抗滑桩加固黏性土坡变形规律的离心模型试验研究  

Centrifuge modeling of cohesive soil slopes reinforced by stabilizing piles

作　　者：王丽萍[1] 张嘎[1] 张建民[1] 李焯芬[1] 

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《岩土工程学报》2009年第7期1075-1081,共7页Chinese Journal of Geotechnical Engineering

基　　金："973"课题(2007CB714108);国家自然科学基金项目(50778105)

摘　　要：采用土工离心机及专用振动台,进行了静动力加载条件下抗滑桩加固黏性土坡的离心模型试验。测量了试验过程中边坡的位移场和加速度响应的变化过程以及抗滑桩的位移和应变分布。试验结果表明地震过程中土坡的加速度响应自下而上逐渐增大,震后残余变形的水平分量最值相比震前向坡上部移动。静动力加载过程中,抗滑桩内侧土体存在一个面,其内外两侧的土体位移表现出不同的水平位移变化规律,从而可以将抗滑桩加固土坡划分成4个分别具有不同变形特性的区域;同一高程处桩的水平位移大于内侧土体而小于外侧土体;抗滑桩与土发生较复杂的相互作用,并使得土坡的变形趋于均匀。The behaviors of cohesive soil slopes reinforced by stabilizing piles are investigated using centrifuge model tests. The static and dynamic loading conditions are considered in the tests using the geotechnical centrifuge machine with the shaking table. The response of the slope-pile system is measured during testing, including the histories of displacement and acceleration of the slope, and the displacement and strain distribution of the stabilizing piles. The results show that the acceleration response of the slope increases gradually with the increasing altitudes during the earthquake. There is a surface on the inner side of the piles in the slope during the static and dynamic loading, indicating a boundary of different change rules of horizontal displacement. Therefore, the pile-reinforced slope can be divided into four zones with different deformation behaviors. The horizontal displacement of the pile is larger than that of the inner soil and less than that of the outer soil. The piles exhibit a complex interaction with the slope, resulting in a more uniform deformation.

关 键 词：边坡 黏性土 抗滑桩 离心模型试验 土-结构相互作用 

分 类 号：TU41[建筑科学—岩土工程]