不同含水率下滑坡滑带土动力特性试验研究

发布时间：2018-06-05 00:52

本文选题：泄流坡 + 滑带土　；参考：《地震工程学报》2017年04期

【摘要】：甘肃舟曲泄流坡滑坡地处活跃断层破裂带内,断层活动控制着该滑坡的发育和运动。为了研究该滑坡滑带土的动力特性,采用重塑滑带土样,在固结不排水条件下,利用分级循环加载法开展动三轴试验,重点探讨含水率的变化对滑带土动力特性的影响规律。试验结果表明:含水率一定时,泄流坡滑坡滑带土的动弹性模量随动应变的增大呈指数形式减小;动应变一定时,动弹性模量随含水率的增大而不断减小,且衰减速率随含水率的增大而增大;含水率并不影响动弹性模量-动应变关系曲线的形态,不同含水率下该关系曲线可以进行归一化。滑带土阻尼比随含水率的增大而增大,阻尼比-动应变关系曲线也具有归一化特征。不同含水率下泄流坡滑带土动应力-应变本构关系可以用双曲线模型进行描述。
[Abstract]:The Zhouqu leachate slope landslide is located in the active fault fracture zone, and the fault activity controls the development and movement of the landslide. In order to study the dynamic characteristics of the landslide sliding zone soil, the dynamic triaxial test was carried out under the condition of consolidation and undrained by using the step cyclic loading method, and the influence of the water content on the dynamic characteristics of the sliding zone soil was discussed. The experimental results show that when the moisture content is constant, the dynamic elastic modulus of leachate slope slide zone decreases exponentially, and the dynamic elastic modulus decreases with the increase of moisture content. The attenuation rate increases with the increase of moisture content, and the shape of dynamic elastic modulus-dynamic strain curve is not affected by water content, which can be normalized under different water content. The damping ratio of sliding zone soil increases with the increase of moisture content, and the curve between damping ratio and dynamic strain is normalized. The dynamic stress-strain constitutive relation of the soil in slip zone of leachate slope under different water content can be described by hyperbolic model.
【作者单位】：西部灾害与环境力学教育部重点实验室;兰州大学土木工程与力学学院;甘肃省科学院地质自然灾害防治研究所;
【基金】：国家重点基础研究发展计划(973计划)(2014CB744701) 国家自然科学基金地区科学基金项目(41362014)
【分类号】：P642.22

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