大拱脚台阶法在高速铁路浅埋隧道中的应用研究

由于隧道空气动力学效应,高速铁路隧道大多采用单洞双线断面,由此导致隧道的开挖断面增大,特别是对于浅埋隧道而言,其施工的技术难度和安全风险更为突出,选用合理的施工方案就显得非常重要。目前,关于大拱脚台阶法施工报道不多。结合某高速铁路浅埋隧道实体工程,采用数值模拟和现场测试方法,对大拱脚台阶法在浅埋高速铁路隧道中的应用进行深入系统研究。采用大拱脚台阶法安全顺利地完成该浅埋隧道施工,并且实测数据与数值模拟计算结果基本吻合,表明基于理论分析和数值模拟提出的施工方法是科学合理的。

APPLICATION STUDY ON BENCH METHOD WITH LARGE ARCH SPRINGING OF RAPID TRANSIT RAILWAY SHALLOW BURIED TUNNEL

For the aerodynamic effect,rapid transit railway tunnel usually has two-lane section with a single hole.Especially,the technique difficulty and security risks of a shallow buried tunnel excavation is very obvious;therefore,it is very important to choose a reasonable driving method for constructing the shallow buried tunnel.At present,construction study on bench method with large arch springing isn't very much.Based on a rapid transit railway shallow buried tunnel,by using the method of numerical simulation and site test,the application on bench method with large arch springing of rapid transit railway shallow buried tunnel was studied.The shallow buried tunnel construction was finished successfully,by the bench method with large arch springing and the measured data were basically consistent with numerical simulation results,which showed that the proposed construction schemes based on theoretical analysis and numerical simulation was scientific and reasonable.