摘要
以宁波市地铁1号线东环南路站基坑工程为研究对象,分析了基坑工程围护结构变形和外围地表沉降的变化规律.结果表明,基坑开挖对围护结构变形及外围土体沉降的影响具有明显的时间效应,施工过程中应严格控制深层土体的开挖时间,并需要及时架设支撑及浇注混凝土底板.同时,结合有限元数值计算和位移转化系数的方法推算了考虑软土强蠕变性的基坑变形长时位移,所得结果与其监测结果相吻合,从而验证了所采用的监测方法的可行性.
In order to investigate the effect of soft soil with strong creep resistance on the deformation dur- ing construction, based on the foundation pit engineering of the South East Outer Ring Road Station in Ningbo, the deformation of the building envelope and the external surface subsidence were analyzed. The results show that the effect of the foundation excavation on the deformation of the building envelope and the external surface subsidence has an obvious time effect. So the time of deeper soil excavation should be strictly controlled followed by timely erection of support and pouring of concrete floor. Meanwhile, the de- formation and long-term displacement of the pit were calculated by combining the finite element modeling （FEM） with the displacement aging coefficient and taking the strong creep resistance into account. The numerical results conform to the monitored results, which verifies the feasibility of the method, and pro- vides reference for similar excavation engineering.
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2013年第9期1413-1418,共6页
Journal of Shanghai Jiaotong University
关键词
软土
基坑工程
强蠕变性
有限元建模
长时位移
soft soil
excavation engineering
high creep property
finite element modeling （FEM） simula- tion
long-term displacement
