Abstract
Top coal caving has become one of the main mining methods for thick and extrathick coal seams. Because of coal seam conditions, the top coal thickness is not constant. It is necessary to study the influence of top coal thickness changes on the top-coal-caving mining process. To explore the migration law of top coal failure, the experimental means of similar simulation experiment, numerical simulation experiment and field monitoring data were used. Through a similar simulation test of three different top coal thicknesses, the change rule of top coal migration was analyzed. Moreover, the stress and displacement changes of a 14 m coal seam over a thick top coal caving face were monitored and analyzed comprehensively with the simulation results. The results show that when the top coal thickness is unchanged, the top coal vertical displacement in the upper part is larger than that in the middle part due to the top plate rotation in front of the working face, and the stress change follows an opposite trend. The simulation results were the same as the field test results. When the top coal thickness is changed, whether it is upper top coal or middle top coal, the top coal displacement and stress changes will increase. The top coal migration will be more obvious, and thus the crushing will be more serious.
Funder
National Natural Science Foundation of China
Subject
General Earth and Planetary Sciences
Reference59 articles.
1. Field and numerical investigations of gateroad system failure induced by hard roofs in a longwall top coal caving face;Bai;Int. J. Coal Geol.,2017
2. Technology of coal extraction from steep seam in the Ostrava-Karvina basin;Bondarenko;Ugol Ukralny,1993
3. A zoning model for coal mining-induced strata movement based on microseismic monitoring;Cheng;Int. J. Rock Mech. Min. Sci.,2017
4. Experimental study of acoustic emission characteristics of foamed concrete under uniaxial compression;Duan;J. China Univ. Min. Technol.,2018
Cited by
4 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献