新建隧道盾构下穿施工对既有隧道影响的三维数值模拟  

3-D numerical simulation of influence of undercrossing shield construction on existing tunnel

作　　者：房明[1,2] 刘镇[1,2] 周翠英[1,2] 史海欧[3] 

机构地区：[1]中山大学工学院 [2]中山大学岩土工程与信息技术研究中心,广东广州510275 [3]广州市地下铁道设计研究院,广东广州510010

出　　处：《铁道科学与工程学报》2011年第1期67-72,共6页Journal of Railway Science and Engineering

基　　金：国家高技术研究发展计划项目(863计划)(2007AA11Z112);国家自然科学基金项目(40672194);高等学校博士学科点基金项目(20060558060);广东省自然科学基金重点项目(06104932);中山大学后备重点课题(1132169)

摘　　要：采用三维有限元方法对新建隧道盾构下穿施工过程进行了动态模拟,分析了新建隧道盾构正交下穿施工对既有隧道位移、应力的影响;进而探讨了不同的隧道覆土厚度、隧道间相对距离及土体强度下,新建隧道盾构正交下穿施工对既有隧道位移的影响。结果表明:新建隧道盾构正交下穿施工引起既有隧道位移方向朝向新建隧道方向发展,既有隧道位移以纵向沉降为主,沉降曲线符合正态分布;盾构下穿引起的既有隧道正应力变化较大;隧道覆土厚度、隧道间相对距离和土体强度对隧道间相互作用有较大影响,应引起足够的重视。By means of 3D-FEM,the construction process of undercrossing construction is simulated and the influence of shield tunneling on settlement of the ground surface and displacement and internal forces of the existing tunnel are analyzed.Then,the influence of undercrossing construction on displacement of the existing tunnel under different covering soil condition is studied.The results show that the displacement of the existing tunnel caused by shield tunneling points to the new tunnel,the major of the existing tunnel displacement is longitudinal settlement which is normal distribution,and the normal stress of the existing tunnel have a great change.The thickness of overlay soil,the net distance between the tunnels and the compression modulus of soil have great influence on the interaction between tunnels.

关 键 词：交叉隧道 盾构 下穿 三维有限元分析 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]