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盾构隧道下穿既有城市隧道施工力学分析
引用本文:胡众,邵迅,姚华彦,张振华,朱大勇,袁海平.盾构隧道下穿既有城市隧道施工力学分析[J].四川大学学报(工程科学版),2016,48(Z2):52-59.
作者姓名:胡众  邵迅  姚华彦  张振华  朱大勇  袁海平
作者单位:合肥工业大学土木与水利工程学院,合肥工业大学土木与水利工程学院,合肥工业大学土木与水利工程学院,合肥工业大学土木与水利工程学院,合肥工业大学土木与水利工程学院,合肥工业大学土木与水利工程学院
基金项目:考虑空间效应的地基承载力理论与试验研究(51078123);滑坡运动过程研究与灾害评估(51179043)
摘    要:针对合肥地铁1号线盾构下穿南一环下穿隧道工程存在的安全风险,运用 FLAC3D实现了隧道盾构开挖的模拟,分析了盾构推进过程中下穿隧道结构以及在建隧道应力应变分布规律。研究表明:盾构机在监测断面前后20m范围内掘进对下穿结构竖向位移和拱顶沉降影响最大,处于盾构隧道上方及中心线上的监测点沉降变形较大;下穿隧道的底板南北侧出现拉应力,拉应力最大值达到1.088MPa。开挖结束,盾构隧洞周围土体最大隆起位移为6.22mm,最大沉降为4.96mm;最终两个隧洞周围土体位移分布规律基本一致。拱顶沉降随开挖的变化规律与监测点相似。根据模拟结果提出的施工防护措施有效,沉降实测值均在预警值以下,模拟结果与实测结果规律基本一致,模拟效果较好。

关 键 词:盾构隧道  下穿隧道  变形  应力
收稿时间:9/6/2015 12:00:00 AM
修稿时间:2015/12/30 0:00:00

Mechanics Analysis of Shield Construction Traversing Adjacently under Existing Urban Tunnel
huzhong,shaoxun,yaohuayan,and.Mechanics Analysis of Shield Construction Traversing Adjacently under Existing Urban Tunnel[J].Journal of Sichuan University (Engineering Science Edition),2016,48(Z2):52-59.
Authors:huzhong  shaoxun  yaohuayan  and
Affiliation:Hefei University of Technology,School of Civil Engineering, Hefei University of Technology,,,
Abstract:In allusion to the security risk of Hefei metro tunnel engineering during shield construction traversing adjacently under existing urban tunnel,adopting FLAC3D to simulate shield tunnel excavation, stress and strain distribution rules of the existing urban tunnel and shield tunnel during shield construction were analyzed. Research showed that: when shield machine before was processing before and after monitoring section in 10m ,the vertical displacement of urban tunnel and arch sedimentation were effected observably, urban tunnel settlement deformation of monitoring stations in the upper of shield tunnel and the centre of shield tunnels was large;tensile stress appeared in the south north of the bottom of the urban tunnel , the maximum tensile stress was 1.088MPa.After the excavation, the maximum uplift displacement of soil around the shield tunnel was 6.22 mm, the maximum subsidence was 4.96 mm;the distribution regularity of displacement of surrounding soil of two shield tunnel was similar.The protective construction measures were put forward according to results, the subsidence values measured were below the warning value, law of simulation results and measured results was similar,the simulation achieved good effect.
Keywords:shield tunnel  traverse adjacently under tunnel  deformation  stress
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