工程科学学报2016，Vol.38Issue(9)：1204-1211,8.DOI:10.13374/j.issn2095-9389.2016.09.002
持续暴雨作用下排土场层状碎石土边坡稳定性
Layered gravel soil slope stability of a waste dump considering long-term hard rain
摘要
Abstract
In order to examine the effect of long-term hard rain on the layered gravel soil slope stability of a waste dump, the for-mula derivation relating natural water content, natural unit weight and natural volumetric water content was conducted to help to con-firm the initial suction of the slope rapidly. A numerical analysis model of a waste dump with a layered gravel soil slope based on the finite element method was established to analyze the saturated-unsaturated seepage, coupled stress-pore pressure and slope stability. The results show that a seepage channel will be formed in the slope surface due to its high permeability during the rain. If there exists a water-resisting soil layer in the bottom of the slope, water will come out from the slope toe. The displacement of the slope increases with a decreasing rate during the rain and decreases immediately after the rain. The stability coefficient of the slope decreases rapidly at the beginning of the rain. Then the stability coefficient barely changes till the rain stops as the seepage in the slope surface becomes stable. After the rain, the stability coefficient increases slowly. It is most possible for the layered gravel soil slope of a waste dump to fail in the middle and late stages of long-term hard rain.关键词
排土场/暴雨/渗流/吸力/稳定性分析Key words
waste dump/hard rain/seepage/suction/stability analysis分类
矿业与冶金引用本文复制引用
郑开欢,罗周全,罗成彦,文磊..持续暴雨作用下排土场层状碎石土边坡稳定性[J].工程科学学报,2016,38(9):1204-1211,8.基金项目
国家自然科学基金资助项目(51274250) （51274250）
