水泥尾矿砂土的应力渗流耦合特性试验  

An experimental study of cemented-tailings under the stress-seepage coupling conditions

作　　者：宁宝宽[1] 王宇旸[1] 陈四利[1] 刘国庆[1] 

机构地区：[1]沈阳工业大学建筑工程学院,辽宁沈阳110870

出　　处：《水文地质工程地质》2015年第4期74-78,共5页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目(51279109);辽宁省教育厅科学研究计划资助(201364088)

摘　　要：基于工程环境中水泥土桩体经常处于各种荷载应力和地下水渗流等多因素耦合作用的复杂状态,采用三轴应力-应变-渗流试验系统,研究了不同水泥掺量的水泥尾矿砂土的渗流特性。结果显示:各种应力状态下水泥尾矿砂土的渗流特性均符合达西定律,且渗透系数随着水泥掺量的增加明显减小;在应力-渗流耦合作用下,水泥尾矿砂土的渗流特性随应力状态变化而改变,渗透系数随着轴向应力的增加先减小后增大,变化曲线呈U字型。水泥尾矿砂土的渗透特性变化与它的应力-应变特性具有一定的对应关系。Based on the complex stress state that cement-soil pile in engineering environment is always subjected to multiple factors such as load stress and groundwater seepage,the seepage characteristics of cemented-tailings with different cement mixing ratios are investigated by the triaxial stress-strain-seepage test system. The results show that all the seepage characteristics of cemented-tailings under various stress states are consistent with those of the Darcy law,and coefficient of permeability decreases obviously with the increasing cement mixing ratio. Under the stress-seepage coupling conditions,the seepage characteristics of cementedtailings change with the stress state,and the change curve of the coefficient of permeability takes on a U-type trend with the increasing axial stress, i. e., decreases first and then increases. There is a certain corresponding relation between the seepage characteristics change in cemented-tailings and its stress-strain characteristics.

关 键 词：水泥尾矿砂土 应力-渗流耦合 围压 渗透系数 

分 类 号：TU411.4[建筑科学—岩土工程]