车站明挖基坑与相邻地下道路的相互影响分析  

Interaction Analysis of Railway Station Pit and Adjacent Underground Road

作　　者：李宗凯[1] 叶家强[2] 

机构地区：[1]北京市市政工程设计研究总院有限公司,100082 [2]北京市市政工程设计研究总院有限公司佛山分院,528200

出　　处：《特种结构》2015年第5期72-81,共10页Special Structures

摘　　要：佛山市南海区新型轨道交通系统试验段工程—佛山一环地下车站紧邻北侧佛平路地下道路。本文以佛山一环站为例,通过将土体、车站基坑及其围护结构、地下道路建立在同一个有限元模型中进行整体分析,考虑了其相互影响,从而解决了常规弹性支点杆系分析方法不适用于非对称基坑的问题。通过各有限元软件对比计算发现,常规平面杆件弹性算法不能准确计算基坑的位移,且可能存在个别支撑轴力计算偏小的情况。计算还表明,三维有限元分析得到支护结构以及相邻地下道路的变形均较二维有限元计算结果偏小,二维计算是偏于保守和安全的,可以满足一般工程的需求。本文同时指出,鉴于土体有限元分析的近似性和土层参数的离散性,在类似基坑的设计中也应采取有效的措施,确保基坑开挖过程中相邻建(构)筑物的安全。该明挖基坑的设计及计算分析可为今后类似工程提供参考和借鉴。The underground railway station of Foshan 1st Loop Station of New Rail Transit System Project in Nanhai District Foshan city is adjacent to Fo Ping Underground Road in the North. In this article, Foshan 1st Loop Station as an example, by putting the soil, foundation pit and its containment structures, undergroun d road structure together, an overallfinite element model was established in order to consider the interaction between them, then the problem which conventional elastic spring support for bar system algorithm not applied to non-symmetric pit was solved. Several finite element calculations show that the elastic spring support for bar system algorithm cannot accurately calculate such pit＇s displacement, and maybe some pit support bars＇ axial force are smaller than their actual situation. According to calculations, in addition, the deformation results of three-dimensional calculation of the containment structures and the underground road structures is smaller than the results of the two-dimensional calculation, so that two-dimensional calculation is regard as conservative and safe, and it is able to meet the requirements of real projects actually. Meanwhile, the article also points out that, in view of the approximation for finite element analysis and the discrete for soil parameters, it is strongly recommended that engineers adopt effective measures to ensure adjacent structures ＇safety during pit excavation in design of other similar project . The design and calculation of this pit provides references for similar projects in the future.

关 键 词：相互影响分析 车站明挖基坑 地下道路 下拉槽 有限元 

分 类 号：U231.3[交通运输工程—道路与铁道工程] TU91[建筑科学—建筑理论]