刚性墙后有限宽度土体主动滑裂面特征试验研究  

Experimental study on characteristics of active slip surface of limited width soil behind rigid wall

作　　者：王崇宇[1,2] 刘晓平 曹周红[1] 江旭[3] 张家强 WANG Chong-yu;LIU Xiao-ping;CAO Zhou-hong;JIANG Xu;ZHANG Jia-qiang(School of Hydraulic and Environmental Engineering,Changsha University of Science and Technology,Changsha,Hunan 410114,China;Hunan Water Planning&Design Institute Co.,Ltd.,Changsha,Hunan 410008,China;Hunan Provincial Communications Planning,Survey&design Institute Co.,Ltd,Changsha,Hunan 410200,China)

机构地区：[1]长沙理工大学水利与环境工程学院,湖南长沙410114 [2]湖南省水务规划设计院有限公司,湖南长沙410008 [3]湖南省交通规划勘察设计院有限公司,湖南长沙410200

出　　处：《岩土力学》2021年第11期2943-2952,共10页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.51309037);湖南省重点实验室基金项目(No.2018DT04)。

摘　　要：墙后土体滑裂面特征是土压力计算的重要依据,为了研究刚性墙后有限宽度土体主动滑裂面特征,利用无黏性砂开展室内模型试验,采集了试验过程中的土体图像,并采用数字图像相关法进行了分析,得到了土体的剪切应变、位移等,对平动(T模式)、绕墙底转动(RB模式)、绕墙顶转动(RT模式)变位模式进行了研究。研究结果表明:T模式、RB模式下有限宽度主动土体临界宽高比相近,RT模式宽临界高比相对较小;T模式有限宽度土体主动滑裂面呈现为"多折线"特征,根据滑裂角相似性可分为以移动挡墙、固定挡墙为起点发展的滑裂面;RB模式有限宽度主动滑裂面起点为墙踵上部,RT模式起点为墙踵,均延伸至固定挡墙中部;T模式、RT模式有限宽度土体水平和垂直位移可观察到明显的土拱特征,土拱边缘即为滑裂面。The characteristics of the slip surface of the soil are highly important for the calculation of earth pressure. In order to study the characteristics of the limited width soil active slip surface behind the rigid wall, laboratory model tests were carried out using non-cohesive sand, the images of soil during the test were collected and analyzed by digital image correlation method, the shear strain and displacement of soil are obtained, and the translation(T-mode) and rotation around the bottom of the wall are analyzed. The research results show that the critical aspect ratio of active soil with limited width is similar in T mode and RB mode, while in RT mode, the critical aspect ratio is relatively small;the active sliding surface of the soil with limited width in T mode presents the characteristic of "multi-refraction lines". According to the similarity of the sliding angle, it can be divided into the slip surface developed from the mobile retaining wall and the fixed retaining wall, the starting point of the active slip surface of limited-width soil in RB mode is the upper part of the wall heel, and the starting point of the RT mode is the wall heel, both of which extend to the middle of the fixed retaining wall. Obvious soil arch characteristics can be observed in the horizontal and vertical displacement of soil with limited width in T mode and RT mode, and the edge of soil arch is the sliding surface.

关 键 词：模型试验 有限宽度土体 主动变位模式 滑裂面 砂 

分 类 号：TU432[建筑科学—岩土工程]