泄洪雾化降雨对上田滑坡体的渗流影响及稳定性分析  

Seepage and Stability Analysis of Atomized Rain of Shangtian Landslide

作　　者：权威[1] 张新乐[1] 曹海[1] 郭晓辉[1] 卫明山[1] 

机构地区：[1]总参工程兵科研三所,河南洛阳471023

出　　处：《水电能源科学》2012年第3期114-117,共4页Water Resources and Power

摘　　要：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。Choosing the middle line of zone A of Shangtian landslide as the calculation section, based on two-dimen- sional saturated-unsaturated seepage FEM theory, seepage field of landslide is analyzed in conditions of spilling atomiza-tion. And then in conditions of flood discharge intensity of 6 000 m^3/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 linearwith 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.

关 键 词：滑坡 泄洪雾化 饱和-非饱和渗流理论 渗流分析 稳定性分析 

分 类 号：TV139.14[水利工程—水力学及河流动力学] P642.22[天文地球—工程地质学]