Abstract：Cangling tunnel in Taizhou¾Jinyun highway，with a depth about 768 m and with a length about 7.6 km，will be the deepest and longest tunnel in Zhejiang Province after construction. Rockburst is a serious problem during the tunnel excavation. For the prediction of rockburst，physico-mechanical properties of the rock masses were tested in the laboratory；and the in-situ stress state in the engineering area was measured and analyzed. Then，the rock masses along the tunnel were classified on the basis of local geological investigation. A mechanical model was developed to express the actual conditions of the engineering area according to properties of the rock masses，focal mechanism solutions，and in-situ stress state. The in-situ stress field of the engineering area was regressed by 3D finite element method (FEM) by using in-situ measured stress. The calculated results were applied to numerical analysis of the stress distribution in rock masses around the tunnel. Finally，the probability and intensity of rockburst along tunnel were predicted according to four different rockburst prediction models developed by predecessors on the basis of calculated stress distribution around the tunnel and uniaxial compressive strength of the rock masses.
