盾构隧道施工中土灵敏度分析  

A Study on the Soil Sensitivity of Shield Tunnel Construction

作　　者：李冀伟[1] 李岳[1] 刘园[1] 

机构地区：[1]西安科技大学建工学院,西安710054

出　　处：《工业安全与环保》2012年第11期57-59,共3页Industrial Safety and Environmental Protection

摘　　要：以西安地铁二号线某区间隧道工程为依托,根据实际的地质情况,运用FLAC3D数值仿真模拟软件以隧道掘进面洞顶沉降为衡量标准,对隧道变形受土体各参数影响的灵敏度进行模拟分析,找出主要影响参数,使施工中对隧道周围土体的变形控制更有针对性。研究表明,土体的弹性模量为主要影响参数,其次为内摩擦角和黏聚力,各参数的变化对隧道周围土体变形的影响是由强至弱的。各参数变化对隧道变形影响趋势基本一致,且土体参数越好,参数变化对隧道变形的影响越不敏感,所以改善提高围岩参数可以有效地增加隧道的稳定性。Based on a subway transit tunuel of Xi＇ an Subway Line 2 and the actual geological condltions, this thesis aims to employ FLAC3D numerical simulation to analyze the sensitivity of the tunnel＇ s deformation changing with soil parame- ters and identify the main influencing parameters, with the subsidence of the crown tunnel as its reference point. It is target- ed to serve for the deformation control of the surrounding soil. Studies have shown that the soil＇s elastic modulu~ is the main influencing parameter which is followed by the angle of internal friction and cohesion. The influence of the parameters＇ change on the deformation of the tunnel＇s surrounding soil decreases gradually. Furthermoro, the influence of tha parame- ters＇ change on the tunnel deformation is basically the same. The better the soil parameters, the less sensitive the influence of the parameters＇ change on the tunnel deformation. Therefore, the improvement of the rock mass parameters can effective- ly increase the stability of the tunnel.

关 键 词：盾构 FLAC3D 灵敏度分析 施工优化 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]