大瑶山隧道F_9断层地质特征及合体稳定特性

GEOLOGICAL CHARACTERISTICS AND ROCKMASS STABILL TY BEHAVIOURS OF THE F_9 FAULT OF DAYAOSHAN TUNNEL

处在隧道中部、埋深达７００ｍ的Ｆ９断层为区域性主干断裂，异常复杂，是隧道修建的难点和关键。本文在充分调查、研究基础上，总结了Ｆ９断层的构造特征、岩体结构特征，岩体性态特征以及变形特征。为隧道设计、施工提供了依据，并针对Ｆ９断层围岩不同的稳定条件，制定了不同的支护系统、采取有效的施工措施。

Located at the coddle and with an embedment up to 700m, the F9 fault is a regional trunk fracture. Being extremely complicated, it is the difficult point and the key to build the tunnel. Based on the sufficient investigation and research, the paper concludes the tectonic characteristics, the structural characteristics, the behaviour characteristics and the deformation characteristics of the rockmass for Fg fault. Therefore, the basis is provided for the tunnel design and construction. In view of different stability conditions of the Fg fault's surrounding rock, different supporting systems are established and effective construction measures are taken.