Abstract：The creep tests on marble specimens from the underground powerhouse of Jinping I hydropower station of China are carried out to meet the demand of long-term stability analysis of the caverns during the construction and the operation periods. Two common rheological models，Hooke-Kelvin model and Burgers model，and their parameters determination are described with comparative discussion for the model selection. The least squares fitting to the testing results with the model curve is recommended to gain the model parameters. The creep testing system and the testing procedure are introduced briefly. It is manifested by the uniaxial creep tests and the biaxial creep tests that the considered marble shows time-dependent behavior to some extent under certain stress states. The deformation gradually approaches to corresponding constant after the early stage of creep attenuation，which accords with the creep characteristic of the Hooke-Kelvin model. The measured strains with respect to the loading time are close to the Hooke-Kelvin model curve. Therefore，the Hooke-Kelvin model is recommended to describe the rheological properties of marble. As for the Burgers model，the analysis shows that it is unsuitable for modeling the viscoelasticity of hard rock like marble. The creep behavior during relatively longer testing time，e. g. 150 hours or so，needs to be examined if the Burgers model is adopted. The fact that the deformation of the underground powerhouse caverns of Jinping I hydropower station finally tends to become steady after excavation can be better explained by means of the Hooke-Kelvin rheological model. The Hooke-Kelvin rheological model and the model parameters obtained from creep tests may also be served as the fundamental data in the later long-term stability analysis of the surrounding rocks of the underground powerhouse caverns in the periods of construction and operation.
张明，毕忠伟，杨强，程丽娟，李仲奎. 锦屏一级水电站大理岩蠕变试验与流变模型选择[J]. 岩石力学与工程学报, 2010, 29(08): 1530-1537.
ZHANG Ming，BI Zhongwei，YANG Qiang，CHENG Lijuan，LI Zhongkui. CREEP TEST AND RHEOLOGICAL MODEL SELECTION OF MARBLE OF JINPING I HYDROPOWER STATION. , 2010, 29(08): 1530-1537.
