双线隧道施工引起的地表沉降变形及其控制措施研究

Study on the ground settlement and deformation caused by the construction of double-track tunnel and its control measures

近年来,随着施工技术的进步,地铁建设项目逐年递增,但地铁建设过程中产生的问题也逐渐被人们所重视,如施工范围内地表沉降、施工周边建筑物倾斜坍塌及地面塌陷等,严重威胁在建区域内民众生命财产安全。因此,针对地铁隧道施工环节地表沉降进行研究具有重要意义。文章依托西安地铁某线路隧道开挖工程,结合现场实测数据及MIDASGTSNX软件数值模拟,研究双线隧道开挖引起的沉降变化规律。现有数据模拟结果表明,采取当前处理措施,最大沉降量将超出预警值,可达43.3mm。基于此,提出合理的预加固沉降控制措施,以期为类似地铁建设提供参考。

In recent years,with the progress of construction technology,metro construction projects have increased year by year,but people have gradually paid attention to the issues arising from metro construction,such as surface settlement within the construction scope,inclined collapse of buildings around the construction and ground collapse,which seriously threaten the safety of people's lives and property in the construction area.Therefore,research on the surface settlement of metro tunnel construction is of great significance.Based on the tunnel excavation project of Xi'an metro,combined with the field measured data and numerical simulation with MIDAS GTS NX software,this paper studies the settlement change laws affected by the excavation of double-track tunnel.According to the existing data,the simulation results show that by using the current treatment measures,the maximum settlement will exceed the early warning value,up to 43.3 mm.Based on this,this paper puts forward reasonable pre reinforcement settlement control measures,which plays an important role in metro construction.