超深圆形基坑计算分析方法及工程应用  

Analysis Method of Ultra⁃deep Circular Excavation and Its Application

作　　者：徐中华 李靖 翁其平 李煜峰 王卫东 XU Zhonghua;LI Jing;WENG Qiping;LI Yufeng;WANG Weidong(Shanghai Underground Space Engineering Design&Research Institute,East China Architecture Design&Research Institute Co.,Ltd,Shanghai 200002,China;Shanghai Engineering Research Center of Safety Control for Facilities Adjacent to Deep Excavations,Shanghai 200002,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]华东建筑设计研究院有限公司上海地下空间与工程设计研究院,上海200002 [2]上海基坑工程环境安全控制工程技术研究中心,上海200002 [3]同济大学地下建筑与工程系,上海200092

出　　处：《施工技术（中英文）》2022年第1期13-20,共8页Construction Technology

基　　金：上海市科学技术委员会科研计划项目子课题(13231201006)。

摘　　要：圆筒形结构由于其良好的受力特性,近年来已成为大深度地下空间开发中一种有效的基坑支护形式。圆形基坑的受力和变形不同于一般的方形或长条形基坑,规范中推荐的平面弹性抗力法无法考虑圆形基坑的空间效应,不适合于圆形深基坑的分析。提出采用三维m法分析圆形基坑支护结构的受力和变形。考虑地下连续墙接头削弱作用、垂直度误差、水下浇筑混凝土质量等因素,基于反分析得到了采用三维m法分析时合理的地下连续墙刚度折减系数。采用三维m法分析了两个挖深50m级以上超深圆形基坑工程,结果表明计算分析结果与实测数据能够较好吻合,该方法有助于更好地指导超深圆形基坑工程的设计。Because of its good mechanical characteristics,cylindrical structure has become an effective excavation support type for deep underground space engineering in recent years.The stress and deformation of circular excavations are quite different from those of square or strip excavations.The analysis method of plane beam on elastic subgrade recommended by the codes,which cannot consider the spatial effect of circular excavation,is not suitable for analysis of circular excavation.This paper proposed a 3-D m method to analyze the supporting structure of circular excavations.Based on inverse analysis,the reduction coefficient of the stiffness of the circular diaphragm wall considering the weakening effect of wall joints,construction error and underwater concrete quality was proposed.The proposed method was used to analyze the two more than 50m deep circular excavations in shanghai.The calculated results were consist well with monitored data.This method is helpful to better guide the design of ultra⁃deep circular excavations.

关 键 词：圆形基坑 地下连续墙 空间效应 三维m法 刚度折减系数 受力 变形 

分 类 号：TU753[建筑科学—建筑技术科学]