Numerical Simulation Of Slope Under Different Exploitation Condition

Failure of slope, can easily result in the occurrence of landslides, avalanches, or slope debris flow. To some extent, the occurrence of geological disasters has some abruptness, there is a great threat to the people and the property around. Among the many factors influencing the stability of slope, the underlying coal excavation, has a great impact on slope stability.Taking Nancun slope in Gujiao as the research object, midas gts-a software of finite element analysis-was used for the modeling of the slope based on the actual geological environment and underground mining conditions to analysis the stress, displacement and plastic deformation of the slope. The results showed that, the slope was stable before mine exploitation. The presence of underlying mining area resulted in the occurrence of plastic deformation from upper to middle of the slope, which would lead in slope failure on the small-scale. In addition, the results of the numerical simulation showed that, the slope stability was mainly affected by the gob1(which emerged earlier), the influence of the gob2(which emerged later) was not obvious.Meanwhile, in order to further study the impact of different mining conditions on slope stability, the paper assumed two different mining conditions, including different mining sequence, and different location in the slope. In the numerical simulation, by comparing the stress, strain and factor of stability of the slope, the results are as followings:1. Different mining sequence had a different effect on the slope deformation and failure. At first, it would lead to different stress distribution in the slope, ultimately resulting in different displacement. Analyzing the displacement and plastic strain, it showed that when the coal was mined at the same time, the impact on slope stability was the greatest; when the coal was mined in the direction close to the slope surface, the impact on slope stability was the least. The results of the numerical simulation showed that, when the coal was mined in the direction away from the slope surface or mining every other strip, the impact on the slope is different, but the difference was not significant.2. When the underlying Gob was in different locations of the slope, the damage extent of the slope was different. When the mined-out area was located in the posterior segment of the slope, the damage extent was the largest, plastic deformation occurred from top to toe through the slope, the slope was unstable, When the mined-out area was located in the center of the slope, plastic deformation occurred from upper to middle of the slope, the damage extent was the second largest, the slope would make deformation; When the mined-out area was located in the toe or in the back of the slope, the impact on stability of the slope was small or there is no impact on the slope stability.