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结合重庆轨道交通6号线最大开挖断面428m2的礼嘉车站,对大断面轨道交通换乘车站的施工方法进行了研究,并通过数值模拟的方法对双侧壁导坑法、CD法和中岩柱单边落地施工方法进行了比较。通过对拱顶位移、洞周收敛、地表沉降、围岩塑性区等各方面的综合比较分析,表明:采用中岩柱单边落底施工方法对大断面轨道交通换乘车站是可行的;采用中岩柱单边落底施工的关键步序为上部2台阶的开挖,以及中岩柱的拆除。
Combined with the 428m2 station of Lijia, the largest excavation section of Chongqing Rail Transit Line 6, the construction method of large-section rail transit station was studied. The numerical simulation method was used to study the construction of double- Column unilateral landing construction methods were compared. Through the comprehensive comparison and analysis of the dome displacement, the convergence of the cave, the surface subsidence and the plastic zone of the surrounding rock, it shows that it is feasible to use the single rock bottom-bottom construction method to transfer the large-section rail transit station; The key steps in the unilateral rock bottom construction are the excavation of the upper two steps and the removal of the middle rock columns.