摘要
膨胀土是一种遇水膨胀,失水收缩的特殊岩土,水对其力学特性影响显著。以南水北调工程中线河南境内某膨胀岩渠坡为例,考虑渗流场与应力场的双向耦合作用,采用有限元强度折减法,研究降雨入渗对膨胀土渠坡的抗滑稳定性影响。计算表明,随着降雨强度和降雨历时的增加,渠坡抗滑稳定安全系数所有减小。考虑降雨入渗对膨胀土抗剪强度的影响后,渠坡安全系数显著下降。
Expansive soil is a kind of special geotechnical material that expands with water increasing and shrinks with water loosing,and water has a significant effect on its mechanical properties.Taking an expansive soil slope in Henan province of the middle route of South-to-North Water Diversion Project as an example,considering the double coupling effect between seepage field and stress field,this paper studies the influence of rainfall infiltration on the anti-sliding stability of expansive soil slope by finite element strength reduction method.The calculation shows that with the increase of rainfall intensity and duration,the safety factor of anti-sliding stability of slope decreases.Upon considering the influence of rainfall infiltration on the shear strength of expansive soil,the safety factor of slope decreases significantly.
作者
岑威钧
王永立
石从浩
袁丽娜
CEN Weijun;WANG Yongli;SHI Conghao;YUAN Lina(College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing 210098,China;Guizhou Survey&Design Research Institute for Water Resources and Hydropower,Guiyang 550002,China)
出处
《人民珠江》
2020年第7期114-117,共4页
Pearl River
关键词
膨胀土
降雨入渗
渠坡稳定性
渗流应力耦合
expansive soil
rain infiltration
slope stability
coupling effect between seepage field and stress field
