黄土地基增湿自重湿陷变形特性的离心模型试验  

Research on self- weight moistening collapsible deformation characteristics of loess foundation by centrifuge model test

作　　者：金松丽[1] 邢义川[1] 赵卫全[1] 安鹏[2] 闫浩[3] 

机构地区：[1]中国水利水电科学研究院,北京100048 [2]长安大学地质工程与测绘学院,陕西西安710064 [3]北京矿务局综合地质工程公司,北京102300

出　　处：《人民长江》2016年第9期90-94,共5页Yangtze River

基　　金：国家自然科学基金项目"基于‘可能湿陷变形’的黄土渠道地基湿陷性评价方法研究"(51379220);国家自然科学基金项目"依据原位试验反演土体本构模型参数的方法研究"(51209234)

摘　　要：针对新疆伊犁地区某引水渠基工程,采用黄土湿陷变形计算的双线法,开展了黄土地基增湿自重湿陷变形特性的离心模拟研究。试验研究表明,黄土地基的增湿自重湿陷变形是地基饱和度及厚度的二元函数,增湿湿陷变形随着地基厚度和饱和度的增加呈增大趋势,在增湿湿陷变形-地基厚度-饱和度三维空间中形成一个双曲抛物面,称之为地基增湿自重湿陷变形面。通过将离心模型试验结果与现场浸水试验数据进行对比,验证了地基增湿自重湿陷变形面的合理性,同时也证明了基于双线法采用离心模型试验研究黄土地基湿陷变形特性的可行性。The double- line method has been used to study the self- weight moistening collapsible deformation characteristics of a loess foundation of water diversion channel,Yili region of Xinjiang,by a centrifugal model test. The experimental research shows that the self- weight moistening collapsible deformation of loess foundation is a binary increasing functions about the soil saturation degree and the foundation thickness,and the function forms a hyperbolic paraboloid called surface of self- weight moistening collapsible deformation,in 3D space of the moistening collapsible deformation- foundation thickness- soil saturation degree. Then through the comparison of the result obtained in the centrifugal model test with the data from the in- situ water immersion test,the reasonability of the moistening deformation surface has been proved,and the feasibility of the centrifugal model test in study of the collapsible deformation characteristics of loess foundation is verified as well.

关 键 词：增湿湿陷 双线法 离心模型试验 黄土地基 

分 类 号：P642[天文地球—工程地质学]