软土区基坑开挖对邻近电缆隧道的影响研究  

Study on the influence law of soft soil foundation pit construction on adjacent cable tunnels

作　　者：贺雷 张亚楠 曹明洋 胡超 陈竞 HE Lei;ZHANG Yanan;CAO Mingyang;HU Chao;CHEN Jing(Power Transformer Engineering Research Institute,China Electric Power Research Institute,Beijing 102401,China;CCCC Investment Co.,Ltd.,Beijing 100011,China;Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]中国电力科学研究院有限公司输变电工程研究所,北京102401 [2]中交投资有限公司,北京100011 [3]同济大学地下建筑与工程系,上海200092

出　　处：《建筑结构》2020年第S01期1032-1037,共6页Building Structure

基　　金：中国电力科学研究院有限公司创新基金项目(GC83-18-002)

摘　　要：通过有限元模拟和离心机模型试验研究了软土地区基坑开挖对邻近土体与既有电缆隧道的影响。首先,基于PLAXIS2D有限元软件,构建有限元计算模型,探讨软土地区基坑开挖对既有电缆隧道的影响规律;其次,通过离心机物理模型试验,对基坑开挖引起的地层变形、挡墙变形以及隧道的影响都进行了定性分析;最后,以计算模型为例,对电缆隧道周围进行了安全区划分。计算结果表明:基坑开挖将导致既有电缆隧道产生明显的位移,基坑开挖深度和基坑与电缆隧道的间距是造成隧道位移和衬砌结构内力的改变的主要因素;随着基坑与电缆隧道间距的增加,隧道保护黄线区的范围逐渐增大而保护红线区的范围逐渐减小。研究结果可为有临近基坑施工时既有隧道的保护提供参考。The influence of foundation pit excavation on adjacent soil and existing cable tunnel in soft soil area was studied by finite element simulation and centrifuge model test.Firstly,based on the PLAXIS2 D finite element software,the finite element calculation model was constructed to explore the influence law of foundation pit excavation on existing cable tunnel in soft soil area;secondly,the formation deformation,retaining wall deformation and tunnel influence caused by foundation pit excavation were qualitatively analyzed by centrifuge physical model test;finally,the safety zone around the cable tunnel was divided by taking the calculation model as an example.The calculation results show that the excavation of foundation pit will lead to obvious displacement of existing cable tunnel,and the excavation depth and the distance between foundation pit and cable tunnel are the main factors that cause the change of tunnel displacement and internal force of lining structure The results can provide reference for the protection of existing tunnels in the construction of adjacent foundation pit.

关 键 词：软土地区 顶管电缆隧道 基坑开挖 数值分析 离心机模型试验 

分 类 号：TM75[电气工程—电力系统及自动化] TU753[建筑科学—建筑技术科学]