隧道浅埋偏压段洞室施工围岩变形特点及其控制处理

Wall Rock Deformation Characteristics and Controlling of Shallow Covered Slope Section of the Tunnel

隧道施工的难点主要集中在隧道的进出口阶段。一般而言,隧道的进出口往往集"浅埋深、偏压、围岩松散破碎"等多种不利因素于一体,对隧道施工的影响较大,稍有不慎极易诱发工程事故。通过笔者近6年来积累的隧道监控量测资料和实践经验,结合工程实例,描述了隧道在浅埋偏压段施工期间所产生的诸多异常现象,并就其原因进行了详细剖析,据此给出了科学的处理方案,最终确保了隧道的整体安全。为后续同类的隧道施工提供了相应的理论依据与实践基础。

Difficulties of tunnel construction mainly appear in the entrance and exit stage.According to incomplete statistics,more than 50% tunnel deformation and failure phenomena appear in the entrance and exit of the construction phase.The appearances of deformation are slope shear slip,the hole section of tunnel collapse,roof collapse,etc..The occurrence of such destruction often causes greater loss of engineering and even results in heavy casualties.Therefore,it has great significance to adopt strict monitoring measures in the construction of the entrance to ensure safety construction.According to measurement data of tunnel monitoring and practical experience,the paper introduces wall rock deformation characteristics of shallow covered slope section of the tunnel during excavation and the effective control treatment measures in terms of typical examples.