Numerical analysis of the effects of rock bolts on stress redistribution around a roadway |
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| Affiliation: | 1. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;2. Chinese Academy of Safety Science and Technology, Beijing 110013, China;3. Henan Province Coal Science Research Institute Co., Ltd., Beijing 100013, China;1. School of Resources and Safety Engineering, Central South University, Changsha 410083, China;2. State Key Laboratory of Coal Resources and Safety Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, China;1. School of Civil Engineering, Wuhan University, Wuhan 430072, China;2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China;1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China;2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China;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 |
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| Abstract: | Besides opening geometry, in situ stress and material properties, opening support also has significant effects on stress redistribution around a roadway. To investigate these effects of rock bolts on the stress redistribution around a roadway, a series of numerical studies were carried out using the finite difference method. Since the stress changes around a roadway caused by rock bolting is small relative to the in situ stress, they cannot obviously be observed in stress contour plots. To overcome this difficulty, a new result processing methodology was developed using the contouring program Surfer. With this methodology, the effects of rock bolts on stress redistribution can obviously be analyzed. Numerical results show that in the three patterns of rock bolts installed in the roof, in the roof and the two lateral sides, and in all the four sides of the rectangular roadway, the maximum stress magnitude of the increase is 0.931 MPa, 2.46 MPa,and 6.5 MPa, respectively; the bolt number of 5 can form an integrated ground arch; the appropriate length and pre-tensioned force of the rock bolt is 2.0 m and 60 k N, respectively. What is more, the ground arch action under the function of rock bolting is able to be effectively examined. The rock bolts dramatically increase the minor principal stress around a roadway which results in significant increase in material strength. Consequently, the major principal stress that the material can carry will greatly increase.With adequate supports, an integrated ground arch which is critical for the stability of roadway will be formed around the roadway. |
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| Keywords: | Rock bolts Stress redistribution Numerical simulation Result process |
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