摘要
由于降雨诱发,云南哀牢山地区浅层滑坡时有发生。本文通过获取该区某一滑体上部与滑带处残-坡积土试样,利用KTG全自动三轴剪切仪,在剪切速率为0.5%/min条件下对残-坡积土应力-应变关系、强度随含水率的变化规律进行了试验研究,对试验结果的分析表明:滑体土与滑带土的应力-应变关系在塑限含水率之前呈加工软化的形态,而在塑限含水率之后呈加工硬化的形态。两种土的强度参数随含水率的增大而衰减,但是滑体土强度参数衰减速度较快。内聚力与内摩擦角随含水率变化规律,较好地符合指数函数关系和线性关系。
As a result of rainfall,shallow landslides occur from time to time at Ailaoshan areas.In this paper,the stress-strain relationships and the strength parameters of the soil on the change in moisture content at shear rate of 0.5% /min are studied by gaining the soil from the upper infiltration area and sliding zone of one slip and taking advantage of the automatic KTG triaxial shear device.The experimental results show that the stress-strain relationships of landslide and sliding zone soil appear processing softening pattern before the plastic limit moisture content,but after the plastic limit moisture content the stressstrain relationships appear processing hardening pattern.The strength of the two soils is decreasing with moisture content increasing.But the speed of sliding body soil decay faster than the speed of sliding zone soil.The changes of cohesion and internal friction angle are respectively consistent with an exponential and linear relation.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2010年第4期77-80,共4页
Hydrogeology & Engineering Geology
基金
国家科技支撑计划项目资助(2006BAC04B01-04)
关键词
滑坡
残-坡积土
三轴试验
含水率
强度与变形
landslide
residual-slope soil
triaxial tests
water content
strength and deformation
