地下人行通道施工对地铁车站变形分析

Analysis of the Deformation of Metro Station Caused by Approaching Excavation of the Link Pedestrian Tunnel

拟建浅埋暗挖地下连接通道将既有地铁车站和地下商场通道连通,该连接通道与地铁车站的距离较近且地质条件较差。为了预测该地下连接通道的修建中不同的开挖方式以及注浆加固与否对地面沉降及对地铁车站结构变形的影响,采用数值模拟的方法,在全断面开挖的情况下,对是否采取注浆加固的效果进行比较;在注浆加固的情况下,对全断面开挖、近端到远端分部开挖及远端到近端分部开挖进行比较。从地表位移和车站结构变形的角度进行分析,根据分析结果可知,采用注浆加固土体,选择从远端至近端分部开挖及断面上先开挖离车站近侧再远侧土体等措施,可有效减少地面沉降及车站结构的变形,保证施工安全顺利地进行。

The link pedestrian tunnel will be constructed to connect the underground store and the subway station.Because of the link pedestrian tunnel is close to the subway station and the surrounding rock,which the tunnels will pass by,is weak.So the numerical simulation analysis is needed to predict the deformation of the subway station and ground subsidence.The paper compares the effect of grouting or without grouting in case of the whole section excavation and estimates the effect of full section excavation and partial excavation in case of grouting.From the perspective of the ground subsidence and deformation of subway station,the analysis result shows that grouting,partial excavation from far to near and so on are the best be used.These measures can reduce the ground subsidence and deformation of subway station and ensure that the tunnel constructed safely and successfully.