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(1 同濟(jì)大學(xué)地下建筑與工程系， 上海 200092； 2 華東建筑設(shè)計(jì)研究院有限公司， 上海 200002；

3 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］上海世博片區(qū)綠谷一期深大基坑工程緊鄰越江雙線盾構(gòu)隧道，基坑環(huán)境保護(hù)要求高，基坑采用分區(qū)方案實(shí)施。以PLAXIS3D有限元軟件建立基坑與鄰近隧道的三維有限元模型，土體采用HS-Small小應(yīng)變本構(gòu)模型，對(duì)基坑分區(qū)開挖的過(guò)程進(jìn)行了動(dòng)態(tài)模擬。計(jì)算結(jié)果與實(shí)測(cè)結(jié)果對(duì)比表明，采用HS-Small小應(yīng)變土體本構(gòu)模型的三維有限元分析能較好地模擬基坑的變形以及基坑開挖對(duì)鄰近隧道的影響；分區(qū)施工方案通過(guò)減小單個(gè)基坑的規(guī)模，充分利用了基坑的時(shí)空效應(yīng)，起到了很好的變形控制作用。

［關(guān)鍵詞］三維有限元； HS-Small模型； 變形控制； 分區(qū)施工

中圖分類號(hào)：TU398-7文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)02-0090-06

Threedimensional finite element analysis of the impact of zoned excavation on adjacent tunnels

Zhang Jiao1, Wang Weidong1,2,3, Li Jing2,3, Xu Zhonghua2,3

(1 Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China; 

2 East China Architectural Design & Research Institute Co., Ltd., Shanghai 200002, China;  

3 Shanghai Engineering Research Center of Safety Control for Facilities  Adjacent to Deep Excavations, Shanghai 200002, China)

Abstract:The foundation pit of Phase I of Lügu project in the Shanghai Expo district is a large and deep excavation. The excavation is adjacent to double line shield tunnels. In order to protect the tunnels, zoned excavation method was adopted for the foundation pit. Three-dimensional finite element analysis was carried out by using PLAXIS3D software to simulate the construction process of the deep excavation. The soils were modeled by using the HS-Small model which can describe the properties of soils at small strain level. Comparison of numerical results and field monitored data shows that 3D FEM analysis can give good prediction of deformation of the excavation and its impact on adjacent tunnels. It is also shown that, zoned excavation of dividing big pit into smaller ones can effectively control the deformation of deep excavation.

Keywords:3D FEM; HS-Small model; deformation control; zoned excavation

*上海市浦江人才計(jì)劃（15P51433500）。

作者簡(jiǎn)介：張嬌，博士研究生，Email:survey0936@163.com。