Control of floor heaves with steel pile in gob-side entry retaining |
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| Affiliation: | 1. School of Mines, China University of Mining & Technology, Xuzhou 221008, China;2. State Key Laboratory of Coal Resources and Mine Safety, China University of Mining & Technology, Xuzhou 221008, China;1. State Key laboratory of Deep Geomechanics and Underground Engineering, China University of Mining & Technology, Xuzhou 221008, China;2. School of Resource and Earth Science, China University of Mining & Technology, Xuzhou 221008, China;1. State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China;2. School of Mechanics & Civil Engineering, China University of Mining & Technology, Xuzhou 221116, China;1. Department of Mechanical Engineering, The University of Tokyo, Tokyo 113-8656, Japan;2. Komatsu Ltd., 2-3-6, Akasaka, Minato-ku, Tokyo 107-8414, Japan;1. School of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China;2. State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221008, China;1. Civil Engineering Department, Ohio University, Athens, OH 45701, USA;2. Jim lives in Powell, Ohio 43065, USA |
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| Abstract: | A new approach named as steel pile method is innovatively proposed in this study to control severe floor heaves in gob-side entry retaining. It is required that the steel piles be installed in the floor corners with a certain interval before the influence of the dynamic pressure induced by current panel extraction. Using numerical simulation and theoretical analysis, this study investigated the interaction between the steel piles and the floor rocks during the service life of the steel piles, and revealed the mechanism of the steel piles in controlling floor heaves. The effect of the steel pile parameters on the control of floor heaves was presented and elaborated. It is found that the effectiveness of the steel piles in controlling floor heaves can be enhanced with greater installed dip angle, longer length and smaller interval of the steel piles.Compared with traditional methods, e.g., using floor anchor bolts and floor restoration, the advantages using steel pile were successfully defined in terms of controlling effect and economic benefits. It is hoped that the proposed method can contribute to the development of gob-side entry retaining technique. |
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| Keywords: | Gob-side entry retaining Floor heave Steel pile Stress arch Control mechanism |
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