摘要
基于地铁车站PBA工法施工实例,采用数值模拟方法分析给出了控制沉降变形的关键工序,总结了施工过程中采取的一系列施工措施和地下管线保护措施,通过施工监测揭示了沉降规律及变形控制重点.主要结论如下:1)PBA暗挖地铁车站施工沉降主要发生在小导洞开挖和扣拱施工阶段,这两个阶段是控制地表沉降的关键阶段;2)通过全断面注浆和后背回填注浆加固拱顶和管线之间的土体,可减少开挖后由于上部土体松散造成的沉降,有利于地下管线的保护;3)导洞开挖阶段和扣拱阶段地表累计沉降量分别为总控制值的55%和80%,是变形控制的重点.
Based on a construction case of metro station built by PBA method, the key processes of control- ling settlements and deformations are given by numerical simulation method. Meanwhile, the pipeline and structure protection measures in the construction process are summarized; and then the settlement regular pattern and key deformation control procedures are revealed through the construction monitoring. The main conclusions are as follows. 1） The numerical simulation shows that the settlements caused by PBA method occur in the construction stage of the small pilot tunnel and supporting arch, which is a critical stage for the surface subsidence control. 2） The loose soil between the arch and the pipeline is reinforced by whole section and back backfill grouting, so that the settlements are reduced effectively. 3） The settle- ments accompanying the pilot tunnel excavation and the supporting arch construction are accounted for 55% and 80% of the total control value which are the key point of deformation control.
出处
《武汉大学学报（工学版）》
CAS
CSCD
北大核心
2016年第6期893-898,910,共7页
Engineering Journal of Wuhan University
基金
国家自然科学基金重点项目(编号:51538001)
北京市自然科学基金项目/北京市教育委员会科技计划重点项目(编号:KZ201410005007)
关键词
PBA工法
地铁车站工程
数值模拟
监控量测
风险管控
PBA method
metro station
numerical simulation
monitoring measurement
risk manage-ment and control
