地铁隧道旁通道冻结法施工监测分析

Monitoring Analysis of Construction for Connecting Aisle in Metro Tunnel with Freezing Method

研究目的:在城市隧道施工过程中,地表变形的大小往往成为决定施工成败的关键因素之一。通过对地表变形、冻胀压力、卸压孔压力等进行监测分析,合理设定冻结参数,减小地表变形,保证施工质量。研究结论:以上海轨道交通10号线2标段旁通道冻结法施工为例,对地表变形、冻胀压力、卸压孔压力等方面进行了跟踪监测;并对监测结果进行分析研究。分析和监测数据验证,合理设定冻结时间、冻胀压力等参数,建立有效的土压平衡,即可将各项变形控制在规定的范围内。

Research purposes：The deformation of the ground surface is essential to the successful construction of tunnel in city.The freezing parameters should be decided rationally through making analysis of the deformation of the ground surface,the expanding and releasing pressures for the purposes of establishing effective soil pressure balance,reducing the deformation of the ground surface,and guaranteeing construction quality.Research conclusions：Taking the connecting aisle construction of bidding 2 of Line 10 of Shanghai metro as an example,the deformation of the ground surface,the expanding and releasing pressures in the soil were monitored on the site and monitored data are analyzed in this paper.The monitored data and analysis results show the deformations can be controlled in the prescribed limit if the parameters of freezing time,expanding pressures are defined rationally and an effective soil pressure balance is established.