暗挖隧道下穿既有铁路站场实施方案设计

Implementation Plan Design for Mined TunnelCrosses under Existing Railway Yard

以重庆市九龙坡区市政隧道下穿铁路站场为依托,通过数值模拟与现场实测相结合的方法,按实际情况,对下穿暗挖隧道过站区施工过程进行模拟,对下穿隧道施工过程中引起既有铁路站场变形及控制措施开展研究,对既有铁路变形进行评价,得出适用于该工程地质的控制措施,使新建隧道在保证铁路正常运营及安全下,下穿既有铁路站场。

Based on the underpass railway yard of a tunnel project in Jiulongpo District in Chongqing,this paper simulates the excavation process of the underpass area according to the actual excavation sequence and construction technology through the combination of numerical simulation and field measurement.From the perspective of construction mechanics mechanism analysis,the deformation and control measures caused by the existing railway yard during the construction of the underpass tunnel are studied.By evaluating the deformation of the existing railway,the control measures suitable for the engineering geology are obtained,so that the new tunnel can pass through the existing railway yard under the guarantee of the normal operation and safety of the railway.