长江科学院院报2018，Vol.35Issue(4)：123-128,6.DOI:10.11988/ckyyb.20161267
凹陷地形对滑坡体渗流和稳定性影响的数值分析
Influence of Topographic Hollows on Seepage and Stability of Landslides: Numerical Simulation
摘要
Abstract
Through field investigation and lab analysis,computation models of landslides with topographic hollows in Ziyang county of the Qinling-Daba Mountains were set up based on unsaturated soil mechanics theory.The stability and seepage with saturated and unsaturated properties under transient conditions were computed by limit equilibrium method in consideration of pore water pressure and unsaturated strength.Results show that topographic hollows induce slope failure through convergence of subsurface flow into small areas in the slope.Per unit depth of the maximum pore water pressure measured in an area close to the base of topographic hollows was found to be higher with bigger topographic hollows.Furthermore,a threshold relationship between the topographic hollow area and maximum pore water pressure in this study indicates that a topographic hollow of 1 000 m2 area could generate a maximum pore water pressure of 1.47 kPa.关键词
浅层滑坡/凹陷地形/秦巴山区/孔隙水压力/安全系数Key words
shallow landslides/topographic hollows/Qinling and Daba Mountains/pore water pressure/factor of safety分类
天文与地球科学引用本文复制引用
吕佼佼,范文,吕远强,李凯,杜谦..凹陷地形对滑坡体渗流和稳定性影响的数值分析[J].长江科学院院报,2018,35(4):123-128,6.基金项目
国家自然科学基金项目(41272282) （41272282）
中国地质调查局地质调查工作项目(1212011220135) （1212011220135）
