• 学报（中文） •

### 超载影响下围护结构非对称基坑的受力及变形特性分析

1. 上海交通大学 船舶海洋与建筑工程学院，上海 200240
• 出版日期:2020-06-28 发布日期:2020-07-03
• 通讯作者: 李明广，男，副研究员，电话（Tel.）:18801900699; E-mail: lmg20066028@ sjtu.edu.cn.
• 作者简介:高亿文（1994-），男，江苏省靖江市人，硕士生，主要从事岩土工程研究工作.
• 基金资助:
国家自然科学基金重点项目（41330633），国家自然科学基金面上项目（41472250），国家自然科学基金青年基金（41602283）

### Stress and Deformation Performance of Deep Excavation with Asymmetrical Retaining Structures in Adjacent Surcharge

GAO Yiwen,LI Mingguang,CHEN Jinjian

1. School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
• Online:2020-06-28 Published:2020-07-03

Abstract: In this paper, the influence of surcharge on the stress and deformation of retaining structures with different embedded lengths at each side is investigated through numerical analysis and field measurement relying on a foundation pit project in Xiamen. Fast Lagrangian Analysis of Continua in 3 Dimensions (FLAC3D) software is used to establish the typical section analysis model of the deep excavation. Soil behaviors are modeled by a constitutive that considers degradation of stiffness with shear strain. Excavations with different embedding depths and surcharges are simulated. Structure deformation, as well as adjacent soil stress distribution, is analyzed in association with field measurement. It is found that surcharge not only increases the stress and deformation of the retaining structure near the surcharge, but also forces the top of other retaining structure to move away from deep excavation. This further results in the passive earth pressure outside the pit and increases the deflection of the retaining structure on both sides. When the embedded depth of that retaining structure is insufficient, the surcharge further increases the inclination of retaining structure, which may cause significant kicking deformation. However, the deformation and tilt of the far-surcharge side retaining structure can be limited by increasing the embedded depth of retaining structure near the surcharge. When the distance between the surcharge and the foundation pit is greater than half of excavation depth, the effect of surcharge on the side overload of far-side can be ignored. The numerical results are consistent with the field measurement and can provide reference for related projects.