Numerical simulation of induced cutting in deep coal.

Autor:	Liu SF; Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, People's Republic of China.; School of Mines, China University of Mining and Technology, Xuzhou 221116, People's Republic of China., Lu SF; Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, People's Republic of China.; School of Mines, China University of Mining and Technology, Xuzhou 221116, People's Republic of China., Wan ZJ; Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, People's Republic of China.; School of Mines, China University of Mining and Technology, Xuzhou 221116, People's Republic of China., Zhang HW; Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, People's Republic of China.; School of Mines, China University of Mining and Technology, Xuzhou 221116, People's Republic of China., Xing KK; Key Laboratory of Deep Coal Resource Mining (CUMT), Ministry of Education of China, China University of Mining and Technology, Xuzhou 221116, People's Republic of China.; School of Mines, China University of Mining and Technology, Xuzhou 221116, People's Republic of China.
Jazyk:	angličtina
Zdroj:	Royal Society open science [R Soc Open Sci] 2019 Sep 18; Vol. 6 (9), pp. 190308. Date of Electronic Publication: 2019 Sep 18 (Print Publication: 2019).
DOI:	10.1098/rsos.190308
Abstrakt:	Deep coal cutting is a hot research topic at present. In this paper, the cutting technology of three-drum shearer was proposed based on previous studies. Besides, the influence of confining pressure on coal cutting performance was studied by using the discrete element method, and the induction effect of central cutting on coal cutting performance was discussed. Moreover, coal cutting with different boundary conditions was simulated with the aid of PFC 2D software. The results show that as the confining pressure increases, the model dominated by tensile failure does not change, but the crack gradually develops from the vertical direction to the free surface of coal. The cutting debris first increases and then decreases; so does the cutting force. Under the effect of central cutting, the crack tends to develop towards the free surface of coal more, and both the peak cutting force and the specific energy consumption increase with the increase of confining pressure. Induced by central cutting, with the increase of confining pressure, the reduction value of peak cutting force increases first and then decreases while the reduction value of cutting specific energy consumption increases. Competing Interests: We declare we have no competing interests. (© 2019 The Authors.)
Databáze:	MEDLINE
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