群桩施工对邻近地铁隧道群位移的影响  

Influence of pile group construction on displacements of adjacent metro tunnels

作　　者：王其炎 吴健 杨飞 陈自海 杨建辉[2] WANG Qi-yan;WU Jian;YANG Fei;CHEN Zi-hai;YANG Jian-hui(Zhejiang Communications Construction Group Co.,Ltd.,Hangzhou 310051,Zhejiang,China;Zhejiang University of Science and Technology,Hangzhou 310023,Zhqiang,China)

机构地区：[1]浙江交工集团股份有限公司,浙江杭州310051 [2]浙江科技学院,浙江杭州310023

出　　处：《地基处理》2021年第5期420-426,共7页Journal of Ground Improvement

摘　　要：采用工程实测并结合ABAQUS有限元模拟的方法,对高速公路高架桥群桩基础施工引起的邻近既有地铁隧道群的水平和竖向位移规律开展了研究。表明群桩施工过程中,隧道群在水平面上的总体位移趋势是远离桩基,竖向位移趋势为沉降,随着埋深增大,水平位移量增大,沉降量越小,水平位移大于沉降量。桩基完成数量与当日位移量密切相关,当日成桩数量少,隧道位移量增长缓慢,反之位移增长较快。各测点的水平位移和竖向位移较小,大部分测点位移处于预警范围之内,全部小于报警值,说明全套管全回转钻机成孔群桩施工对隧道群扰动较小。The horizontal and vertical displacements of adjacent existing metro tunnels caused by the construction of the pile group foundation of an expressway viaduct were analyzed with in-situ monitoring data and ABAQUS FEM numerical simulation method in this paper.The study shows that during the construction of pile groups,the tunnel generally shows a trend away from the pile foundation in the horizontal direction displacement while the vertical direction displacement is downward.The greater the buried depth of the tunnel group,the greater the horizontal displacement and the smaller the vertical displacement in which the horizontal displacement is larger than the vertical one.The increasing rate of displacement is closely related to the number of pile foundations constructed on one day.The displacements of the tunnel group would change gently if the number of constructed piles on that day is relatively small while the displacement changes would be more pronounced for increasing pile numbers.The horizontal and vertical displacements of each measuring point are small,and most of the measured displacements are less than the warning values which indicates full casing rotary drilling construction of piles has little disturbance to the tunnel group.

关 键 词：群桩施工 地铁隧道 位移 全套管施工 

分 类 号：TU74[建筑科学—建筑技术科学]