含水率影响下粉质黏土边坡失稳预警研究  

Study on Early Warning of Instability of Silty Clay Slope under the Influence of Water Content

作　　者：马娇 路博 赵文[1] 金陈 MA Jiao;LU Bo;ZHAO Wen;JIN Chen(School of Resources and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院,沈阳110819

出　　处：《路基工程》2021年第5期75-80,共6页Subgrade Engineering

基　　金：国家自然科学基金面上项目(51578116,51878127)。

摘　　要：采用直接剪切试验和强度折减法,得出边坡安全系数与土体含水率的关系;通过三相并联电阻率模型和欧姆定律,推导出土体在环形电极下电流与含水率的关系;提出基于电流法的边坡失稳预警模型,并通过室内试验对该模型进行验证。试验结果表明:边坡土体的稳定性和导电性均与含水率有关。当含水率大于23.5%,安全系数小于1.25时,试验值和理论值基本吻合,误差不超过5.0%。In this paper,through direct shear test and strength reduction method,the relationship between slope safety factor and soil moisture content is obtained.And through the three-phase parallel resistivity model and Ohm's law,the relationship between the current and the water content of the soil under the ring electrode is derived,then a slope instability early warning model based on current method is proposed,and verify the model through indoor tests.The results of the reseach showed that the stability and conductivity of the slope soil are related to the moisture content.When the water content is more than 23.5%and the factor of safety is less than 1.25,the test value and the theoretical value are basically consistent,and the error is less than 5.0%.

关 键 词：黏土边坡 失稳预警模型 土体含水率 电流 强度折减法 

分 类 号：U213.13[交通运输工程—道路与铁道工程]