壁后注浆对盾构隧道管片及地表变形的影响分析

Analysis on Effect of Wall Grouting on Shield Tunnel Segments and Surface Deformation

地下工程质量不仅包括成型构建空间尺寸、结构强度、连接节点质量等常规质量问题,还包括施工对环境的影响问题。地下工程质量事故很难像地面结构进行施工过程控制、事后处理,必须在施工前分析、确定施工工艺参数,施工中控制、调整工艺参数,最大程度降低对环境影响,确保工程质量。本文以合肥地铁长江西路段某区间隧道施工工程为背景,建立了模拟隧道开挖的三维力学模型,通过软件进行数值模拟,分析盾构施工中注浆对地表及管片变形的影响,并依据地表沉降和管片变形调整注浆压力。

It is unavoidable that shield tunneling and surface deformation will occur during the shield construction process.According to the construction of a section of a certain tunnel in the Changjiang section of the Hefei subway,a three-dimensional mechanical model of the tunnel excavation is established in this paper.The numerical simulation using MIDAS (GTS) software is carried out to analyze the influence of grouting on the deformation of the surface and the segments in the shield construction.The results show that grouting has a certain influence on the deformation of the segment and the surface and needs to be controlled during the construction process.