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隧道工程二次衬砌施作时机是隧道界普遍关注的问题。依托正在修建的郑州—西安铁路客运专线大断面黄土隧道工程,以围岩及初期支护基本稳定速率作为二次衬砌施作时机判定指标,采用位移断面监测数据回归分析和数值分析相结合,建立基本稳定速率的理论求解方法,从而确定二次衬砌施作时机;同时,选取贺家庄隧道试验段作为工程实例,对高速铁路大断面黄土隧道二次衬砌施作时机进行研究。研究结果表明:当拱顶下沉变形速率值小于0.55 mm/d,边墙水平绝对收敛速率值小于0.11 mm/d时,即可进行二次衬砌施作。此次研究为类似工程的设计和施工提供了参考依据。
Tunnel lining construction of the second time is the tunnel industry, the general concern. Based on the large-section loess tunnel project under construction in Zhengzhou-Xi’an Railway Passenger Dedicated Line, the surrounding rock and the initial steady rate of initial support are taken as the timing indicators to determine the timing of the secondary lining. The regression analysis and numerical analysis of displacement section monitoring data are combined to establish The basic stability rate of the theoretical solution to determine the timing of the second lining; the same time, select the Hejiazhuang tunnel pilot section as an example of engineering, high-speed railway on the second section of large-section loess tunnel lining construction timing. The results show that when the crown deformation rate is less than 0.55 mm / d and the absolute horizontal convergence rate is less than 0.11 mm / d, the secondary lining can be applied. This study provides a reference for the design and construction of similar projects.