Analysis of fracture propagation in a rock mass surrounding a tunnel under high internal pressure by the element-free Galerkin method |
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| Affiliation: | 1. Civil Engineering Department, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Thung Khru District, Bangkok, Thailand;2. Bureau of Planning, Department of Rural Roads, Ministry of Transport, Thailand;3. School of Civil Engineering and Technology, Sirindhorn International Institute of Technology, Thammasat University, Thailand;1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei, China;2. Exploration and Development Research Institute, SINOPEC Jiangsu Oilfield Company, Yangzhou, 225009, Jiangsu, China;3. SINOPEC Gas Storage Branch Company, Zhengzhou, 450007, Henan, China;4. Mackay School of Earth Sciences and Engineering, University of Nevada, Reno, 89557, Nevada, USA;1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092, PR China;2. College of Civil Engineering, Shaoxing University, Shaoxing 312000, PR China;3. China Datang Corporation Renewable Power Co. Ltd., Beijing 100053, PR China;1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. Department of Civil Engineering, Faculty of Engineering, King Mongkut’s University of Technology Thonburi, Bangkok 10140, Thailand |
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| Abstract: | Fractures developed around high pressurized gas or air storage tunnels can progressively extend to the ground surface, eventually leading to an uplift failure. A tool reasonably reproducing the failure patterns is necessary for stability assessment. In this study, a numerical method based on the element-free Galerkin (EFG) method with a cohesive crack model is developed to simulate fracture propagation patterns in the rock mass around a tunnel under high internal pressure. A series of physical model tests was also conducted to validate the reliability of the developed method. A qualitative agreement between physical model tests and numerical results can be obtained. The in situ stress ratio, k, has a strong influence on both the position of crack initiation and the propagation direction. The numerical analyses were extended to full-scale problems. Numerical tests were performed to investigate the prime influencing factors on the failure patterns of a high pressurized gas circular tunnel with varying parameters. The results suggest that initial in situ stress conditions with a high k (larger than 1) is favorable for construction of pressurized gas or air storage tunnels. |
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| Keywords: | Fracture propagation Tunnel in rock High internal pressure EFG |
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