黄土坡临江1号滑坡体滑带土残余强度试验研究  

Residual Strength Test of the Soil in Landslide Zone of Huangtupo Riverside Landslide Mass No.1

作　　者：张笛[1] 滕伟福[1] 安琪[1] ZHANG Di TENG Weifu AN Qi(Three Gorges Research Center for Geo-hazard , Ministry of Education, China University of Geosciences , Wuhan 430074, Chin)

机构地区：[1]中国地质大学(武汉)教育部长江三峡库区地质灾害研究中心,湖北武汉430074

出　　处：《安全与环境工程》2017年第2期39-45,共7页Safety and Environmental Engineering

摘　　要：以巴东黄土坡滑坡临江1号滑坡体滑带土为研究对象,使用环剪仪通过环剪试验研究了滑带土在不同剪切速率、滑带土含水率和法向应力情况下的残余强度特征。试验结果表明:剪切带厚度随着剪切速率的增加而逐渐增加;滑带土的残余强度和峰值强度随着剪切速率的增加均有所增加,且峰值强度增加得更为明显;剪切速率越大,滑带土达到残余强度值的时间越短,但所需的剪切位移则更大;剪切速率对滑带土的影响主要集中作用在降低土的内聚力上;滑带土内聚力随含水率的增加先递增后减,内摩擦角则不断减小;法向应力越大,滑带土峰值强度和残余强度越大。This paper investigates the residual strength characteristics of the slide zone soil of Huangtupo riverside landslide mass No.1in Badong under different shear rates,moisture content and effective normal stress by ring shear test.The results show that thickness of the shear band of the slide zone soil increases with the increasing of the shear rates;the residual strength and peak strength both increases with the increasing of the shear rates,while the latter does more significantly;the greater the shear rate,the shorter the time for the slide zone soil to reach the residual strength value,but the larger the shear displacement requires;the effect of shear rates on slip zone soil is mainly concentrated on reducing the cohesion of soil;the cohesion increases first and then decreases with the increase of water content while the internal friction angle is decreasing;the higher the normal stress,the greater the peak strength and residual strength of the slip zone soil.

关 键 词：环剪试验 残余强度 剪切速率 黄土坡临江1号滑坡 

分 类 号：X43[环境科学与工程—灾害防治] TU411[建筑科学—岩土工程]