基于含水率的重塑低液限黏土抗剪强度关系模型试验  

Experiment on shear strength relation model of remolded low liquid limit clay based on water content

作　　者：唐凛 杨晓松 查旭东[2] 周光宇 赵宇[3] 江磊 TANG Lin;YANG Xiao-song;ZHA Xu-dong;ZHOU Guang-yu;ZHAO Yu;JIANG Lei(Maintenance Management Department,Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China;School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Anhui Transport Consulting&Design Institute Co.,Ltd.,Hefei 230088,China)

机构地区：[1]安徽省交通控股集团有限公司养护管理部,安徽合肥230088 [2]长沙理工大学交通运输工程学院,湖南长沙410114 [3]安徽省交通规划设计研究总院股份有限公司,安徽合肥230088

出　　处：《长沙理工大学学报（自然科学版）》2021年第2期26-32,共7页Journal of Changsha University of Science and Technology:Natural Science

基　　金：安徽省交通运输科技进步计划项目(201839);安徽省交通控股集团有限公司科技项目(AHJK-养-2019-0001);国家自然科学基金资助项目(51878077)。

摘　　要：为了探究含水率对路基填料抗剪性能的影响,以安徽省境内大别山区G35济广高速公路岳潜段典型重塑低液限黏土填料为研究对象,采用室内直剪试验分析了不同含水率和干密度条件下该土样抗剪强度及强度参数的变化规律。试验结果表明:含水率的增大可减小该土样的抗剪强度、黏聚力和内摩擦角,且含水率对黏聚力的影响明显大于其对内摩擦角的影响。回归分析表明:不同干密度下内摩擦角与含水率之间呈线性负相关关系,而黏聚力与含水率之间呈自然指数函数负相关关系,同时两组关系模型的回归参数与干密度之间也呈显著的线性相关性,由此获得以含水率、干密度和垂直压力表征的摩尔—库伦抗剪强度关系模型。经验证该模型预测精度较高,可为降雨入渗对该地区营运路堤边坡稳定性的影响分析提供抗剪强度参数衰变模型。In order to explore the influence of water content on the shear behavior of subgrade filler,the typical filler of remolded low liquid limit clay was taken as the research object,which was obtained from Yue-Qian Section of G35 Ji-Guang Expressway in Dabie Mountain Area of Anhui Province.The direct shear test in laboratory was carried out to analyze the change laws of shear strengths and strength parameters of the soil samples with different water content and dry densities.The test results show that the increase of water content can reduce the shear strengths,cohesion force and internal friction angles of the soil samples,and the influence of water content on the cohesion force is obviously greater than that on the internal friction angles.The regression analysis indicates that there is a linear negative correlation between internal friction angles and water content with different dry densities,while the negative correlation between cohesion force and water content is a natural exponential function.Meanwhile,there are also significant linear correlations between the regression parameters and the dry densities in the two groups of relation models.Thus,the relation model of Mohr-Coulomb shear strength was obtained expressed by water content,dry density and vertical pressure.It is verified that the model has high prediction a ccuracy,and it can provide the decay model of shear strength parameters for the influence a nalysis of rainfall infiltration on slope stability of operating embankment in the area.

关 键 词：低液限黏土 直剪试验 含水率 抗剪强度 黏聚力 内摩擦角 关系模型 

分 类 号：U416.12[交通运输工程—道路与铁道工程]