摘要
以北京地铁10号线光华路站为工程背景,根据车站中洞标准断面设计图和工程地质情况,采用有限元软件ANSYS建立其三维仿真计算模型,进行洞桩法施工过程中桩基础结构受力、周围地层土体的应力、位移变化以及地表沉降研究。结果表明:在地铁车站洞桩法整个施工阶段引起的地表沉降累计为14.8 mm,说明合格的桩基础可以将地表沉降量控制在小于30 mm规范要求之内;上部拱部土体开挖阶段引起的地表沉降量为6.7 mm,占地表沉降总量的45.0%,说明拱部开挖是整个施工过程的关键环节;施工过程中要加强拱顶超前管棚的等级和及时性,采取有效措施对拱部地层进行预加固或预支护处理,有效控制地表沉降和保证施工安全。
Based on the engineering background of Guanghua Road Station on Beijing Metro Line 10,this paper mainly concentrates on the culvert pile method＇s relevant situation,builds a relatively accurate three dimension virtual calculation model using the great finite element software ANSYS. Study was conducted on the stress change of pile foundation,stress-displacement change of the surrounding soil mass and ground surface subsidence in the course of culvert pile method construction.The results indicate that,firstly,the total surface subsidence during the whole construction process of the culvert pile method is 14.8 mm.It means that qualified pile foundation can control the ground surface subsidence under 30 mm which meets the requirement of standard.Secondly,the surface subsidence during the excavation stage of upper arch soil mass is 6.7 mm,which takes 45% of the total surface subsidence.It means that the excavation of arch soil mass is the key stage of the whole construction process.Thirdly,the grade and betimes of vault pipe-shed advance support should be heightened,and effective measures should be taken to pre-reinforce or pre-support the vault soil mass during construction,which can effectively control ground surface subsidence and ensure construction safety.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2011年第4期60-65,共6页
China Railway Science
基金
"十一五"国家科技支撑计划资助项目(2006BAB02A02)
关键词
地铁车站
施工
洞桩法
桩基础
地表沉降
Subway station
Construction
Culvert pile method
Pile foundation
Ground surface subsidence
