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緊鄰既有高速公路偏壓地鐵深基坑圍護(hù)結(jié)構(gòu)變形監(jiān)測(cè)與數(shù)值模擬研究*
汪東林 汪磊
摘 要

(安徽建筑大學(xué)土木工程學(xué)院, 合肥 230601

[摘要]以合肥地鐵車站6號(hào)風(fēng)井深基坑為研究背景,結(jié)合現(xiàn)場(chǎng)施工監(jiān)測(cè)和數(shù)值模擬計(jì)算,對(duì)既有緊鄰合寧高速公路偏壓作用下的深基坑開展其開挖過(guò)程中圍護(hù)樁水平位移、圍護(hù)樁豎向位移及其相鄰路基沉降規(guī)律的研究。結(jié)果表明:路基偏壓對(duì)于圍護(hù)樁水平位移影響很大,偏壓側(cè)最大水平位移約為非偏壓側(cè)的3倍左右;而路基偏壓對(duì)圍護(hù)樁頂豎向位移影響不大,路基偏壓側(cè)和非偏壓側(cè)圍護(hù)樁頂?shù)呢Q向位移量基本相同;深基坑開挖對(duì)既有合寧高速路基沉降影響很大,路基兩側(cè)沉降變形趨勢(shì)大致相同,且緊鄰基坑側(cè)路基最大沉降量約為偏離基坑側(cè)路基沉降量的2倍。

[關(guān)鍵詞]偏壓基坑; 現(xiàn)場(chǎng)監(jiān)測(cè); 數(shù)值模擬; 水平位移

中圖分類號(hào):TU4732文獻(xiàn)標(biāo)識(shí)碼:A文章編號(hào):1002-848X(2015)11-0091-05

Study on field monitoring and numerical simulation of deformation of deep foundation pit

retaining structure under  unsymmetrical load condition adjacent to existing highway

Wang Donglin, Wang Lei

Department of Civil Engineering, Anhui Jianzhu University Hefei 230601, China

Abstract:Taking No.6 air shaft deep foundation pit of Hefei subway station as the research background, combined with the field monitoring and numerical simulation calculation, the rule of deep horizontal displacement,vertical displacement of the retaining pile and its adjacent subgrade settlement were studied in the process of the deep foundation pit excavation under

 unsymmetrical loads

 of the He\|Ning highway. The results show that the roadbed unsymmetrical load affects horizontal displacement of retaining pile greatly, and the biggest horizontal displacement of unsymmetrically loaded side is about three times of symmetrically loaded side. The roadbed unsymmetrical load has little effect on vertical displacement of the pile, and the vertical displacements of the pile of unsymmetrically loaded side and symmetrically loaded side are basically the same. Deep foundation pit excavation has great influence on the  He-Ning highway roadbed settlement. On both sides of subgrade, settlement deformation trend is roughly same and the subgrade settlement close to the foundation pit is about 2 times of that deviating from the foundation pit.

Keywords:unsymmetrically loaded foundation pit; in-situ monitoring; numerical simulation; horizontal displacement

*安徽省自然科學(xué)基金項(xiàng)目(1308085QE85),校企橫向委托課題(2014CGFZ3107),2014年省級(jí)質(zhì)量工程項(xiàng)目(2014tszy023)。

作者簡(jiǎn)介:汪東林,博士,副教授,Emailwdlvip@126.com。

參考文獻(xiàn)

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