强降雨下的高边坡稳定性数值模拟研究

Numerical Simulation of High Slope Stability under Heavy Rainfall

高边坡的稳定性问题一直都是边坡工程中极为重要的一环。使用FLAC3D软件对某矿区边坡进行建模分析,研究在强降雨条件下的高边坡稳定性问题。结果表明,强降雨作用下的边坡坡底较为危险,暂饱和状态最先在坡底出现,且随着降雨时长增加,坡面形成径流,雨水汇集坡底,使坡底剪应力较大,剪应力变化率也较其他部位大,较容易由坡底剪出并发生剪切破坏,出现滑坡等地质灾害;边坡在短时强降雨下,稳定性变化不大,长时间强降雨会明显损耗坡体的稳定性,从而增大滑坡的风险;边坡在强降雨下的稳定性还与坡面出露的岩石岩性有关,若出露的岩石防水性与抗风化能力较强,可有效增强边坡的稳定性。

The stability of high slopes has always been an extremely important part of slope engineering.This paper uses FLAC3D software to model and analyze the slope of a mining area,and study the stability of high slopes under heavy rainfall conditions.The results show that the bottom of the slope under the action of heavy rainfall is more dangerous.The temporary saturation state first appears at the bottom of the slope.As the rainfall time increases,runoff is formed on the slope.The shear stress change rate is also larger than that of other parts,and it is easier to cut out from the bottom of the slope and cause shear failure,and geological disasters such as landslides occur;the stability of the slope under short-term heavy rainfall does not change much,but long-term heavy rainfall will be obvious Lose the stability of the slope,thereby increasing the risk of landslides;the stability of the slope under heavy rainfall is also related to the lithology of the exposed rock on the slope.If the exposed rock has strong water resistance and weathering resistance,it can be effectively enhance the stability of the slope.