Numerical Simulation of Slope Stability during Underground Excavation Using the Lagrange Element Strength Reduction Method

In this study, the Lagrange element strength reduction method is used to explore slope stability and as an evaluation of underground mining end-slope coal in a rock-stability analysis. A numerical analysis model established herein using geological conditions for coordinated open pit with area Anjialing Open-Pit Mine Underground No. 2 Mine. Additionally, evolution law open-pit studied proposed simulation method. According our findings, steps show obvious horizontal movement deformation under influence disturbances. Taking displacement at tops index, entire disturbed divided into four regions: upper, middle-upper, middle-lower, lower steps. When step fully affected by mining, its subsidence value first increases rapidly then slowly. An exponential function reflect change rule step-subsidence working face advances. process, critical sliding surface develops along soft rock or seam, showing L-shaped W (double L)-shaped broken line. As advances, initial position mass unchanged while cutting alternately changes up down weak plane. The safety factor suddenly drops when advancing distance exceeds certain value.