直立式挡墙支护边坡的离心模型试验研究  

Centrifuge Modeling on the Slope Supported by Vertical Retaining Wall

作　　者：牟太平 罗方悦 肖红萍 邱志雄 张嘎[2] MU Tai-ping;LUO Fang-yue;XIAO Hong-ping;QIU Zhi-xiong;ZHANG Ga(Guangdong Provincial Freeway Co.Ltd.,Guangzhou 510623,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;Beijing Urban Underground Space Development and Investment Co.,Beijing 100044,China)

机构地区：[1]广东省高速公路有限公司,广州市510623 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京市100084 [3]北京城投地下空间开发建设有限公司,北京市100044

出　　处：《公路》2022年第9期9-14,共6页Highway

基　　金：国家自然科学基金重点项目,项目编号52039005。

摘　　要：采用离心模型试验研究了直立式挡墙支护边坡的变形特性,探究了支护土坡条件下直立式挡墙的位移与土压力特性,阐明了直立式挡墙对支护土坡变形特性的影响机制。结果表明,土坡支护条件下挡墙只发生远离土坡的水平向位移;当挡墙高度超过某个特征墙高后,挡墙的位移会迅速增加,挡墙不再保持稳定,将该特征墙高定义为“极限墙高”;不同挡墙高度时,土压力沿高程自上而下近线性增加;土坡主要发生竖向压缩变形,随挡墙高度增高其竖向位移接近线性增长,水平位移增长速率逐渐增大;挡墙高度对土坡位移的分布特性影响不大;土坡的竖向位移值自上而下逐渐减小,坡体深处水平位移指向坡内,坡体浅表部水平位移指向坡外;将发生指向坡外位移的区域定义为支护土坡的“易损区”,随着挡墙高度的增加,易损区不断向坡体内部扩展。In this paper,the centrifuge model test is carried out to study the deformation characteristics of the slope supported by vertical retaining wall.The responses of the vertical retaining wall and soil slope are observed,the features of the retaining wall displacement and the earth pressure are analyzed,and the retaining wall influencing mechanism on the slope deformation is illustrated.Test results show that the retaining wall only moves horizontally away from the slope.The displacement of the retaining wall would increase rapidly and no longer remain stable when the height of the retaining wall exceeds a certain height,which is defined as Limit Height.For different height of wall,the soil pressure increases linearly from top to down with negative value at the top of the retaining wall.The soil slope is mainly compressed vertically,and the vertical displacement increases linearly with the increase of retaining wall height,while the rate of the horizontal displacement would increase gradually.The height of retaining wall has minor influence on the distribution characteristics of slope displacement.The horizontal displacement of the internal slope points into the slope,while the horizontal displacement of the external slope points out of the slope.The area with outward displacement is defined as Risk Area that expands to the interior slope with increasing retaining wall height.

关 键 词：岩土工程 挡墙 土坡 变形 土-结构相互作用 离心模型试验 

分 类 号：U417.11:U416.1[交通运输工程—道路与铁道工程]