城市地铁隧道对结构物上部桩基的影响  

Effect of metro tunneling traversing on super-pile

作　　者：朱逢斌[1] 杨平[2] 佘才高 

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,江苏南京210037 [3]南京地铁有限责任公司,江苏南京210000

出　　处：《南京林业大学学报（自然科学版）》2009年第6期108-112,共5页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：江苏省"青蓝工程"中青年学术带头人培养计划(2004)

摘　　要：通过三维弹塑性有限元模型的建立,探讨软土地区盾构隧道开挖对地表沉降及上部桩基工作性状的影响规律。结果表明:地表沉降随盾构隧道开挖深度的增大而减小,而发生地表沉降范围增大;当桩体位于隧道拱顶正上方时,桩端与隧道拱顶间的最小安全距离为0.5d(d为隧道直径);盾构隧道开挖在其侧上方引起的影响区为距离隧道中心线1d的范围。A 3D elasto plastic finite element model was established, and a detailed discussion was made on the influence caused by tunneling to ground settlement and super-pile. The results showed that the ground settlement which occurs in larger scope would reduce with the increasing of shield tunnel excavation depth. If the pile existed just at the upside of shield tunnel crown, the minimum safe distance between pile toe and shield tunnel crown would be half tunnel diameter. The lateral up influenced zone due to tunneling was one tunnel diameter from tunnel centerline.

关 键 词：地铁隧道 上部桩基 水平位移 弯矩 沉降 轴力 

分 类 号：U452[建筑科学—桥梁与隧道工程]