地铁基坑施工对临近桥梁的影响探析

Analysis of Influence of Subway Foundation Pit on Adjacent Bridges

为探讨地铁车站基坑施工过程中,对临近现有桥梁的稳定性的影响,为类似工程提供借鉴,以某新建地铁站为工程背景,采用Midas GTS有限元软件,建立有限元分析模型,提取施工全过程中桥梁桩基的最大竖向和横向变形数据,并根据控制标准,对桥梁的安全性进行评估。评估结果表明:桥梁桩基竖向位移最大值为0.12 mm,横向位移最大值为0.54 mm,两者均位于控制指标范围之内。在地铁车站施工过程中,桥梁桩基最大的位移响应为水平位移,整个施工过程中,基坑开挖起始阶段的影响最大,需要重点关注。

In the process of subway pit construction,it is inevitable to have a large or small impact on the already existing ground buildings and so on.It is necessary to carry out relevant safety assessment work during the construction process.In order to explore the influence of the construction process of the subway station pit on the stability of the adjacent existing bridges and to provide reference for similar projects,this paper takes a new subway station as the engineering background,uses Midas GTS finite element software to establish a finite element analysis model,extracts the maximum vertical and lateral deformation data of the bridge piles during the whole construction process,and evaluates the safety of the bridge according to the control criteria.The evaluation results show that the maximum vertical displacement of bridge piles is 0.12mm and the maximum lateral displacement is 0.54mm,both of which are within the control index.During the construction of the subway station,the maximum displacement response of bridge piles is horizontal displacement,and the influence of the starting stage of foundation excavation is the greatest during the whole construction process,which needs to be focused on.