双隧道开挖对地表沉降及地埋管线的影响研究  

Influence of twin tunnelling excavation onsurface subsidence and existing underground pipeline

作　　者：李志南 潘珂 王位赢 唐晓菲 马少坤[2,3,4] 段智博 LI Zhi-nan;PAN Ke;WANG Wei-ying;TANG Xiao-fei;MA Shao-kun;DUAN Zhi-bo(Guangzhou Metro Design&Research Institute Co.,Ltd.,Guangzhou 510010,China;College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China;Guangxi Key Laboratory of Disaster Prevention and Engineering Safety,Nanning 530004,China;Guangxi Communications Design Group Co.,Ltd.,Nanning 530029,China)

机构地区：[1]广州地铁设计研究院股份有限公司,广东广州510010 [2]广西大学土木建筑工程学院,广西南宁530004 [3]工程防灾与结构安全教育部重点实验室,广西南宁530004 [4]广西防灾减灾与工程安全重点实验室,广西南宁530004 [5]广西交通设计集团有限公司,广西南宁530029

出　　处：《广西大学学报（自然科学版）》2021年第3期588-597,共10页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(41362016)。

摘　　要：地铁建设中双隧道施工往往不是同步进行的,双隧道的布置间距及施工顺序的多样性将诱发复杂的地层响应,因此针对交叠双隧道施工对地层和管线的影响展开研究很有必要。以肩驮式双隧道开挖为研究对象,重点考虑开挖顺序和双隧道垂直间距不同时对地层和管线的影响机理。文章首先对比双隧道开挖对地埋管线的离心试验及数值分析的结果,验证了数值模拟的准确性和有效性。随后对双隧道开挖工况进行进一步数值拓展分析,着重研究了不同垂直间距及双隧道开挖顺序引起的地表沉降、管线竖向应变、土体剪应变和土体主应力的变化规律。研究结果表明,对于肩驮式双隧道,先上后下开挖时会产生较大的管线变形和地表沉降;随着双隧道垂直间距的增大,地表沉降和管线变形减小,但管线和周围土层受开挖影响的范围增大;当双隧道之间的垂直间距大于3.0D T时,双隧道之间的相互扰动效应基本消失。The construction of twin tunnels is often not synchronous.The diversity of twin tunnels arrangement and construction sequence will induce complex stratum response.Therefore,it is necessary to study the effect on strata and pipelines caused by overlapping twin tunnel excavation.This study takes the excavation of shoulder tunnels as the research object and mainly considersthe influence of different excavation sequence and vertical distance on twin tunnel.Firstly,the accuracy and effectiveness of the numerical simulation are verified against centrifugal test results of twin tunnels excavation.Then,further expansion of numerical simulationis carried out on the excavation conditions of twin tunnels.The variation laws of ground settlement,vertical strain of pipeline,shear strain and principal stress of soil caused by different vertical distance and excavation sequence are mainly studied.The results show that for the shoulder tunnels,when the tunnel is excavated first up and then down will lead to large ground settlement and pipeline deformation.With the increase of the vertical distance between the two tunnels,the ground settlement and pipeline deformation will decrease,but theaffectecdregion of the pipeline and surrounding soil caused by excavation will increase.When the vertical distanceis greater than 3.0 D T,the mutual perturbation effect between the two tunnels will largely disappear.

关 键 词：双隧道 数值分析 地表沉降 管线变形 

分 类 号：TU476[建筑科学—结构工程]