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The slope stability analysis and support structure design of temporary roads are particularly important for the normal traffic of roads and the safe construction of underground structures. In this paper, FLAC3D software is used to study the numerical simulation of steel pipe piles support structure of the slope of temporary road by using the equivalent stiffness method. It is shown that under the action of road load, the normal stress of steel pipe pile has a peak value at 1.0m above the bottom of foundation pit, and the shear stress has two peaks at 1.0m above the bottom of foundation pit and 0.5m above the pile tip, which decrease at the pile tip. The horizontal displacement of the pile occurs at different depth, the displacement of the pile top is the largest, and the displacement from the pile top to the bottom of foundation pit decreases nonlinearly, and the horizontal displacement of the pile below the bottom of foundation pit is very small and remains unchanged. The vertical displacement of the pile increases gradually from the pile top to the pile tip, which results in tensile deformation of the pile. Stress concentration occurs at the temporary road position in the slope, and obvious horizontal displacement and vertical displacement which have obvious differences in different positions appear in the slope. The arrangement of piles can ensure the stability of the slope and there will be no overall shear failure surface. [ABSTRACT FROM AUTHOR]

In this paper, the slope of the open pit of Dahongshan iron ore mine in Yunnan is taken as the research object, the safety coefficient and settlement values of the slope under natural and rainfall conditions are derived by the finite element software Midas/GTS, and the surface settlement versus time is produced by fusing the InSAR monitoring results of the study area for a whole year to judge the stability of the open pit slope. The results show that the settlement and deformation areas shown by numerical simulation and InSAR monitoring results are consistent; the comparison between InSAR monitoring results and rainfall intensity shows that the cumulative value of slope settlement has a high correlation with heavy rainfall. The safety coefficients of the slopes of the open pit under natural conditions and rainfall conditions are 1.50 and 1.21, the cumulative value of settlement in InSAR monitoring data for one year is 18.4 mm, and no obvious large deformation area is found. The use of numerical simulation combined with InSAR monitoring can realize the analysis of the stability of the slope of the open pit mine. [ABSTRACT FROM AUTHOR]

The optimization design of the open pit slope can ensure safety in production at the same time bring considerable economic benefits, so it is necessary to evaluate the stability of the initial excavation scheme of the high slope in an open-pit mine and optimize the initial slope angle according to the evaluation results. In this paper, an exhaustive study of Anyi open-pit mine in mouding County Yunnan province China has been made, and the following results have been achieved: (1)Confirmed the geological factors which affected the slope stability of open-pit mine; (2)Quantified the stability of the open-pit mine slope; (3) Under the premise of safety, the angle of the open pit high slope has been optimized on the base of the calculations of the open-pit mine high slope stability so as to ensure the maximum economic benefit. In this paper, the study area was divided into six zones. Firstly, qualitative analysis of slope stability was made by analogy method of engineering geology and stereographic projection method according to the orebody location, the properties of rock and soil in slope, the height of slope, and so on. The analysis shows that the preliminary design of slope angle is so large to ensure safety. Secondly, the stability of different slopes of a high slope is the quantitative analysis of different zones in high slope was made by two-dimensional limit equilibrium method and the finite difference method. In this paper, the mechanical parameters of rock are obtained by a laboratory test, and the stability of the high slope is quantitatively analyzed by two-dimensional limit equilibrium and three-dimensional numerical simulation. • Confirmed the geological factors which affected the slope stability. • Quantified the stability of the open-pit mine slope. • Under the premise of safety, the angle of the open pit high slope. • The preliminary design of slope angle is so large to ensure safety. [ABSTRACT FROM AUTHOR]

In this paper, we propose a new numerical approach abbreviated as Cos-SDA for analyzing strain localization problems of geomaterials. The Cos-SDA is achieved by implanting the strong discontinuity approach (SDA) into the computational framework of the Cosserat continuum finite element approach (Cos-FEA). Through two numerical examples of plane strain compression test and slope stability, it is demonstrated that the Cos-SDA model can effectively simulate the entire progressive failure process of geomaterials from weak discontinuity to strong discontinuity. Cos-SDA can effectively alleviate the influence of mesh distortion in shear zone, and the numerical solution can still maintain convergence even under large deformation. Cos-FEA and Cos-SDA have much stiffer mechanical response than SDA-FEA since an internal length scale is introduced into the governing equations. In contrast, the SDA-FEA shows more conservative as the unmature bifurcation occurs and weak discontinuous stage is ignored in the numerical simulation, while Cos-FEA numerical results show an over-stiff mechanical response in the stage of post failure. Cos-SDA inherits the advantages of both SDA-FEA and Cos-FEA and neutralizes their mechanical responses, so it is more reasonable in simulating the progressive failure process from weak discontinuity deformation (strain localization) to strong discontinuity deformation (slip) occurring in geomaerials. [ABSTRACT FROM AUTHOR]