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Abstract The stress distribution of surrounding rocks is of great influence on stability of tunnels. Based on anisotropic damage theory，an axisymmetric FEM program was developed to study stress distribution of a thick cylinder under outside compression. Gradient of tangential stress increases along with the increase of brittle index of rocks，and the maximal tangential stress occures at some distance from the inner surface of the cylinder. The mechanism of the phenomenon is explained that the slices are exfoliated from surrounding rocks with different thickness
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Received: 25 March 2002
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