Simulation of roof shear failure in coal mine roadways using an innovative UDEC Trigon approach |
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| Institution: | 1. Engineering Geology and Resource Geotechnics Group, Simon Fraser University, Burnaby, BC, Canada;2. State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute), Beijing, China;1. Nanyang Centre for Underground Space, School of Civil and Environmental Engineering, Nanyang Technological University, 639798, Singapore;2. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;3. State Key Laboratory for Geomechanics and Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, China;4. Department of Civil Engineering, Monash University, Clayton, 3800, VIC, Australia;1. Key Laboratory of Deep Coal Resource, Ministry of Education of China, School of Mines, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China;2. Department of Civil Engineering, University of Toronto, 170 College Street, Toronto M5S 3E3, ON, Canada;1. Mining & Designing Branch, China Coal Research Institute, Beijing, China;2. State Key Laboratory of Coal Mining and Clean Utilization (China Coal Research Institute), Beijing, China |
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| Abstract: | Shear failure is a common failure mechanism in underground coal mine roadways. This paper presents an innovative numerical approach to simulate shear failure of a coal mine roadway roof. The distinct element code, UDEC, incorporating a proposed Trigon logic is employed for the study. Using this approach, shear failure in the mine roof characterized by fractured initiation and propagation is successfully captured. The results suggest that shear failure of the roadway roof initiates at the roadway corners and then progressively propagates deeper into the roof, finally forming a large scale roof failure. The numerical results confirmed the time sequence of marked microseismic activity, significant stress changes and accelerated displacement during the process of a roof fall. The effect of rock bolting in the control of roof shear failure in a roadway is evaluated using the UDEC Trigon approach. It is found that the installation of rock bolts constrains rock dilation, reduces failure of rock bridges and maintains rock strength thereby leading to a significant decrease in roof sag. |
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| Keywords: | Roadway Shear failure Tensile cracking Rock bolting Numerical simulation |
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