Slope Deformation Mechanisms Under Exposed And Underground Mining

Takes the Zi Jin Shan Au-Cu Ore mining practices and engineering geology as the engineering background, using numerical simulation and limit equilibrium method, etc., exploring the rock deformation law of slope by the influence of open-pit to underground mining, summarized the slope deformation mechanisms under the condition of open-pit and underground mining at the same time; and carried out the stability evaluation. The main research results are as follows:1) Application of numerical simulation methods+100m ore mined below the level of the numerical simulation and analysis system, revealing the relative change in the relative position of the mining and exploitation of space on the size of the change induced by overburden rock movement law and slope sliding mechanism. Proposed slope body and underground mining areas at different positions relative spatial distribution of the conditions of three sliding failure modes, namely the toe area, slope and slope in the area outside the area. When underground mining area in the toe, with changes in mining width of underground mining effect causes the main break facing downhill offset the effect of the displacement vector superposition of two mining induced increase, thereby inducing the overall slope angle increases large, which adversely affect slope stability, stability coefficient decreases. When the mining area is located well outside the area when the slope, the superposition of two mining effect the performance of the deformation characteristics of the slope down to move the boundary line between the main section of the region, reducing the displacement vector synthesis; mining dimension when considered separately, the overall effect of mining will be conducive to the stability of the slope, stability coefficient increases. Mining area is located in the slope of the area, mining impact on slope stability based mainly affect the direction opposite sides section, the specific impact of the size of the project requires a combination of actual calculation.2) On the basis of the tensile strength of rock mass, according to the evolution attribute of the stress field in the process of the overlying rock mass movement and deformation that is because of the underground dynamic mining process, then defined the damage extent of the slope and the overlying rock mass under the different mining spatial dimensions.3) Based on the slip field theory and limit equilibrium method, the slope stability under the condition of open-pit and underground mining was evaluated in unstable state, and put forward the engineering control measures.4) The boundary area of the slope has been proposed the ecological restoration governance program that was the combination of Pinus massoniana and flood grass; in order to the mine is in the harmonious ecological environment.