大断面暗挖车站施工工法优化比选研究

Study on optimization comparison and selection of construction methods for large section mined station

通过对深圳地铁8号线一期工程深外高中站2种大断面暗挖法(即九步开挖的双侧壁法和台阶法)不同的施工工序进行数值模拟模型比选分析,选择能够较好适应车站不同的地质条件,满足安全施工的施工工序,为现场施工提供指导。结合施工监测数据可知,施工过程的拱顶沉降和水平收敛实测值与数值模拟计算所得的结果较为接近,从而验证数值模拟的合理性,以及2种方法施工工序的地质条件适应性。

Through the comparison and analysis of two different construction processes of the super large section mining method in Shenzhen foreign language high school station of Shenzhen metro line 8 phase I project,the double sidewall method and bench method of nine-step excavation were analyzed by numerical simulation.Construction processes adapted to different geological conditions of the station and ensuring construction safety were selected to provide guidance for on-site construction.Combined with the construction monitoring data,the vault settlement and horizontal convergence value in the construction process verified the rationality of numerical simulation and the adaptability of geological conditions of the construction steps of double sidewall method and bench method of nine-step excavation method.