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Abstract The experimental method widely used to judge the stability of tunnel is unable to consider the rock deformation properties，size and overburden；the Chinese Code only supply a wide range of the critical deformation，which is very difficulty to be used in the tunneling practice. A new method based on the elastoplastic solution is proposed to judge the stability of tunnel with consideration of rock deformation properties，strength property，tunnel size and tunnel overburden. Applications of this new method to some tunnel projects show very good correlations with measurements.
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Received: 18 April 2005
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