摘要
城市地铁盾构隧道掘进施工过程中由于超挖或注浆不到位容易产生地层损失,从而引起周边地层土应力的释放,使局部土体受扰动发生变形,以致影响既有建筑结构的安全.针对地铁选线过程中穿越高架桩基工况,基于有限元数值模拟方法,从桩体数量、隧道直径、隧道结构及隧道与基桩相对位置关系等角度分别进行敏感性状分析,结果表明:桩群数量变化下基桩的力学响应差异明显,群桩条件对隧道施工地层损失引发的地层位移具有较好的抗约束作用,但是隧道直径及其与邻近桥桩的空间相对位置对桩体的位移和内力影响较为显著.
Over-excavation or inappropriate grouting of shield tunnel construction is more likely to cause ground loss,leading to release of geostatic stress which contributes to disturbance of regional earth soil, and threatening the safety of existing buildings and infrastructures. In the conditions of metro line passing through elevated pile foundation, this paper conducted a parametric analysis on pile numbers, tunnel diameter and the clear spacing between tunnel and pile by using numerical simulation method. The results show that the mechanical performance of piles varies significantly and group pile effect can significantly lessen the influence of ground loss, and the tunnel diameter and the clear spacing between tunnel and pile exert a significant effect on displacement and internal forces.
作者
王栓
郑晓飞
吕伟华
WANG Shuan;ZHENG Xiao-fei;LYU Wei-hua(The Nanjing Engineering Company of CCCC Tunnel Engineering Co.,Ltd.,Nanjing 210007,China;School of Civil Engineering,Nanjing Forestry University,Nanjing 210037,China)
出处
《南京工程学院学报（自然科学版）》
2018年第2期36-43,共8页
Journal of Nanjing Institute of Technology(Natural Science Edition)
基金
国家自然科学基金项目(51508279)
江苏省自然科学基金项目(BK20150885)
关键词
盾构隧道
桩
力学响应
参数敏感性分析
shield tunnel
pile
mechanical performance
parameter sensitivity analysis
作者简介
王栓，工程师，研究方向为地下工程施工技术．E-mail：329603741@qq．com
