盾构隧道开挖对邻近桩基影响研究  

Research on the Influence of Shield Tunnel Excavation to Neighboring Single Pile

作　　者：朱逢斌[1] 杨平[2] 林水仙 

机构地区：[1]苏州科技学院土木工程学院,江苏苏州215011 [2]南京林业大学土木工程学院,南京210037 [3]亚东工业(苏州)有限公司,江苏苏州215128

出　　处：《地下空间与工程学报》2010年第2期369-374,共6页Chinese Journal of Underground Space and Engineering

基　　金：苏州科技学院院基金项目(340911103);江苏省"青蓝工程"中青年学术带头人培养计划项目(2004)

摘　　要：通过采用Mohr-Coulomb弹塑性屈服准则,建立三维有限元数值模型,系统研究盾构隧道开挖引起的邻近单桩工作性状的变化规律。数值模拟结果表明,当隧道在距桩轴线0.5倍隧道直径的范围内推进时,邻近单桩水平位移、弯矩、轴力的变化最为明显;当桩端位于隧道拱底深度上方时,盾构隧道开挖对邻近单桩变形影响较大,而当桩端超过隧道拱底深度时,邻近单桩内力受开挖影响较大。By using Mohr-Coulomb yield criterion, a three dimensional numerical model is established, and the changing law of behaviors of the pile due to tunnel excavation is studied profoundly. According to the results of numerical simulation, when the shield tunnel propels a distance of half tunnel diameter to neighboring single pile, the horizontal displacement, moment, axial force of the pile change notably. If the pile tip lies above the bottom of tunnel arch, the influence caused by excavation of shield tunnel on the deformation of pile is more significant than by the internal force, while the pile tip exceeds the bottom of tunnel arch, the situation is just opposite.

关 键 词：盾构隧道 单桩 水平位移 弯矩 轴力 沉降 

分 类 号：U452[建筑科学—桥梁与隧道工程]