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（1 華東建筑設(shè)計(jì)研究總院地基基礎(chǔ)與地下工程設(shè)計(jì)研究中心，上海 200002；2 上?；庸こ汰h(huán)境安全控制工程技術(shù)研究中心，上海 200002）

［摘要］基于鄰近運(yùn)營(yíng)地鐵隧道的蘇州財(cái)富廣場(chǎng)深基坑工程，從基坑支護(hù)結(jié)構(gòu)設(shè)計(jì)、深層承壓水處理等方面采取了一系列針對(duì)性措施來(lái)保護(hù)地鐵隧道。首次在蘇州地區(qū)采用超深TRD工法等厚度水泥土攪拌墻，有效地隔斷了深層承壓含水層，避免了承壓水降水對(duì)地鐵隧道的影響，相比采用地下連續(xù)墻隔斷方案，大大節(jié)省了工程投資。建立三維有限元模型對(duì)基坑開(kāi)挖過(guò)程進(jìn)行了模擬分析，結(jié)果表明：基坑圍護(hù)體和地鐵隧道位移計(jì)算值和實(shí)測(cè)值較吻合，地鐵隧道位移的分布和發(fā)展與基坑圍護(hù)體的位移及開(kāi)挖進(jìn)程密切相關(guān)，地鐵隧道水平和豎向位移主要產(chǎn)生在鄰近基坑開(kāi)挖的范圍內(nèi)，隧道底部埋深與基坑挖深較接近時(shí)隧道產(chǎn)生隆起。該基坑工程成功實(shí)施，基坑開(kāi)挖和降水滿足保護(hù)地鐵隧道的要求。

［關(guān)鍵詞］基坑; 地鐵隧道; 超深TRD工法; 等厚度水泥土攪拌墻; 地下連續(xù)墻; 承壓水; 有限元

中圖分類(lèi)號(hào)：TU46+3      文獻(xiàn)標(biāo)識(shí)碼：A      文章編號(hào)：1002-848X(2014)17-0056-07

Design and practice of a deep foundation pit project adjacent to subway tunnel using super deep TRD construction method to control confined water

Wang Weidong1, 2, Chang Linyue1, 2, Tan Ke1, 2

（1 Department of Underground Structure & Geotechnical Engineering, East China Architecture

Design & Research Institute, Shanghai 200002, China; 2 Shanghai Engineering Research Center of Safety Control for Facilities Adjacent to Deep Excavations, Shanghai 200002, China）

Abstract:The deep foundation pit project of Suzhou Fortune Plaza is adjacent to subway tunnels in operation. A series of technical measures were taken to protect the subway tunnels such as the structural design of the supporting system and the treatment method of the deep confined water. The super deep TRD construction method of cement-soil wall with uniform thickness was firstly used in Suzhou area to cut off the deep confined water layer effectively. As a result, the influence of pumping the confined water on the subway tunnels was effectively avoided. Comparing to using the underground diaphram wall to cut off the deep confined water, the project investment  was significantly reduced by using super deep TRD construction method of cement-soil wall with uniform thickness.Three-dimensional finite element model was established to simulate the foundation pit excavation process. The results show that the calculated displacement values of the retaining wall and the subway tunnels are in good agreement with the measured values. The distribution and development of the displacement of the subway tunnels are closely related to the displacement of the retaining wall and the excavation process of the foundation pit. The horizontal and vertical displacement of the subway tunnels mainly occur in the range of the neighboring excavation. The tunnels are uplifted when the bottom of the tunnels was close to the bottom of the foundation pit. The foundation pit is successfully excavated. The effects of foundation pit excavation and dewatering on the subway tunnels satisfy the requirements of protecting the subway tunnels.

Keywords:foundation pit; subway tunnel; super deep TRD construction method; cement-soil wall with uniform thickness; underground diaphram wall; confined water; finite element

*上海市科委平臺(tái)建設(shè)項(xiàng)目（13DZ2251400），上海市建交委科研項(xiàng)目（建管2013-009-009），國(guó)家十二五科技支撐計(jì)劃（2012BAJ01B02）。

作者簡(jiǎn)介：王衛(wèi)東，博士，教授級(jí)高級(jí)工程師，總工程師，Email:weidong_wang@ecadi.com。

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