Analysis of Roadheader for Breaking Rock Containing Holes under Confining Pressures

Zenghui Liu, Changlong Du, Hongxiang Jiang and Kai Liu
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Zenghui Liu: School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
Changlong Du: School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
Hongxiang Jiang: School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, China
Kai Liu: Department of Civil Engineering, Monash University, Melbourne, VIC 3800, Australia

Energies, 2017, vol. 10, issue 8, 1-19

Abstract: Deep underground mines have high energy consumption due to the need to overcome the confining pressure. This study investigates the characteristics of the roadheader used for breaking rock containing a different number and size of holes under different confining pressures. A series of simulations were conducted using the LS-DYNA software to study the cutting torque, thrust force, specific energy, and failure mode during the rock-breaking process. Following this, the results were further validated with experimental data. It was found that the decrease in energy rates of rock containing different numbers (1, 5, 9, and 13) of holes are 12.7%, 19.3%, 25.9%, and 38.4%, respectively. Meanwhile, the decrease in energy rates of rock with different hole diameters (35, 45, 55, and 65 mm) are 10.5%, 19.3%, 24.6%, and 28.1%, respectively. Under the confining pressure of 10 MPa, the increase in the torque of the rock without holes is 23.5%, while this increase in the rock with five holes is 7.9%. This indicates that the high torque and energy consumption caused by the confining pressure can be reduced by drilling holes in the rock.

Keywords: specific energy; rock containing holes; confining pressure; rock breaking; LS-DYNA (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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