地连墙内撑支护体系支撑有效刚度计算方法  

An effective stiffness calculation method of the inner-bracing in the system of diaphragm walls

作　　者：郭雪源 张明聚[2] 武立伟 GUO Xue-yuan;ZHANG Ming-ju;WU Li-wei(College of Civil and Architectural Engineering,North China University of Science and Technology,Tangshan 063000,China;Beijing Collaborative Innovation Center for Metropolitan Transportation,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]华北理工大学建筑工程学院,河北唐山063000 [2]北京工业大学北京城市交通协同创新中心,北京100124

出　　处：《兰州理工大学学报》2024年第5期126-132,共7页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51978018);河北省自然科学基金(E2022209060);中央引导地方科技发展资金项目(226Z4502G);唐山市科技计划项目(22150224J)。

摘　　要：针对地连墙内撑支护体系,综合考虑内支撑的初始挠曲、支撑杆件压弯二阶效应、支撑与地连墙的相互作用和地连墙变形等因素,建立内支撑的有效刚度计算方法.以北京地铁某车站基坑工程为背景,在ABAQUS有限元建模中分别引入现行规范支撑刚度和支撑有效刚度,进行基坑开挖与支护的数值模拟,并将模拟结果与实测结果进行对比分析.研究结果表明:内支撑有效刚度计算方法能更真实地反映基坑支护体系的实际受力、变形状态.Considering the effects of various factors on inner-bracing stiffness,including the initial deflection,the second-order effect of compression and bending in the inner-bracing,the interaction between the inner-bracing and diaphragm wall,the deformation of diaphragm wall,etc.,an effective stiffness calculation method for the inner-bracing was put forward for diaphragm wall and inner-bracing system.Taking the excavation engineering of a Beijing subway station project as a case study,the excavation process was simulated with ABAQUS finite element software,incorporating both the current standard support stiffness and the effective support stiffness.The simulation results were then compared with the measured data.The results show that effective stiffness calculation method for the inner-bracing accords with the real force and deformation state of the foundation pit support system.

关 键 词：基坑工程 地连墙 内支撑 内支撑刚度 有效刚度 

分 类 号：TU924[建筑科学—建筑设计及理论]