基于流固耦合分析的地铁车站施工缝渗漏破坏特征研究

Leakage Characteristics of Subway Station Construction Joints Based on Fluid-solid Coupling Analysis

依托哈尔滨地铁人民广场站工程,采用数值计算分析方法,基于流固耦合分析理论,研究了地下水通过地铁车站施工过程中预留的施工缝渗透地铁车站结构内部的力学机理,分析了渗透过程中地铁车站应力、应变分布特征与孔压分布规律。研究表明:在地下水渗流与侵蚀作用下,孔压水透过车站施工缝侵入地铁车站结构,不仅致使地铁车站结构预留施工缝处产生较大孔隙水压力,而且较易导致在结构土体自重以及孔隙水压力共同作用下地铁车站结构的应力应变发生改变,从而引起地铁车站底板处发生渗漏破坏。因此,在实际工程中,应加强在施工缝处的防渗措施以及车站底板的加固措施。

By taking the Harbin Metro Peoples Square Station project as an example, this paper adopteds numerical calculation analysis method based on fluid-solid coupling analysis theory to analyze the mechanical mechanism of the penetration of groundwater through the subway station construction during the construction of the metro station. We also analyzed the stress, strain distribution characteristics and pore pressure distribution of metro stations during the infiltration process. Research results show that under the action of groundwater seepage and erosion,the pore water pressure invades the subway station structure through the construction joint of the station,which not only causes the large pore water pressure at the construction joint of the subway station structure,but also easily leads to the self-weight and pore water in the structural soil. Therefore,in the actual project,the anti-seepage measures at the construction joints and the reinforcement measures at the station floor should be strengthened.