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（中交一公局第三工程有限公司， 北京 100000）

［摘要］結(jié)合重慶軌道交通環(huán)線鳳鳴山站-上橋站區(qū)間TBM施工隧道工程，采用現(xiàn)場(chǎng)監(jiān)測(cè)與ANSYS有限元數(shù)值模擬的計(jì)算方法，針對(duì)后行隧道施工對(duì)先行隧道的受力及其變形的影響進(jìn)行分析。研究表明，在雙線平行隧道施工時(shí)，后行隧道施工會(huì)對(duì)先行隧道造成擠壓的作用，導(dǎo)致隧道管片橫向變形減小，環(huán)向內(nèi)力改變；并且通過改變雙線平行隧道的間距，認(rèn)為在砂巖（4級(jí)圍巖）情況下，隧道凈間距超過6.6m （1D）時(shí)，施工相互影響較弱，可以不進(jìn)行加固。

［關(guān)鍵詞］地鐵隧道； 盾構(gòu)法； 小間距； 有限元分析

中圖分類號(hào)： TU45 文獻(xiàn)標(biāo)識(shí)碼： A文章編號(hào)：  1002-848X(2016)S2-0604-05

Influence analysis on parallel tunnel with small spaced of TBM construction

Sun Heming， Fan Dedong， Hu Xipeng， Wang Wenguang， Hu Linhao

（The Third Engineering Co., Ltd. of the First Highway Engineering Bureau of CCCC, Beijing 100000, China）

Abstract: Based on the project of two shield tunnels between Fengmingshan station and Shangqiao station of Chongqing rail transit link, monitoring and ANSYS finite element numerical simulation were used to analyze  influence of the latter shield tunnel construction on internal force and deformation of the front tunnel . Studies have shown that in parallel tunnel construction the latter tunnel construction may press the front tunnel and cause internal force change of front tunnel; and by changing the parallel tunnel spacing construction interaction is weak when tunnel spacing is greater than 6.6m (1D) in sandstone (4 grade rock).

Keywords: metro tunnel; shield method; small spacing; finite element analysis