Abstract A series of loading and unloading tests of marble from deep-buried diversion tunnel of Jinping hydropower station are carried out，which reveal that marble specimens have remarkable volumetric dilatancy before failure in both loading and unloading conditions. To describe the law of volumetric deformation of marble in the tests，a new constitutive model is presented based on modifying Weng¢s model[13] of rock mass. Comparison between theoretical and test results indicated that the proposed model can describe the characteristics of marble volumetric deformation well. This model can consider the discrepancy of rock strength under loading and unloading conditions；and it can be used to describe unloading process from uniaxial compression stage；the proposed model is of high applicability.
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Received: 25 February 2010
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