中南大学学报（自然科学版）2018，Vol.49Issue(1)：238-246,9.DOI:10.11817/j.issn.1672-7207.2018.01.030
前期降雨对非饱和覆盖层边坡性状及稳定性的影响
Effect of antecedent rainfall on characteristics and stability of unsaturated overburden slope
摘要
Abstract
Based on the unsaturated seepage and unsaturated soil shear strength theory, the rainfall intensity was used as an variables. Numerical simulation of the volumetric water content changing process, effective stress field, displacement field and slope stability were studied in different conditions of antecedent rainfall intensity. The impact of the antecedent rainfall intensity on the properties and stability of unsaturated overburden slope was obtained. The results show that larger antecedent rainfall intensity leads to greater water content of the slope after the discriminate rainfall. The antecedent rainfall intensity plays a decisive role in the final water content of the slope. After the discriminate rainfall, the effective stress in the same position of the slope is inversely proportional to the intensity of the antecedent rainfall. The decrease of effective stress is small inside the slope but great at the bottom of the slope. The displacement at the bottom of slope is proportional to the rainfall intensity. After the discriminate rainfall, the slope safety factor decreases with the increase of antecedent rainfall intensity, the effect of rainfall on slope stability is mainly manifested as greater antecedent rainfall intensity leads to smaller initial safety factor of the slope.关键词
前期降雨/非饱和土/覆盖层边坡/边坡稳定性Key words
antecedent rainfall/unsaturated soil/overburden slope/slope stability分类
建筑与水利引用本文复制引用
曾铃,李光裕,史振宁,邱祥,卞汉兵,李董可..前期降雨对非饱和覆盖层边坡性状及稳定性的影响[J].中南大学学报（自然科学版）,2018,49(1):238-246,9.基金项目
国家自然科学基金资助项目(56178073, 51678074, 51508040, 51508079) （56178073, 51678074, 51508040, 51508079）
湖南省重点研发计划项目(2016SK2023) （2016SK2023）
湖南省教育厅优秀青年基金资助项目(17B013) (Projects(56178073, 51678074, 51508040, 51508079) supported by the National Natural Science Foundation of China （17B013）
Project(2016SK2023) supported by Key Research and Development Plan of Hunan Province, （2016SK2023）
Project(17B013) supported by Outstanding Youth Foundation of Education Department in Hunan Province) （17B013）
