Elasto-plastic analysis of the surrounding rock mass in circular tunnel based on the generalized nonlinear unified strength theory |
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| Affiliation: | 1. College of Water Conservancy and Hydropower, Hohai University, Nanjing 210098, China;2. College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China;1. School of Mechanics and Architecture Engineering, China University of Mining & Technology, Beijing 100083, China;2. State Key Laboratory for Geomechnics & Deep Underground Engineering, Beijing 100083, China;1. Key Laboratory of Deep Coal Resource Mining, Ministry of Education of China, China University of Mining & Technology, Xuzhou 221116, China;2. School of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China;1. School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou 221116, China;2. Ministry of Education’s Key Lab of Coal Processing and High Efficient Clean Utilization, Xuzhou 221116, China;3. Advanced Analysis and Computation Center, China University of Mining & Technology, Xuzhou 221116, China;4. School of Resources and Geosciences, China University of Mining & Technology, Xuzhou 221116, China |
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| Abstract: | The present paper aims to establish a versatile strength theory suitable for elasto-plastic analysis of underground tunnel surrounding rock. In order to analyze the effects of intermediate principal stress and the rock properties on its deformation and failure of rock mass, the generalized nonlinear unified strength theory and elasto-plastic mechanics are used to deduce analytic solution of the radius and stress of tunnel plastic zone and the periphery displacement of tunnel under uniform ground stress field. The results show that: intermediate principal stress coefficient b has significant effect on the plastic range, the magnitude of stress and surrounding rock pressure. Then, the results are compared with the unified strength criterion solution and Mohr–Coulomb criterion solution, and concluded that the generalized nonlinear unified strength criterion is more applicable to elasto-plastic analysis of underground tunnel surrounding rock. |
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| Keywords: | Circular tunnel Generalized Hoek–Brown strength criterion Generalized nonlinear unified strength criterion Intermediate principal stress Elasto-plastic stress and displacement |
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