A dynamic damage constitutive model for a rock mass with non-persistent joints under uniaxial compression |
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| Affiliation: | 1. College of Engineering & Technology, China University of Geosciences (Beijing), Beijing 100083, PR China;2. School of Civil, Environmental and Mining Engineering, University of Western Australia, Australia;3. Research Institute of Highway, Ministry of Transport, Beijing 100088, PR China;1. School of Earth Sciences and Geological Engineering, Sun Yat-Sen University, Guangzhou 510275, China;2. School of Engineering, Sun Yat-Sen University, Guangzhou 510275, China;3. Guangdong Provincial Key Laboratory of Geological Processes and Mineral Resource Survey, Guangzhou 510275, China;1. Department of Opto-Mechatronics, Wakayama University, Wakayama 640-8510, Japan;2. Department of Mechanical Engineering, National Institute of Technology, Anan College, Tokushima 774-0071, Japan;1. School of Mines, China University of Mining and Technology, Xuzhou 221008, China;2. State Key Laboratory of Deep Coal Resource Mining, China University of Mining and Technology, Xuzhou 221008, China;3. School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;3. School of Nuclear Resources Engineering, University of South China, Hengyang 421001, China;4. Power China Zhongnan Engineering Corporation Limited, Changsha 410014, Hunan, China;5. School of Highway, Chang''an University, Xi''an 710064, China |
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| Abstract: | Most problems faced by the practicing rock mass engineering involve the evaluation of rock mass dynamic strength and deformability. As part of a rock mass, the mesoscopic flaws such as the microcracks and the macroscopic ones such as the joints both inherently affect the rock mass dynamic strength and deformational behavior. Nearly none of the existing models can handle the co-effect of these two kinds of flaws on the rock mass dynamic mechanical behavior. This study focusses on the rock mass with multi-sets of non-persistent joints and establishes a mathematical model accounting for the anisotropy in dynamic strength and deformability induced by the joints. Accordingly, an approach incorporating the existing models or methods to enable perfect simulation of the dynamic stress-strain relationship of a rock mass is proposed, in which the joint geometrical parameters such as the joint length and dip angle, the strength ones such as the joint internal friction and the deformational ones such as the joint normal and shear stiffness can all be taken into account. In order to investigate the validity of the proposed model, a series of calculation examples have been made and the results fits very well with the theoretical ones. |
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| Keywords: | Rock mass with non-persistent joints Dynamic damage constitutive model Macroscopic and mesoscopic flaws Damage coupling Equivalent elastic matrix |
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