封闭条件下粉质黏土冻融交界面抗剪强度研究  

Experimental study on shear strength of froze-thaw interface of silty clay under closed condition

作　　者：汪恩良 肖尧 许春光 田雨 WANG Enliang;XIAO Yao;XU Chunguang;TIAN Yu(School of Water Conservancy and Civil Engineering,Northeast Agricultural University,Harbin 150030,China)

机构地区：[1]东北农业大学水利与土木工程学院,哈尔滨150030

出　　处：《东北农业大学学报》2020年第3期61-70,共10页Journal of Northeast Agricultural University

基　　金：国家自然科学基金项目(51541901);“十三五”国家重点研发计划项目(2018YFC0407301)。

摘　　要：封闭条件下,对重塑粉质黏土试样作冻融处理。在试样融化过程中将冻融交界面融化到指定位置,以快剪试验研究冻融交界面处土体抗剪强度参数粘聚力c、内摩擦角φ数值变化,冻融交界面附近土层含水率及冻融交界面处抗剪强度参数与界面附近水分变化关系。结果表明,冻融界面土体粘聚力和内摩擦角总体均随界面含水率增大而减小,粘聚力受含水率影响较大,其中初始含水率为24%试样降幅最大,达10.79%;而内摩擦角影响较小。界面附近含水率增加,增幅随试样初始含水率增大而增大。Under the closed condition,the remolded silty clay samples were freeze-thawed.The interface of freeze-thaw was melted to the designated position during the melting process of the sample,and the fast shear test was carried out to study the numerical changes of the shear strength parameters cohesion c and internal friction angle φ of the soil at the interface of freeze-thaw.The change of soil moisture content near the interface of freeze-thaw was studied,and the relationship between the change of shear strength parameters and the change of water content near the interface was studied.The results showed that the cohesion and internal friction angle decreased with the increase of the water content of the interface,and the cohesion was greatly affected by the water content,in which the sample with the initial water content of 24%decreased the most,reaching 10.79%,while the internal friction angle had little influence.The increase of water content near the interface increases with the increase of initial water content.

关 键 词：粉质黏土 冻融交界面 快剪试验 抗剪强度 含水率变化 

分 类 号：TU411.7[建筑科学—岩土工程]