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(1 中電建南方建設(shè)投資有限公司， 深圳 518000； 2 浙江大學(xué)建筑工程學(xué)院， 杭州 310058)
［摘要］隨著城市地下空間的不斷開發(fā)利用，頂管法也在我國城市隧道施工中得到廣泛應(yīng)用。本文通過對深圳地鐵7號線華強北站淺覆土大斷面頂管施工過程中地表變形實際結(jié)果的整理分析，結(jié)合有限元分析方法，對淺埋條件下大斷面頂管頂進施工過程中地表變形的規(guī)律進行研究，分析注漿壓力等施工參數(shù)對地表變形的影響。通過不同影響因素的分析，發(fā)現(xiàn)頂管施工中土體損失是引起地表沉降的主要因素，因此實際施工中需要嚴(yán)格控制出土量。結(jié)果表明頂管頂進過程中由于土體損失作用，在頂管機掘進面上方地表會出現(xiàn)顯著沉降變形，隨著頂管進一步推進以及注漿壓力的施加，地表沉降會逐漸恢復(fù)并出現(xiàn)一定的隆起，隨著注漿壓力的消散，地表又表現(xiàn)為一定的沉降變形。地表沉降主要集中在頂管施工區(qū)域，顯著影響范圍為2.5倍頂管寬度。
［關(guān)鍵詞］大斷面頂管； 淺埋； 地表變形
中圖分類號： TU470 文獻標(biāo)識碼： A文章編號： 1002-848X(2016)S2-0510-06
Analysis of measured results of surface deformation induced by pipe jacking construction
Duan Jingchuan1, Wu Yong2, Yan Jiajia2, Wang Xu2, Xu Riqing2
(1 Electric Power Construction South Construction Investment Co., Ltd., Shenzhen 518000, China;
2 Research Center of Coastal and Urban Geotechnical Engineering of Zhejiang University, Hangzhou 310058, China)
Abstract： The field measured data of ground surface deformation induced by pipe jacking construction of Shenzhen metro line 7 was analyzed. FEM was adopted to study the ground surface deformation behavior and the influence of jet pressure. It was found that as a result of soil mass lost with the pipe jacking construction, obvious ground surface settlement was measured around the driving face. With further pipe jacking construction and application of grouting pressure, the ground settlement recovered and even heaved. With the dissipation of grouting pressure, ground surface settlement occurred again. Significant ground surface settlements mainly observed in the pipe jacking construction region, which had a width of 2.5 times of the width of pipe jacking.
Keywords： large section pipe jacking, shallow buried; ground surface deformation
作者簡介： 段景川，碩士，Email:350669890@qq.com。
