基于测斜数据弯矩反分析的地下连续墙安全评估  

Safety Evaluation of Diaphragm Wall Based on Feedback Calculation for Bending Moment

作　　者：杨潇[1] 刘国彬[1] 宋浩然 Yang Xiao Liu Guobin Song Haoran(Department of Geotechnical Engineering, Tongfi University, Shanghai 200092, China China Construction Third Engineering Bureau Co. , Ltd. , Changchun, Jilin 130000, China)

机构地区：[1]同济大学地下建筑与工程系,上海200092 [2]中建三局集团有限公司,吉林长春130000

出　　处：《施工技术》2016年第19期52-56,65,共6页Construction Technology

基　　金：上海市城乡建设和交通委员会科研项目

摘　　要：基于上海地区某地铁车站深基坑长期测斜监测数据,实现了地下连续墙弯矩的反分析,得出了不同开挖阶段的地下连续墙弯矩发展变化规律,并提出了一套适用于地下连续墙安全评估的弯矩控制指标。研究发现,不同开挖阶段不同基坑位置地下连续墙弯矩的发展差异很大;周边高层建筑物的存在加剧了地下连续墙弯矩的产生;基于内力反分析的地下连续墙安全评估,有助于工程师从力学角度掌握基坑的安全状况,一定程度上节省了实施围护结构内力监测的费用。Based on a long-term monitoring of diaphragm wall deflection in a deep metro station excavation in Shanghai, the feedback calculation for bending moment is carried out. Then a series of critical indexes of bending moment are originally introduced to help realize the safety evaluation of diaphragm wall. Based on the safety evaluation, subsequent major findings are obtained： there exists a certain difference of development of bending moment in diaphragm wall with different positions and excavation stages. It has to pay much attention to the adverse impact on diaphragm wall induced by tall building adhere to excavation. Thus, without any expense on the field measurements of reinforcement stress, engineers are given access to grasp the bending moment development of diaphragm wall timely and directly during excavation process, which is of certain reference value for the prevention of diaphragm wall failure.

关 键 词：地下工程 地下连续墙 弯矩 反分析 监测 安全评估 

分 类 号：TU476.3[建筑科学—结构工程]