强降雨入渗下复杂地形排土场稳定性分析

Stability analysis of waste dump with complex terrain under heavy rainfall infiltration

针对某矿复杂地形排土场在降雨作用下可能诱发灾害的问题,设计了4种百年一遇强降雨类型。借助ANSYS建模功能,生成排土场复杂的计算模型;利用FLAC3D流固耦合模块,分别将4种强降雨类型施加在排土场上。以塑形变形区是否贯通以及特征部位位移是否发生突增来判断排土场是否发生破坏。结果表明,若出现强度在5 mm/h以上且持续时间超过40 min的降雨,排土场将有滑坡危险。分析结果为矿山做好险情预防工作提供理论和技术支持。

In view of the problem that it will induce disasters if heavy rainfall influences the waste dump with complex terrain in a mine, four kinds of heavy rainfalls with return period of 100 years are designed. With the help of modeling function of ANSYS, a complex model for the dump is established. Utilizing the fluid-solid coupling module of FLAC3D, four kinds of heavy rainfalls are imposed on the dump, respectively. It uses two criteria, whether plastic deformation area cuts through the dump and whether displacement value of representative position uprushs, to judge whether or not failure of the dump occurs. The results show that, the waste dump will slide in the case of rainfall if its intensity is larger than 5 mm/h and its duration is longer than 40 minutes. This study may provide theoretical and technical support for the mine to prepare for risk prevention.