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浙江大学学报(工学版)
土木工程、建筑工程     
上海软土地区某地铁风井深基坑案例分析
谭勇, 康志军, 卫彬, 邓刚
1.同济大学 地下建筑与工程系,上海 200092| 2. 中铁二院 华东勘察设计有限责任公司,上海 200023|
3. 四川省交通运输厅公路规划勘察设计研究院,四川 成都 611130
Case study on deep excavation for metro ventilation shaft in Shanghai soft clay
TAN Yong, KANG Zhi jun, WEI Bin, DENG Gang
1. Geotechnical Department, Tongji University, Shanghai 200092, China; 2. China Railway Eryuan Engineering Group
Company, East China Survey and Design Co.Ltd, Shanghai 200032, China; 3. Sichuan Provincial Transport
Department Highway Planning, Survey, Design and Research Institute, Chengdu 611130, China
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摘要:

针对上海软土地层中某地铁风井深基坑的工程概况,结合地质条件和现场施工工序,分析围护结构变形、支撑轴力、立柱隆起和地表沉降等现场监测数据,并与其他工程案例进行对比,研究该基坑的变形性状.研究结果表明:虽然钢筋混凝土支撑刚度较大,但其浇筑及混凝土养护时间较长,在软土流变作用下,围护结构侧向位移在支撑施工期间随时间大幅增加.由于承受较大的土压力,混凝土支撑下的钢支撑设计轴力无法被完全利用,实测轴力值偏小.由于深部承压含水层的作用,当基坑开挖深度较大时,地表经历明显的上升.地下连续墙施工将导致不容忽视地表沉降,其沉降影响范围与基坑开挖所造成的影响范围相当.与上海地区地铁车站基坑变形对比发现:本风井基坑开挖所造成的地表沉降和沉降影响范围都较小.

Abstract:

 Based on the basic project information of a ventilation shaft excavation in Shanghai soft clay, the deformation behaviors of the foundation pit were studied through analysis and comparisons of field instrumentation data including displacements of retaining walls, axial strut force, column uplift and ground settlement, considering geological conditions and main construction stages. Results show that retaining walls develop significant timedependent lateral displacements due to long construction duration for casting and curing of concrete struts. Since rigid concrete struts shared in load supposed to be sustained by steel pipe struts braced at next levels, axial forces of the steel pipe struts were unable to be fully utilized. Due to the confined aquifer in deeper layers, ground experienced noticeable upheaving as excavation went deeper. The construction of diaphragm wall panels resulted in significant ground settlement, and the associated settlement influence zone was even comparable to that caused by excavation. Compared with the settlement data from metro station excavations in Shanghai, ground settlement and the relevant settlement influence zone of the case are relatively smaller.

出版日期: 2016-06-01
:  TU 447  
基金资助:

国家“973”重点基础研究发展规划资助项目(2015CB057800).

作者简介: 谭勇(1975—),男,副教授,从事深基坑工程、桩基础及地基处理研究. OCRID:0000000331075454. E-mail: tanyong21th@tongji.edu.cn
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谭勇, 康志军, 卫彬, 邓刚. 上海软土地区某地铁风井深基坑案例分析[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008973X.2016.06.006.

TAN Yong, KANG Zhi jun, WEI Bin, DENG Gang. Case study on deep excavation for metro ventilation shaft in Shanghai soft clay. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008973X.2016.06.006.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008973X.2016.06.006        http://www.zjujournals.com/eng/CN/Y2016/V50/I6/1048

