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Abstract
The paper aims at investigating the shear creep property and creep model of marble with structural plane. Marble specimens were taken from diversion tunnel engineering of Jinping II hydropower station. A series of shear creep tests were conducted for two types of marbles with weak structural plane and hard structural plane. The results showed that the creep process of marble with weak structural plane included three creep phases when shear stress was higher. However, shear creep process of marble with hard structural plane only included transition creep phase and steady creep phase and roughness of hard structural plane affected on the shear creep property. Based on the experimental results, a time-dependent statistical damage constitutive model was proposed in terms of fractional calculus theory and damage evolution law to describe the time-dependent damage characteristics. The proposed model was analysed by utilising results of marble creep testing. The results of the analysis showed that the proposed model could describe not only the transient and steady creep phase of marble with weak or hard structural plane, but also the acceleration creep phase of marble with weak structural plane when shear stress is higher.