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［摘要］廣州珠江新城核心區(qū)市政交通項(xiàng)目金穗路以北地下空間基坑位于地鐵隧道正上方，基坑開挖、工程（人工挖孔）樁及上蓋荷載施工對(duì)地鐵隧道結(jié)構(gòu)的影響為該工程的關(guān)鍵問題。為此，利用MIDAS/GTS建立有限元模型，對(duì)實(shí)際的施工工況進(jìn)行模擬。研究結(jié)果表明：隧道結(jié)構(gòu)處于中風(fēng)化地層的變形量?jī)H為強(qiáng)風(fēng)化地層的1/3；近距離人工挖孔樁、隧道上方上蓋荷載施工及增大轉(zhuǎn)換梁的剛度均能在一定程度上約束隧道的水平和豎向變形；土體偏壓開挖對(duì)隧道結(jié)構(gòu)水平方向變形影響較大。根據(jù)研究結(jié)果，提出對(duì)下方既有隧道的保護(hù)措施，以確保地鐵結(jié)構(gòu)安全和正常運(yùn)營(yíng)，為設(shè)計(jì)和施工提供指導(dǎo)意見。

［關(guān)鍵詞］基坑開挖；盾構(gòu)隧道；變形增量；上蓋荷載；轉(zhuǎn)換梁；數(shù)值模擬

中圖分類號(hào)：TU753.1文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2012)06-0107-05

 

Qin Qianbo, Fang Yinqing

(Guangzhou Design Institute, Guangzhou 510620, China)

 

Abstract: The deep excavation of the municipal traffic project in the north of Jinsui Road in the core area of Zhujiang New Town in Guangzhou is above the operating subway tunnels, so the impact of foundation pit excavation, engineering (artificial dig-hole) pile construction and the cover load on the subway tunnels become a key issue. For this reason, a model was established and the actual construction conditions were simulated using MIDAS software. The results show that: the deformation increment formation in the middle of weathering occurred only 1/3 in the strongly weathered around the tunnel shield; the close artificial dig-hole pile on the edge of subway tunnels, the cover load and increasing the stiffness of the beam transformation can bind the vertical and horizontal deformation; the influence of the eccentric soil excavation is much bigger on the horizontal deformation of tunnel structure. Based on the results, the protective measures were proposed to ensure the structural safety and the normal operation of subway tunnels, which provide useful references to the design and construction.

Keywords: deep excavation; shield tunnel; deformation increment; cover load; converted beam; numerical simulation

作者簡(jiǎn)介：秦前波，碩士，工程師，注冊(cè)巖土工程師，Email：qqbren2325@126.com.

 

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