| This dissertation combining with practical project, studies the critical technology of the DAXIANGLING deep buried and extra-long tunnel of Bei Jing-Kun Ming highway. The rock-burst prediction and prevention and fast construction engineering problem along tunnel, which is the key and bottleneck project of Ya'an to Lu Gu, were researched according to the field sketch, experiment both in laboratory, simulative calculation and theoretical analysis.As we all know, under the conditions of highland stress, the rock burst is easy to take place in tunnels, there is not a set of mature theory in use of prediction it because of complicated problems existing in the of rock burst in sub engineering and many of factors that influence the happening of rock burst, On the basis of site investigation and monitoring, we can find the test of secondary stress after excavated on the tunnel wall is an effective method on rock burst prediction, On the basis of investigate prevention of rock burst in our country tunnels, and put forward the prevention measures of rock burst that suit for Nibashan tunnel,the performance of the article results in establishment of relative geological mechanics model in accordance with geological conditions and physical mechanics functional data in the area of this engineering, analysis the stress on the tunnel wall and plastic zone under different angles of the joint, we can draw a conclusion that the rock on the tunnel wall is not yield when the rock burst occured in the tunnel,that is the rock is in the plastic conditions when the rock burst occurred. We can build three dimensional stereo-model by software of FLAC 3D in analysis the reason that benching tunneling construction method can prevent the rock burst, through investigating tunnel construction at present, and put forward the'distance'in the design and construction of tunnels in China currently, and basis this we propose the fast construction method of the tunnel, and this construction method possesses high practical value. |
