| Cangling extreme long-tunnel possesses the characteristics of deep carving (about 770m), extreme length (7.6km) and crossing complicated geological environment and tectonic stress field of highland so as to exist phenomenon of rock-burst.There is neither a set of mature theory in use of prediction it nor systematic and comprehensive understanding its reasons because of complicated problems existing in the of rock-burst in sub engineering and many factors that influence the happening of rock-burst and different theories of grading and predictiom it in different sub engineering. This article focuses on research of prediction of rock-burst happened in Cangling extreme long-tunnel engineering, comparison of tunnel carving details in the performing stage and prevention measures. As a result, the article discussed the application of prediction of rock-burst in Cangling tunnel engineering, discovered the original tectonic stress field and characters of rocks in the tunnel and fractal intensity and basic distribution rules of Cangling tunnel, and mentioned engineering measures in prevention of rock-burst.Besides, the performance of 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. The comparison between the result from inversion analysis by using MSC.Patran and the result of geological tectonic stress offracture measured by experiment of drilling it by water pressure is similar. Recovering analysis of tectonic stress of tunnel wall in the working stage has proved the model. Above evidence discloses the application of theoretic model and MSC.Patran model and the accuracy and reasonableness of tectonic stress field analysis. On the base of above performance, rock-burst prediction and efficient prevention measures that can bring out highly value in application of tunnel project have been used in the construction of Cangling tunnel.
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