特长山岭隧道衬砌监测及模拟研究

STUDY ON MONITORING AND SIMULATION OF SUPER-LONG MOUNTAIN TUNNEL LINING

在新奥法的隧道设计理念中,现场的监控量测工作是必不可少的重要组成部分。监控量测不仅能准确反映围岩的稳定性,而且通过对监测数据的分析及在此基础上的数值模拟工作,可以较好地优化隧道的衬砌结构,从而使动态设计、信息化施工成为可能。为实时掌握隧道施工期间的围岩变形和支护结构的受力特点,某特长山岭隧道进行以应力监测和位移监测为基础的全程监控量测工作。并以应力监测为基础,采用有限元软件对隧道衬砌结构在不同级别围岩中的受力状态进行模拟,以监测位移值做标准,对数值模拟结果的正确性进行验证。计算出不同衬砌结构在相应级别围岩中的临界荷载,以指导现场监控量测工作。从而保证隧道的施工安全并优化衬砌设计,为后续工程的设计提供指导。

In the design notion of new Austrian tunnelling method,the processes of monitoring and measurement are important and indispensable in the tunnel construction. The work and the analysis based on it not only correctly reflect the stability of surrounding rock,but also optimize the tunnel lining structure as well. Therefore the dynamic design and informational construction of tunnel can be realized. In order to master the real-time deformation of surrounding rock and the stress characteristics of tunnel lining,the stress and displacement monitoring have been carried out in a super-long tunnel through the construction period. Based on the stress monitoring,the stress of the tunnel lining structure in different rock classifications has been simulated using finite element software. The validity of the simulation has been performed through the displacement monitoring and then the critical loads have been acquired. The results can be used in guaranteeing the safety of projects,optimizing the parameters,guiding the tunnel monitoring in the future design.