In order to protect the lives and property of mine workers, the influence of rocks materials slope induced by coal mining was presented. Based on geological data, a case of the mining areas of Fengmaoding anti-dip slope in China was studied using simulation analysis methods. Results show that deformation and fracture of this slope was influenced by mining subsidence, and the rock and soil layer made subsidence deformation in the vertical direction under geostatic pressure. After the deformation became stability, it would make failure strain in the horizontal direction. If initial stress of the slap’s failure in surface exceeded the shear resistance,the slope gradually slipped down, and the landslides occurred finally.
We propose a framework based on stochastic collocation to solve autonomous vehicle optimal trajectory planning problems with probabilistic uncertainty. We model uncertainty from the location and size of obstacles. We develop stochastic pseudospectral methods to solve the minimum expectation cost of differential equation, which meets path, control, and boundary constraints. Results are shown on two examples of autonomous vehicle trajectory planning under uncertainty, which illustrated the feasibility and applicability of our method.
The thickness of overlaying bedrock is the main control factor of preservation, in addition, magmatic activities, different structural types and hydrogeological conditions are also control factors. Regional magmatic thermometamorphism appeared as a kind of superimposed effect on the background of deep metamorphism. Two Eastwest (EW)metamorphic belts in Shanxi tallied with the distribution of magmatic rock masses, resulting in coal seam gas exploitation and utilization bases of Yangquan and Jincheng mining areas. From gas-accumulation structural setting, closed type structures make high gas content in coal reservoir such as Qinnan, Gujiao, Xingjiashe, Dongshe areas in the Qinshui Basin, Shilou, Daning-Jixian and Sanjiao-Liulin areas in the Hedong Basin, gas content is 10-15 m³/t or even higher. There are convenient channels for coal seam gas effusion in the open structures; with lower gas content, such as Lishi mining area in Hedong Basin, Huoxi structural area in Qinshui Basin, Hunyuan, and Wutai coal districts.
Based on the occurrence condition of coal seams and the geological condition on coal seam mining in Coal Mine Group Baijiazhuang, after pillar mining the 8th coal seam was well controlled, ascending mining the 6th coal seam, mining process was numerically simulated by FLAC3D,the variation law of displacements field on interlayer strata between the 6th coal seam and the 8th coal seam at different face advance were analyzed. Vertical displacement on rock strata increased gradually from below. A control stratum existed on rock strata and could play a control function for steady of strata movement, which provides a theory basis for further study on upward mining.
Taking potential debris flow in Huyu Valley as research object, the investigation of geological condition in Huyu Valley and different accompanied geological processes has been investigated such as complex topography, natural weathering and source of loose debris produced by the accumulation of human engineering activities, the role of uneven rainfall. With the analysis of potential debris flow characteristics of the Huyu Valley comprehensively, the results showes that the potential debris flow of the Huyu Valley already has satisfied conditions.
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