Time-Dependent Behavior of Diabase and a Nonlinear Creep Model |
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Authors: | Wendong Yang Qiangyong Zhang Shucai Li Shugang Wang |
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Affiliation: | 1. College of Pipeline and Civil Engineering, China University of Petroleum, D Building, Qingdao, 266580, Shandong, People’s Republic of China 2. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan, 250061, Shandong, People’s Republic of China 3. Department of Energy and Mineral Engineering, EMS Energy Institute and G3 Center, Pennsylvania State University, University Park, PA, 16802, USA
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Abstract: | Triaxial creep tests were performed on diabase specimens from the dam foundation of the Dagangshan hydropower station, and the typical characteristics of creep curves were analyzed. Based on the test results under different stress levels, a new nonlinear visco-elasto-plastic creep model with creep threshold and long-term strength was proposed by connecting an instantaneous elastic Hooke body, a visco-elasto-plastic Schiffman body, and a nonlinear visco-plastic body in series mode. By introducing the nonlinear visco-plastic component, this creep model can describe the typical creep behavior, which includes the primary creep stage, the secondary creep stage, and the tertiary creep stage. Three-dimensional creep equations under constant stress conditions were deduced. The yield approach index (YAI) was used as the criterion for the piecewise creep function to resolve the difficulty in determining the creep threshold value and the long-term strength. The expression of the visco-plastic component was derived in detail and the three-dimensional central difference form was given. An example was used to verify the credibility of the model. The creep parameters were identified, and the calculated curves were in good agreement with the experimental curves, indicating that the model is capable of replicating the physical processes. |
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