采动作用下黑岱沟露天矿区岩土边坡稳定性研究

Study on stability of rock and soil slope in Heidaigou open-pit mining area under mining action

为确保露天矿区施工安全,以提升岩土边坡稳定性为目的,提出采动作用下露天矿区岩土边坡稳定性研究。以某矿区现场岩土边坡为研究对象,基于有限元强度折减理论折减露天矿区岩土边坡的抗剪参数,得到抵达边坡极限平衡的折减数为稳定性系数,实现露天矿区岩土边坡稳定性分析。试验结果表明,该技术可有效分析露天矿区岩土边坡的稳定性,岩土边坡单元在6 s之后的剪切应变量显著提升,坡脚砂岩的剪切应变量增速最高、在6~10 s的强采动阶段位移变化增速较快,边坡在滑面上与起点的水平距离为96 m之后的正、剪应力在滑面上急剧增大,安全系数也随之提升,坡脚倾斜度、降雨以及降雨强度均会影响露天矿区岩土边坡的稳定性。

In order to ensure the construction safety of open-pit mining area and improve the stability of rock and soil slope,a study on the stability of rock and soil slope in open-pit mining area under mining action was put forward.Taking the rock and soil slope in a mining area as the research object,based on the finite element Strength reduction theory,the shear parameters of the rock and soil slope in the open-pit mining area were reduced,and the reduction value reaching the limit equilibrium of the slope was obtained as the stability coefficient,thus realizing the stability analysis of the rock and soil slope in the open-pit mining area.The test results show that this technology can effectively analyze the stability of rock and soil slopes in open-pit mining areas.The shear strain of rock and soil slope units increases significantly after 6 s,the shear strain of sandstone at the foot of slope increases at the highest rate,the displacement changes rapidly during the strong mining stage of 6~10 s,and the positive and shear stresses on the sliding surface increase sharply after a horizontal distance of 96 m from the starting point.The safety factor also increases,and the slope inclination,rainfall and rainfall intensity will all affect the stability of rock and soil slopes in open-pit mining areas.