山区城市轨道交通区间隧道下穿既有铁路施工优化分析

Optimization Analysis of Construction of Tunnel Undercrossing Existing Railways in Urban Rail Transit Sections in Mountain Areas

为确保既有运营铁路的运营安全,研究山区城市轨道交通区间隧道下穿既有铁路施工方法及施工参数优化十分必要。通过施工方案比选,建立隧道下穿既有运营铁路3D数值模型,研究不同工况下铁路路基、隧道围岩的沉降规律、围岩应力的演化规律、支护结构的受力特征。在此基础上,通过不同工况方案的对比分析,选择优化施工方案。结果表明,按优化方案施工,区间隧道施工既保证既有铁路安全运营,又能提高施工效率。这可为类似工程施工提供参考。

To ensure the operational safety of existing operating railways,it is necessary to study the construction methods&optimization of construction parameters for tunnels under existing railways in mountainous urban rail transit.By comparing&selecting construction plans,establish a 3D numerical model for tunnel underpass through existing operating railways,and study the settlement law of railway roadbed and tunnel surrounding rock under different working conditions,the evolution law of surrounding rock stress,and the stress characteristics of support structures.On this basis,through comparative analysis of different working conditions,an optimized construction plan is selected.The results indicate that according to the optimized construction plan,the construction of interval tunnels not only ensures the safe operation of existing railways,but also improves construction efficiency,which may provide reference for similar engineering construction.