浅析坡地地铁高架车站的基础设计

结合实际工程案例,研究坡地地铁高架车站的基础结构设计方案,以减少前期场坪及临时边坡的处理费用。依据建筑及铁路行业规范,利用Midas有限元软件建立2层地铁高架车站的三维数值模型,分析设防烈度为7度、抗震等级为一级的地铁高架车站基础设计。分析结果表明:既有坡地采用坡率1∶1.25的多级放坡浆砌片石刷坡处理,边坡稳定性满足规范要求。车站基础采用柱与桩直接连接的吊脚结构基础,嵌固端取为桩顶,保证其上部结构具有一定的安全储备。桩基则依据边界条件进行分段受力验算,加强其强度及延性设计,并保证足够的嵌固深度穿透滑裂面,可满足工程安全要求,减少前期场地及边坡的处理费用,降低施工风险,缩短施工工期。

Analysis on the Foundation Design of Urban Rail Transit Elevated Stations in Sloping Terrain

Combined with practical engineering cases,this paper studies the foundation structure design of the elevated station on sloping ground to reduce the cost of field leveling and temporary slope treatment in the early stage.According to the construction and railway industry norms,the three-dimensional numerical model of the 2-storey subway elevated station is established by using Midas finite element software.The foundation structure design of the subway elevated station with a fortification intensity of 7 degree and first grade earthquake resistance is analyzed.The analysis results show that the existing slope is treated with 1:1.25 multi-level sloping mortar rubble,and the slope stability is up to the standard requirement.The station foundation adopts the suspension structural foundation with the direct connection of column and pile,and the fixed end is taken as the pile top,which ensures that its superstructure has a certain safety reserve.According to the boundary conditions,the pile foundation is checked and calculated in sections to strengthen its strength and ductility design and ensure that enough embedded depth penetrates the slip surface,which can meet the engineering safety requirements,reduce the cost of the pre site and slope treatment,reduce the construction risk and shorten the construction period.