Prediction of plastic zone size around circular tunnels in non-hydrostatic stress field |
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| Affiliation: | 1. Geotechnical Department, Faculty of Civil Engineering, Graduate University of Advanced Technology, Kerman 7631133131, Iran;2. Mining Engineering Department, Faculty of Engineering, Shahid Bahonar University of Kerman, Kerman 7618868366, Iran;1. School of Civil Engineering, Chongqing University, Chongqing 400030, China;2. Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing 400030, China;1. Department of Earth Resource and Information, China University of Petroleum, Qingdao 266555, China;2. Western New Prospect Research Center, Shengli Oilfield, Dongying 257000, China;1. North Vancouver, British Columbia, V7R 4H7, Canada;2. Brisbane, Queensland 4169, Australia;1. Key Laboratory of Urban Underground Engineering of Ministry of Education, Beijing Jiaotong University, Beijing, 100044, China;2. Beijing Academy of Safety Science and Technology, Beijing, 101101, China |
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| Abstract: | This paper discusses the calculation of plastic zone properties around circular tunnels to rock-masses that satisfy the Hoek–Brown failure criterion in non-hydrostatic condition, and reviews the calculation of plastic zone and displacement, and the basis of the convergence–confinement method in hydrostatic condition. A two-dimensional numerical simulation model was developed to gain understanding of the plastic zone shape. Plastic zone radius in any angles around the tunnel is analyzed and measured, using different values of overburden (four states) and stress ratio (nine states). Plastic zone radius equations were obtained from fitting curve to data which are dependent on the values of stress ratio, angle and plastic zone radius in hydrostatic condition. Finally validation of this equation indicate that results predict the real plastic zone radius appropriately. |
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| Keywords: | Plastic zone radius Convergence–confinement method Non-hydrostatic condition Stress ratio |
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