上海交通大学 船舶海洋与建筑工程学院， 上海 200240
通讯作者:李明广，男，助理研究员，E-mail: lmg20066028@sjtu.edu.cn.作者简介:肖潇（1985-），男，江西省南昌市人，博士生，研究方向为深基坑工程.E-mail: xiaoxiao8808@163.com.基金资助:国家自然科学基金重点项目（41330633），国家自然科学基金重点仪器专项（41727802）Vertical Deformation Mechanism of Diaphragm Wall Due to Unloading in Deep Excavation
XIAO Xiao，LI Mingguang，CHEN Jinjian，XIA XiaoheSchool of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
摘要/Abstract
摘要： 采用数值分析方法，研究开挖卸荷引起的基坑围护墙竖向变形机理.在有限差分软件中建立考虑土与结构共同作用的分析模型，采用理想弹塑性接触模型模拟墙土接触力学特性，对比分析了3种土体参数下墙体和墙底土体竖向位移、墙土相对位移和墙体两侧摩阻力分布特性.结果表明：墙体的竖向位移主要由墙底土体竖向隆起和墙土相对滑动共同决定；坑底土体位移主要受到土体卸荷回弹的影响，与土层参数关系较大；当黏聚力增大时，墙体的下沉量减小；砂土的摩擦角越大，墙体的竖向隆起量也越大；墙土相对滑动则受墙体两侧的摩阻力共同作用，而摩阻力受参数取值的影响；当接触属性变强时，坑内摩阻力上升的趋势将增强，墙体发生的竖向隆起量也显著增加.
关键词: 基坑, 地连墙, 竖向位移, 土与结构共同作用
Abstract: The numerical analysis method is adopted to study the vertical deformation mechanism of the retaining wall caused by unloading. A hypothetical model which considers the interaction between wall and soil, is established in the finite difference software. The ideal elastoplastic model is adopted to simulation the characteristics of contact property between soil and diaphragm wall. The vertical displacement of soil, the relative displacement of soil and wall and the distribution of friction under the 3 kinds of soil parameters are compared and analyzed. The results show that the vertical displacement of the wall can be divided into two parts the soil rebounded one and relatively sliding between subsoil and wall tips. The displacement of soil is mainly affected by unloading effect which is determined by soil parameter. The settlement of the wall decreases with the increase of soil cohesion. The uplift of the wall increases with the increase of friction angle. The relative sliding of wall tips and soil is governed by the frictional forces on two sides of the wall. With the increase of contact property, the frictional force increases and will lead to larger vertical displacements.
Key words: excavation, diaphragm wall, vertical displacement, soil-structure interaction
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