Danger Forecast of Tunnel in Excavation

Based on the basic law of tunnel rock deformation and distant affection law of tunnel excavation, the method to judge tunnel rock stability according to the state of tunnel rock deformation velocity was put forward. If the deformation velocity changers less and less with the time, the deformation develop to stability. If the deformation velocity does not changer with the time, the tunnel rock locates on critical state or rheology state. If the deformation velocity equals to zero, the rock is stability. If the deformation velocity changers larger and larger with the time, the deformation state was sort into norm state and abnormal state. The abnormal state is very danger. Forecast must be put out in advance. H-K rheology modulus was used to simulate tunnel rock. The element finite method was used to simulate the processor of excavating the tunnel. A case study was show the method is right. The stability state and reinforced time was ascertained.