rock pressure and support stress analysis, which are the prerequisites of the new technology. And then detailedly introduced the system, equipments and technics of fully mechanized mining with solid backfilling technology, and the engineering examples of large-scale mining with backfilling under dense buildings, island village coal pillar, near the loosen aquifer and under the large embankment. [ABSTRACT FROM AUTHOR]