深埋盾構(gòu)隧道受力特性有限元研究與分析
譚軍1，王錦森1，翟傳明1，劉菁2
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（1 中電投工程研究檢測評定中心，北京 100840；2 北京市電力公司，北京 100031 ）[摘要] 本文以地層結(jié)構(gòu)法為基本研究方法，基于地鐵盾構(gòu)隧道埋深、管片接頭處橡膠材料以及地面堆載三個基本因素的影響，對地鐵盾構(gòu)隧道襯砌管片、管片接頭及管片接頭處橡膠墊層的應力、應變及變形開展有限元分析。有限元分析中采用包含襯砌管片、管片接頭處橡膠墊層及周圍土體的三維實體有限元模型。研究結(jié)果表明:地鐵盾構(gòu)隧道整體襯砌管片和橡膠墊層的應力、應變及變形是相對均勻的；管片接頭處出現(xiàn)的不連續(xù)位移，隨隧道埋深的增大而增大，隨橡膠墊層彈性模型的增大而減?。还芷宇^處存在明顯的拉應力集中現(xiàn)象，在埋深為75m以上時，集中拉應力超出鋼筋混凝土管片的極限拉應力。該研究對以后地鐵盾構(gòu)隧道襯砌管片的設計具有一定的理論和實踐價值。中圖分類號： U451+.4 文獻標識碼：A 文章編號：1002-848X(2013)S2-0092-04作者簡介： 譚軍，博士，副研究員，Email:tanjun_me@163.com。The finite element mechanical study and analysis of shield tunnel with buried depthTan Jun1, Wang Jinsen1, Zhai Chuanming1, Liu Jing 2（1 C+E Center for Engineering Research Test and Appraisal, Beijing 100840, China; 2 Beijing Electric Power Corporation, Beijing 100031, China)Abstract: The basic research method for the paper is stratigraphic structure method, which carrying out the finite element analysis for the stress, strain and deformation of subway shield tunnel lining segment, segment joint and segment layup rubber cushion layer, considering three basic factors of subway shield tunnel buried depth, the material of segment layup rubber and the ground heap load. This paper uses the three−dimensional entity finite element model, which includes the lining segment, the segment layup rubber layer and the surrounding soil. The result of this paper shows that the stress, the strain and the deformation of the whole subway shield tunnel lining segment and the rubber layer is relatively homogeneous; the segment joints appear discontinuous displacement, which increases along with the tunnel buried depth increases ,with rubber layer elastic model decreases; the segment joints exist obvious tension stress concentration phenomenon, when tunnel buried depth over 75 meters, the concentrated tensile stress is beyond the limit of reinforced concrete segments tensile stress. The study has some certain theoretical and practical value on the subway shield tunnel lining segment design in the future.Keywords: stratigraphic structure method; finite element analysis; through seam stitching; discontinuous displacement.
