某盾构隧道管片隆起成因分析与对策  

Cause Analysis and Countermeasure Study on Slab Uplift of a Shield Tunnel

作　　者：陈力华[1] 付军 

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400067 [2]中国葛洲坝集团三峡建设工程有限公司,湖北宜昌443000

出　　处：《公路交通技术》2017年第6期79-83,88,共6页Technology of Highway and Transport

基　　金：国家重点研发计划项目(2017YFC0806010)

摘　　要：某地铁盾构隧道贯通后,在其正上方进行房建基坑开挖过程中,突然出现了盾构管片上隆现象。为了查明盾构隧道管片上隆是否是受基坑开挖卸载影响所致,进行了数值模拟和现场分析。分析结果表明:在隧道覆土超过一定深度时,基坑开挖卸载对隧道变形影响较小;盾构隧道注浆不密实可能引起轨道上浮。为此,针对性地提出了该工程的处治对策,可为类似工程的处治提供经验。During a process of excavating foundation pit above the shield tunnel of a subway that has been put into service,shield slab uplift suddenly appears.Whether the unloading due to excavation causes the shield slab uplift is investigated through numerical simulation and field analysis.The results show that when the tunnel is covered by a certain thickness of soil,the unloading of pit excavation has relatively slight influence on the tunnel deformation,while that the grouting for shield tunnel is not dense may cause the tunnel to float upward.Therefore,suggestions are put forward for the treatment,which can provide a reference for similar projects.

关 键 词：盾构 基坑 隆起 地下水 卸载 

分 类 号：U459.3[建筑科学—桥梁与隧道工程]