地铁车站密贴下穿既有综合管廊设计措施研究

Research on Design Measures of Subway Station Closely Crossing Under Existing Utility Tunnel

成都轨道交通30号线一期工程银玉路站与玉虹路综合管廊垂直相交,车站主体结构位于综合管廊下方,车站宽19.9 m,玉虹路综合管廊最大宽度12.2 m,车站顶板与综合管廊底板密贴,玉虹路综合管廊已建成投入使用,车站下穿综合管廊采用原位保护方案。采用迈达斯软件进行分析计算,通过数值模拟分析,对设计方法、设计措施等开展研究,研究结果表明:采用类似桩基托换的方法原位保护综合管廊,最大位移9.87 mm,满足变形控制标准;带燃气舱的综合管廊与地铁车站密贴,支撑梁采用永临结合,车站整体造价低;对于有变形缝的综合管廊原位保护,先对管廊结构进行支顶,在管廊下方开挖3 m,类似洞桩法的施工方法,能有效防止差异沉降。

Yinyu Road Station of Chengdu Rail Transit Line 30 Phase I Project is vertically intersected with Yuhong Road utility tunnel.The main structure of the station is located below the utility tunnel.The width of the station is 19.9 m,and the maximum width of Yuhong Road utility tunnel is 12.2 m.The top plate of the station is closely attached to the bottom plate of the utility tunnel.Yuhong Road utility tunnel has been completed and put into use.The station passes through the utility tunnel using the in-situ protection scheme.The Midas software is used for analysis and calculation.Through numerical simulation analysis,research on design methods and measures is studied.The research results show that the method similar to pile foundation underpinning is used for in-situ protection of the comprehensive utility tunnel has a maximum displacement of 9.87 mm,which meets the deformation control standard.The utility tunnel with gas tank is closely attached to the subway station,and the support beam is permanent and temporary,so the overall cost of the station is low.For the in-situ protection of the utility tunnel with deformation joints,the utility tunnel structure is supported first,and 3 m is excavated below the utility tunnel,it is similar to the construction method of pile-beam-arch method,which can effectively prevent differential settlement.