徐正良¹，  刘  涛²，  周生华³
（1 上海市城市建设设计研究院，上海200011； 2 上海市建设工程管理有限公司，上海200031； 3 同济大学土木工程学院地下建筑与工程系。上海2000921）

[摘要]  针对目前我国地铁车站施工中常遇到的地下大直径管线，提出不改迁管线，遇管线处围护结构局部留缺口、将管线悬吊的方法。采用FLAC3D程序，分析了大直径地下管线对基坑围护结构整体稳定性的影响，对围护结构封闭、开口及缺口部位土体加固等方案进行了施工过程三维仿真模拟。重点讨论了基坑底的隆起变形、基坑缺口附近土体的塑性区分布及水平位移、基坑缺口外侧的地表沉陷、各层支撑承受的轴力、基坑缺口附近连续墙体的水平位移及弯矩等力学响应。结果显示，采用文中方法保护地下管线并进行围护结构缺口处土体加固是可行的。
[关键词]  地铁车站；局部缺口；加固；管线保护；FLAC3D

Feasibility analyis on retaining structure with local open at buried pipeline through position
Xu Zhengliang1, Liu Tao2, Zhou Shenghua3
(1 Shanghai Urban Constructicn Design and Rasearch Institute, Shanghai 200011, China; 2 Shanghai Construction Engineering Administration Co., Ltd., Shanghai 200031, China; 3 Department of Geotechnical Engineering, School of Civil Engineering, Tongji University, Shanghai 200092, China)
   
Abstract: Most metro station situated at busy streets or under the main lines of communication often encounters with buried pipeline. Using the methods of retaining structure local open and pipdine hanging avoid the transfaence. 3D Fast Lagrangian element method is applied to simulate the excavation of foundation pit and analyze the reinforced structure at the local open. The results show that the method is feasible.
Keywords: metro station; local open; reinforcing; pipeline protection; 3D Fast Lagrangian element