隧道埋深对二衬合理支护时机影响分析

Analysis on Relationship between Tunnel Depth and Supporting Time of Secondary Liner

目前针对衬砌构筑时机始终是隧道界讨论的热点问题,提出合理的支护时机对于围岩稳定是相当重要的。然而,其中大部分的有关二次衬砌的合理支护时机的研究都将围岩埋深因素忽略,研究针对茶林顶隧道,通过数值计算给出了不同性质围岩中二次衬砌的合理支护时机,深入研究了埋深对于二次衬砌合理支护时机的影响,从而提出了考虑埋深的修正后的二次衬砌合理支护时机的确定方法。本文得出的研究成果在实际工程的应用中取得了良好的应用效果,提出的支护时机确定方法,可资类似的隧道工程借鉴。

The supporting time of liner is always be the important part of the tunnel problems.The key point to keep rock stable is to give an accurate supporting time of secondary liner,but most of the theory about supporting time has neglected the depth factor.In this article,we discuss the relation between the tunnel depth and the supporting time and give a method to confirm the supporting time of secondary liner based on chalinding tunnel work.The method was proved to be favorable by real project,and it can be used for reference for the similar engineering problem.