Shear relaxation characteristics of rock joints under stepwise loadings |
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| Authors: | Ang Liu Guanghui Tian Qingzhao Zhang Wenli Lin Jingcai Jiang |
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| Institution: | 1. Department of Geological Engineering, Nanjing Tech University, Nanjing 211800, China;2. Department of Civil Engineering, Zhongyuan University of Technology, Zhengzhou 450007, China;3. Department of Geotechnical Engineering, Tongji University, Shanghai, 200092, China;4. Department of Geotechnical Engineering, The University of Tokyo, Tokyo 113-8654, Japan;5. Department of Civil and Environmental Engineering, Tokushima University, Tokushima 770-0814, Japan |
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| Abstract: | The stress relaxation characteristic of rock mass is an important aspect of rheology and has important practical significance for rock engineering. In order to investigate the relaxation characteristic of rock joints with different slope ratios and normal stresses, a series of shear stress relaxation tests were conducted on artifical rock joints poured by cement mortar. Test results show that the relaxation curves can be divided into three stages, i.e. instantaneous relaxation stage, attenuation relaxation stage, and stable relaxation stage. Furthermore, the nonlinear Maxwell relaxation equation was obtained by using the relation between the viscosity coefficient and time, and the theoretical curves based on the empirical equation agreed well with the test results. Moreover, the change law of the initial viscosity coefficient was investigated. Accordingly, a stress relaxation method, termed as relaxation stress peak method, was proposed to determine the long-term strength of rock joints. |
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| Keywords: | Rock mass discontinuity Shear stress Stress relaxation Nonlinear Maxwell relaxation equation Long-term strength |
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