平行盾构隧道施工对既有隧道影响的数值分析
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摘要
采用三维有限元方法对平行盾构隧道施工进行模拟,分析新隧道动态掘进时既有隧道位移、变形和内力的变化规律。模型中考虑了盾构机与管片衬砌相互作用,管片衬砌结构的横观各向同性性质。计算结果表明,既有隧道在盾构机附近主要产生纵向上的不均匀沉降和侧移,在盾构机后方主要产生横断面内的旋转。新隧道的修建还将使既有隧道受到“侧向加载“效应,使其横断面内的弯矩减小,轴力增大,且左、右侧受力不再对称。既有隧道纵向受力出现先受压、后受拉的特征,且在远离新隧道侧将出现最不利应力状态。分析表明盾构机顶进力、注浆压力和地层损失对既有隧道的影响较大,施工中应严格控制,而顶进反力的影响相对较小。该工作为类似工程的施工提供参考。
3D-FEM is applied to simulate the construction of parallel shield tunnels,and the laws of displacement,deformation and internal force of the old tunnel are analyzed along with the dynamic driving of the new one.In analyzing the interaction between shield machine and lining structure is taken into consideration in the model,as well as the transverse isotropy of lining structure.The results show that in the existent tunnel longitudinal nonuniform settlement and lateral displacement appear around the shield machine,and traverse torsion occurs behind the shield machine.The construction of new tunnel will apply the “lateral loading” effects to the old one,decrease the moment and increase the axial force in the traverse section,and make the internal force state of left and right sides to be not symmetrical any more.The longitudinal force-bearing state of the existent tunnel experiences a process of first compression followed by tension,and the most unfavorable stress state appears in its side far away from the new one.The thrust force,grouting pressure,and stratum loss,which should be controlled strictly,have great effects on the old tunnel;and the counterforce of thrust has a minor effect comparatively.This work offers references for the construction of similar engineering.
3D-FEM is applied to simulate the construction of parallel shield tunnels,and the laws of displacement,deformation and internal force of the old tunnel are analyzed along with the dynamic driving of the new one.In analyzing the interaction between shield machine and lining structure is taken into consideration in the model,as well as the transverse isotropy of lining structure.The results show that in the existent tunnel longitudinal nonuniform settlement and lateral displacement appear around the shield machine,and traverse torsion occurs behind the shield machine.The construction of new tunnel will apply the “lateral loading” effects to the old one,decrease the moment and increase the axial force in the traverse section,and make the internal force state of left and right sides to be not symmetrical any more.The longitudinal force-bearing state of the existent tunnel experiences a process of first compression followed by tension,and the most unfavorable stress state appears in its side far away from the new one.The thrust force,grouting pressure,and stratum loss,which should be controlled strictly,have great effects on the old tunnel;and the counterforce of thrust has a minor effect comparatively.This work offers references for the construction of similar engineering.
引文
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[3]王敏强,陈胜宏.盾构推进隧道结构三维非线性有限元仿真[J].岩石力学与工程学报,2002,21(2):228-232.WANG Ming-qiang,CHEN Sheng-hong.3-Dimentional nonlinear finite element simulation of tunnel structure for moving forward shield[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(2):228-232.
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[5]何川.シ–ルドトンネル縱断方向の地震時舉動に關すゐ研究[博士學位論文D].東京:早稻田大學專業理工學部,1999.
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[7]张云,殷宗泽,徐永福.盾构法隧道引起的地表变形分析[J].岩石力学与工程学报,2002,21(3):388-392.ZHANG Yun,YING Zong-ze,XU Yong-fu.Analysis of three-dimensional ground surface deformations due to shield tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(3):388-392.
[8]张凤祥,朱合华,傅德明.盾构隧道[M].北京:人民交通出版社,2004.388-390.
[2]于宁,朱合华.盾构隧道施工地表变形分析与三维有限元模拟[J].岩土力学,2002,25(8):1 330-1 334.YU Ning,ZHU He-hua.Analysis of earth deformation caused by shield tunnel construction and 3D-FEM simulation[J].Rock and Soil Mechanics,2002,25(8):1 330-1 334
[3]王敏强,陈胜宏.盾构推进隧道结构三维非线性有限元仿真[J].岩石力学与工程学报,2002,21(2):228-232.WANG Ming-qiang,CHEN Sheng-hong.3-Dimentional nonlinear finite element simulation of tunnel structure for moving forward shield[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(2):228-232.
[4]土木学会(日).隧道标准规范(盾构篇)及解说[S].朱伟译.北京:中国建筑工业出版社,2001.68-72.
[5]何川.シ–ルドトンネル縱断方向の地震時舉動に關すゐ研究[博士學位論文D].東京:早稻田大學專業理工學部,1999.
[6]易宏伟.盾构法施工对土体扰动和地层移动影响的研究[博士论文D].上海:同济大学,1999.
[7]张云,殷宗泽,徐永福.盾构法隧道引起的地表变形分析[J].岩石力学与工程学报,2002,21(3):388-392.ZHANG Yun,YING Zong-ze,XU Yong-fu.Analysis of three-dimensional ground surface deformations due to shield tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2002,21(3):388-392.
[8]张凤祥,朱合华,傅德明.盾构隧道[M].北京:人民交通出版社,2004.388-390.
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