地铁望城坡站附属结构改造设计的数值分析

Numerical Analysis on Design of Protection Measures for Ancillary Structures of Wangchengpo Metro Station

长沙地铁2号线望城坡站建设先于大河西交通枢纽工程中心,交通枢纽工程中心与望城坡站附属2号风道与Ⅲ号出入口结合部位考虑进行合建。因此,交通枢纽施工前需要对望城坡站附属2号风道与Ⅲ号出入口结构进行改造。为研究改造措施的合理性,采用有限元分析软件ANSYS,对施工过程进行模拟。通过对地铁附属结构改造前后周边位移、内力的变化进行对比分析,确定采取桩顶连梁将围护桩、出入口结构和风道连成一个整体,以增强车站附属结构的整体性。得出结论如下:改造工程主要是对出入口通道结构进行保护;由于围护桩的隔离作用,不需要对风道进行保护。

Wangchengpo station on line 2 of Changsha Metro is built before the Grand Hexi Transportation Center Project is planned. The Grand Hexi Transportation Center Project is to be integrated with No. 2 ventilation passage and No. 3 entrance/exit passage of Wangchengpo Metro station. Therefore, protection measures should be taken for No. ：2 ventilation passage and No. 3 entrance/exit passage of Wangchengpo Metro station before the construction of the Grand Hexi Transportation Center Project is started. The execution of the protection measures for the ancillary structures is simulated by means of FE analysis program ANSYS, so as to study the rationality of the protection measures. The surrounding displacement and internal forces of the ancillary structures of the Metro works before and after taking protection measures are analyzed and it is dete^nined that connection beams should be installed along the top of the retaining piles to transform the retaining piles, entrance/exit passage and ventilation passage into an integral structure, so as to improve the integrality of the ancillary structures of the Metro station. Conclusion is drawn that the protection shouht be focused on the entrance/exit passage structure and that, due to the separation effect of the retaining piles, the ventilation passage needs no protection measures.