泄洪雾化降雨对上田滑坡体的渗流影响及稳定性分析

以上田滑坡体A区中线为计算剖面,基于二维饱和—非饱和渗流有限元方法,分析了滑坡在泄洪雾化状态下的渗流场,获得在6 000m3/s泄洪强度下压力水头及地下水位变化情况。结果表明,随着降雨持时的增加,压力水头随深度呈近直线变化趋势;降雨渗水在一定土层条件下使地下水渗流产生"瓶颈"效应,形成对边坡稳定不利的暂态饱和区;地下水位总体呈现从坡脚和中部部位同时提升的现象;暂态饱和区使安全系数明显降低,但滑坡稳定性良好,不存在失稳风险。

Seepage and Stability Analysis of Atomized Rain of Shangtian Landslide

Choosing the middle line of zone A of Shangtian landslide as the calculation section,based on two-dimensional saturated-unsaturated seepage FEM theory,seepage field of landslide is analyzed in conditions of spilling atomization.And then in conditions of flood discharge intensity of 6 000 m3/s,the variation rules of pressure head and underground water level are obtained.The results show that with the increase of rainfall duration,the pressure head is linear with depth approximately;the "bottleneck" effect of underground water appears under the specify condition of soil during the atomized rainfall and the transient saturated zone is sensitive to the stability of landslide;underground water level raised from the toe and middle of rainfall zone;the factor of safety decreased under the condition of transient saturated zone while the whole stability of landslide is well and there is not failure risk.