Preliminary Analysis on and Application of Stability-controlling Structure Planes of Tunnels in Hard Rock Mass

In order to fulfill rapid and continuous construction of tunnels in hard rock mass,the situations of cave-ins in Houyuntaishan tunnel on harbor highway in Lianyungang is analyzed,the types of cave-ins in tunnels in hard rock mass is discussed and structure plane stability control methods and major causes for the cave-ins are presented.Conclusion is drawn that cave-ins in tunnels in hard rack mass can be predicted and can be minimized by adopting structural plane stability control methods,advance geology forecasting methods and effective rock mass reinforcement.