[1] 龚晓南.关于基坑工程的几点思考 [J].土木工程学报,2005,38(9): 99-102.
GONG Xiaonan. Considerations on foundation pit engineering [J]. China Civil Engineering Journal, 2005, 38(9): 99-102.
[2] 徐中华.上海地区支护结构与主体地下结构相结合的深基坑变形性状研究 [D]. 上海: 上海交通大学, 2007
XU Zhonghua. Deformation behavior of deep excavations supported by permanent structure in Shanghai soft deposit [D]. Shanghai: Shanghai Jiaotong University,2007.
[3] WANG J H, XU Z H, WANG W D. Wall and ground movements due to deep excavations in Shanghai soft soils [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2010, 136(7): 985-994.
[4] TAN Y, WEI B, ZHOU X, et al. Lessons learned from construction of shanghai metro stations: importance of quick excavation, prompt propping, timely casting, and segmented construction [J]. Journal of Performance of Constructed Facilities, 2015, 29(4): 04014096.
[5] TAN Y, LI M W. Measured performance of a 26 m deep topdown excavation in downtown Shanghai [J].  Canadian Geotechnical Journal, 2011, 48(5): 704-719.
[6] TAN Y, WANG D L. Characteristics of a largescale deep foundation pit excavated by the centralisland technique in Shanghai soft clay.I: bottomup construction of the central cylindrical shaft [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2013, 139(11): 1875-1893.
[7] TAN Y, WANG D L. Characteristics of a largescale deep foundation pit excavated by the centralisland technique in Shanghai soft clay.II: topdown construction of the peripheral rectangular pit [J]. Journal of Geotechnical and Geoenvironmental Engineering, 2013, 139(11): 1894-1910.
[8] 郑刚,邓旭,刘畅,等.不同围护结构变形模式对坑外深层土体位移场影响的对比分析[J]. 岩土工程学报, 2014, 36(2): 273-285.
ZHENG Gang, DENG Xu, LIU Chang, et al. Comparative analysis of influences of different deformation modes of retaining structures on displacement field of deep soils outside excavations [J]. Chinese Journal of Geotechnical Engineering, 2014, 36(2): 273-285.
[9] 郑刚,李志伟.不同围护结构变形形式的基坑开挖对邻近建筑物的影响对比分析 [J]. 岩土工程学报, 2012,34(6): 969-977.
ZHENG Gang, LI Zhiwei. Comparative analysis of  responses of buildings adjacent to excavations with different deformation modes of retaining walls [J]. Chinese Journal of Geotechnical Engineering, 2012, 34(6): 969-977.
[10] 徐长节,成守泽,蔡袁强,等.非对称开挖条件下基坑变形性状分析 [J].岩土力学,2014, 35(7): 1929-1934.
XU Changjie, CHENG Shouze, CAI Yuanqiang, et al. Deformation characteristic analysis of foundation pit under asymmetric excavation condition [J]. Rock and Soil Mechanics, 2014, 35(7): 1929-1934.
[11] 应宏伟,章丽莎,谢康和,等.坑外地下水位波动引起的基坑水土压力响应[J].浙江大学学报: 工学版, 2014, 48(3): 492-497.
YING Hongwei, ZHANG Lisha, XIE Kanghe, et al. Pore and earth pressure response to groundwater fluctuation out of foundation pit [J]. Journal of Zhejiang University: Engineering Science, 2014, 48(3): 492-497.
[12] XU C J, CHEN Q Z, WANG Y L, et al. Dynamicdeformation control of retaining structures of a deep excavation [J]. Journal of Performance of Constructed Facilities, 2015: 04015071.
[13] XU C J, YIN M, LIN G. Characters analysis of the retaining structure of the foundation pit under local load [J]. In Applied Mechanics and Materials, 2014, 477: 448-452.
[14] XU C J, XU Y L, LIN H H, et al. Influences of vehicle loads on braced excavation in soft clay [J]. In Applied Mechanics and Materials, 2013, 353: 146-151.
[15] 欧章煜,深开挖工程分析设计理论与实务[M].台北:科技图书股份有限公司,2004: 202-205.
[16] CLOUGN G W, O’ ROURKE T D. Construction induced movements of insitu walls [C] ∥ Proceedings of the Design and Performance of Earth Retaining Structures. New York: ASCE, 1990: 439-470.
[17] PECK R B. Deep excavations and tunneling in soft ground [C] ∥ Proceedings of the 7th International Conference on Soil Mechanics and Foundation Engineering. Mexico City: ISSMGE, 1969: 225-281.

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