盾构掘进对邻近桩基影响及托换桩加固效果分析  

Analysis of Tunneling-induced Responses of Adjacent Pile Foundations and the Strengthening Effects of Underpinning Piles

作　　者：赵文艺[1] 翟世鸿 蒲诃夫[1] 郑俊杰[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074 [2]中交集团第二航务工程局有限公司,湖北武汉430014

出　　处：《华中科技大学学报（城市科学版）》2010年第3期11-15,共5页Journal of Huazhong University of Science and Technology

基　　金：新世纪优秀人才支持计划(NCET-06-649);中交集团2008年科技攻关项目(08-QS-11);武汉市科技攻关计划项目(200860423194)

摘　　要：以广佛线地铁菊村至西朗区间盾构隧道下穿某车库桩基为背景,利用有限差分软件建立相应的三维仿真计算模型,分析盾构掘进引起的地层位移及邻近桩基的变形,并对桩基托换加固方案的加固效果进行了研究,对桩基托换的主要影响参数进行了讨论。结果表明:在上软下硬复合地层中,桩基托换法可以有效地降低盾构施工对邻近既有桩基的影响,托换桩桩长与既有桩基沉降呈非线性关系。When shield tunnel underneath passes through the pile foundation of a structure, the relevant nu- merical simulation models are established by finite difference code to study the tunneling-induced ground movement and deformation of adjacent pile foundations. The strengthening effects of underpinning scheme and its parametric studies are also carried out. The results show that the influence of tunneling on the adjacent pile foundations can be effectively reduced by underpinning in complex soil strata. The relationship between the length of the underpinning pile and the settlement of the existing piles is found to be nonlinear.

关 键 词：盾构隧道 桩基 托换 数值模拟 复合地层 沉降 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]