库水位升降过程中土质岸坡地下水变化试验分析  

Groundwater Variation of Soil Banks in Fluctuation of Reservoir Water Level

作　　者：向杰[1] 唐红梅[1] 陈鑫[1] 梁学站 赵先涛[1] 

机构地区：[1]重庆交通大学岩土工程研究所,重庆400074

出　　处：《重庆交通大学学报（自然科学版）》2014年第3期79-85,共7页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(41071017);重庆交通大学研究生教育创新基金项目(20120112)

摘　　要：以神女溪青石滑坡为原型,以三峡水库库水位升降变化为工况,依据相似理论建立土质库岸模型;通过试验获取土体的物性参数、坡体内孔隙水压力数据和坡体裂缝情况;采用包辛涅斯克(Boussinesq)非稳定渗流微分方程,求解出模型试验工况下的地下水位浸润线位置。研究表明:水位上升阶段,通过各高程孔隙水压力曲线及求出的坡体内浸润线,孔隙水压力的升高是坡体形成裂缝的催化剂;水位降落阶段,根据各高程孔隙水压力曲线以及浸润线分析得到动水压力是影响其稳定性的关键因素。Taking bluestone landslide of Shennvxi River as a prototype,and taking Three Gorges reservoir water level variation as the condition,soil reservoir bank model was established by similarity theory. The soil physical parameters,the pore water pressure data and slope crack condition were obtained by the experiment. The groundwater seepage line position in model condition was calculated with the adoption of Boussinesq unsteady seepage differential equation. The research results show that in the rising stage of water level,the increasing of pore water pressure is the activator of slope cracking,by the pore water pressure curve with different elevation and the calculated slope seepage line. In the drawdown stage of water level,mobilized water pressure is the key factor to affect the bank stability by the analysis on the pore water pressure curve with different elevation and the calculated slope seepage line.

关 键 词：工程地质学 孔隙水压力 坡体裂缝 浸润线 稳定性 

分 类 号：P642.22[天文地球—工程地质学]