工程地质学报2016，Vol.24Issue(1)：109-115,7.DOI:10.13544/j.cnki.jeg.2016.01.014
黏粒含量对磁县段膨胀土抗剪强度影响的试验研究
EXPERIMENTAL STUDY ON EFFECT OF CLAY CONTENT ON SHEAR STRENGTH OF EXPANSIVE SOIL AT CI COUNTY
摘要
Abstract
In order to study the effect of clay content on the shear strength of expansive soil,this paper conducts quick shear,saturated quick shear,saturated consolidated quick shear and repeated direct shear tests with electric strain controlled direct shear apparatus,residual shear test,and direct shear/residual shear test apparatus on the undisturbed expansive soils at Ci County Hebei of South-to-North Water Diversion.The soils have different clay contents.Studies show that:in the direct shear test,the shear strength of the expansive soil significantly reduces after the soil is saturated,and increases after it is consolidated.The effect of saturation on the strength of the expansive soil of larger clay content is more significant.The "cure"effect of consolidation on the strength of weak expansive soil of lesser clay content is more significant.As the clay content increases,the cohesion gradually decreases,and internal friction angle first decreases and then increases.The critical value is about 32%.In the repeated direct shear test,the shear strength after peak intensity increases as the clay content increases.The change trend is relatively flat.The residual strength τr decreases exponentially as the clay content increases.While the internal friction angle φr of the residual strength has a logarithmic relation with clay content.The cohesion cr has an irregular relation with the clay content.关键词
原状膨胀土/反复直剪/黏粒含量/峰值强度/残余强度Key words
Natural expansive soils/Repeated direct shear/Clay content/Peak intensity/Residual strength分类
建筑与水利引用本文复制引用
张晓丽,周进,黄志全,王伟,张瑞旗..黏粒含量对磁县段膨胀土抗剪强度影响的试验研究[J].工程地质学报,2016,24(1):109-115,7.基金项目
河南省科技创新人才计划(154100510006),河南省重点科技攻关项目(152102210111),新疆维吾尔自治区科技援疆(201491105),华北水利水电大学研究生教育创新计划基金(YK2014-10)资助. （154100510006）
