考虑施工影响的地下交通结构动力响应数值分析  

Numerical Analysis of the Dynamic Response of Underground Transportation Structures Considering the Effects of Construction

作　　者：刘海洋 欧阳韦 陈正 周毅恒 LIU Haiyang;OUYANG Wei;CHEN Zheng;ZHOU Yiheng

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]中电建路桥集团有限公司,北京100160

出　　处：《上海公路》2024年第4期63-67,77,M0005,共7页Shanghai Highways

摘　　要：城市地下交通结构运营安全与结构施工开挖支护过程密切相关。为分析地下交通结构施工开挖支护对主体结构力学响应的影响,依托义乌某在建地下交通结构工程,基于ABAQUS有限元软件,建立了地下交通结构仿真模型,并对比分析了考虑和不考虑施工影响时,地下结构的加速度响应与动应力变化规律。结果表明:地下交通结构的受力变形与施工过程密切相关,基于ABAQUS生死单元法建立的地下交通结构仿真模型可分析施工开挖支护等对主体结构力学响应的影响。考虑支护结构影响下,主体结构各位置的振动加速度响应幅值明显减小,且振动加速度响应衰减较快。远离支护位置的市政交通层动应力增加较小,而靠近支护结构的轨道交通层动应力最大,且增加最为明显。地下结构运营中,应更加关注轨道交通层的结构状态。The structural safety of urban underground transportation structures during the operation is intimately linked to the construction processes,particularly excavation and support.This study,based on an ongoing project in Yiwu,utilizes the ABAQUS finite element software to establish a simulation model of the underground structure.It compares the acceleration responses and dynamic stress variations with and without considering construction effects.The results indicate that the stress and deformation of the underground transportation structure are significantly influenced by the construction activities,and the simulation model of the underground transportation structure established using the ABAQUS finite element method can analyze the effects of construction,excavation,and support on the mechanical response of the main structure.When support structures are considered,the vibration acceleration response amplitude at various positions of the main structure significantly decreases,and the vibration acceleration response attenuates rapidly.Dynamic stress increases minimally in the municipal transportation layer distant from support structures,while near the supports,the railway transportation layer experiences the highest and most significant stress increases.During operation,particular attention should be paid to the structural condition of the railway transportation layer.

关 键 词：地下交通结构 数值仿真 施工影响 动力响应 

分 类 号：TU93[建筑科学—结构工程]