不同含水率高填方黄土抗剪强度试验研究  

Experimental Study on Shear Strength of High Fill Loess under Different Moisture Content

作　　者：王弘起 孙杰龙 李大卫 杨红霞[2] 宋涛 Wang Hongqi;Sun Jielong;Li Dawei;Yang Hongxia;Song Tao(SCEGC No.13 Construction Engineering Group Company Ltd.,Yan’an 716000,Shaanxi,China;School of Architecture and Civil Engineering,Yan’an University,Yan’an 716000,Shaanxi,China)

机构地区：[1]陕西建工第十三建设有限公司,陕西延安716000 [2]延安大学建筑工程学院,陕西延安716000

出　　处：《岩土工程技术》2022年第6期507-510,共4页Geotechnical Engineering Technique

基　　金：陕西省自然科学基础研究计划(2019JQ-832);陕西省教育厅一般专项科学研究计划(20JK0985);延安大学博士科研启动项目(YDBK2018-25)。

摘　　要：抗剪强度是分析高填方黄土边坡稳定性问题的重要参数,为探究含水率对高填方黄土抗剪强度的影响,开展不同含水率(2%、4%、6%、10%、12%、15%、20%、25%)高填方黄土抗剪强度试验。结果表明:含水率在2%~25%时,高填方黄土的抗剪强度随含水率的变化呈现先增大而后减小变化规律,并在含水率为15%时达到峰值;高填方黄土的内摩擦角和黏聚力会随含水率的增大呈现先增大后减小的变化趋势,且含水率对黏聚力影响较大;随着含水率增大,剪切位移与剪应力曲线斜率逐渐增大,其中含水率为12%和15%时,剪切位移和剪应力基本呈线性关系。研究可为高填方黄土边坡稳定性评价提供参考。Shear strength of high fill loess is an important parameter to analyze the stability of high fill loess slope.To study the influence of moisture content on the shear strength of high fill loess,the shear strength tests of high fill loess with different moisture content(2%,4%,6%,10%,12%,15%,20%,25%)were carried out,respectively.The experimental results show that when the moisture content is in the range of 2%~25%,the shear strength of high-filled loess increases first and then decreases with the change of moisture content,and reaches the peak when the moisture content is 15%;with the increase of moisture content,the internal friction angle and cohesion of the high-filled loess firstly increase and then decrease,and the moisture content has a great effect on the cohesion;the slope of shear displacement and shear stress curve increases gradually,when moisture content is 12%and 15%,and the relationship between shear displacement and shear stress is basically linear.The experimental results have certain reference value for the stability evaluation of high fill loess slope.

关 键 词：高填方 黄土 含水率 抗剪强度 

分 类 号：TU411.7[建筑科学—岩土工程]