边坡动力破坏特征的振动台模型试验与数值分析  

Shaking table model test and numerical analysis on dynamic failure characteristics of slope

作　　者：叶海林[1,2] 郑颖人[1] 杜修力[3] 李安洪[4] 

机构地区：[1]后勤工程学院,重庆400041 [2]总装备部工程设计研究总院,北京100028 [3]北京工业大学,北京100124 [4]中铁二院工程集团有限责任公司,四川成都610031

出　　处：《土木工程学报》2012年第9期128-135,共8页China Civil Engineering Journal

基　　金：科技部973项目"重大工程灾变滑坡演化与控制的基础研究(2011CB710600)";重庆市自然科学基金项目"地震作用下边坡稳定性新方法及支护结构的抗震性能研究";"十一五"国家科技支撑计划"山区村镇地质灾害防治技术研发(2006BAJ05A02)"

摘　　要：采用大型振动台模型试验,输入幅值逐级增大的地震波,直到边坡破坏,得到边坡动力破坏特征:上部拉裂缝和下部剪切滑移面形成贯通的破裂面,滑体上监测点位移和加速度响应突变,表明边坡已经发生破坏,且坡顶局部块体在地震作用下发生抛射现象。采用FLAC动力差分软件通过逐渐加大输入地震波幅值,模拟模型边坡振动台试验过程,证实拉裂缝与剪切滑移面贯通是边坡动力破坏的必要条件,位移和加速度响应突变可以作为边坡动力破坏的判据。振动台试验和数值计算在边坡动力破坏三个特征上吻合较好,证明振动台模型试验结果的合理性,也证明数值分析方法的可靠性。By inputting the seismic wave with step-by-step increased amplitude until the slope fails, large-scale shaking table model tests were carried out to study the dynamic failure characteristics of slope. It is found the upper tension crack connected with the lower shear sliding surface runs through the slope, while the displacement and acceleration response at monitoring points mutate, indicating that the slope failure may occur. In addition, block masses at some parts of slope crest may be thrown due to the earthquake shock. By gradually increasing the input amplitude of seismic wave using the dynamic differential software FLAC, the slope model was simulated on the shaking table. It was approved that the tension crack connected with the shear sliding surface running through the entire slope is a necessary condition of slope dynamic failure and the mutation of displacement and acceleration response may be regarded as the criterion of estimating slope dynamic failure. As to the three characteristics of the slope dynamic failure, the shaking table model test conforms well to the numerical simulations, validating that the results of shaking table model test are reasonable and the numerical simulation method is reliable.

关 键 词：边坡工程 地震 动力破坏特征 振动台试验 加速度响应 

分 类 号：TU435[建筑科学—岩土工程]