Title: Mechanical characteristics and damage evaluation of coal subjected to aerodynamic cavitation: an experimental study

Authors: Hu Wen; Bin Cheng; Siqing Sun; Duo Zhang; Bingyi Jia; Mingyang Liu

Addresses: Xi'an University of Science and Technology, No. 58 Yanta Road, Xi'an, 710054, Shaanxi Province, China ' Xi'an University of Science and Technology, No. 58 Yanta Road, Xi'an, 710054, Shaanxi Province, China; CCTEG Xi'an Research Institute, No. 82 Jinye Road, Xi'an, 710077, Shaanxi Province, China ' CCTEG Xi'an Research Institute, No. 82 Jinye Road, Xi'an, 710077, Shaanxi Province, China ' Xi'an University of Science and Technology, No. 58 Yanta Road, Xi'an, 710054, Shaanxi Province, China ' Xi'an University of Science and Technology, No. 58 Yanta Road, Xi'an, 710054, Shaanxi Province, China; CCTEG Xi'an Research Institute, No. 82 Jinye Road, Xi'an, 710077, Shaanxi Province, China ' Xi'an University of Science and Technology, No. 58 Yanta Road, Xi'an, 710054, Shaanxi Province, China

Abstract: Aerodynamic cavitation, employed as a method for preventing coal and gas outbursts, has produced good results in the Huainan mining area in China. In this study, unloading confining pressure triaxial compression experiments were utilised to evaluate the mechanical characteristics of coals subjected to this rapid unloading process. Aerodynamic cavitation was simulated using physical similarity experiments, and the gas injection pressure and pressure duration were utilised as variables to assess the damage in a coal seam caused by a gas injection-blowout event. According to the results, a gas injection-blowout event causes damage that extends to a depth of approximately 45 mm. The study reveals that the damage caused by aerodynamic cavitation depends on the pressure condition of the pores in the coal. This study provides a theoretical basis for increasing the cavitation effect caused by a gas injection-blowout event, simultaneously saving construction costs. [Received: March 29, 2023; Accepted: July 13, 2023]

Keywords: aerodynamic cavitation; physical similarity simulation; triaxial compression; gas outburst elimination; crosscut uncovering.

DOI: 10.1504/IJOGCT.2023.135054

International Journal of Oil, Gas and Coal Technology, 2023 Vol.34 No.4, pp.386 - 412

Received: 28 Mar 2023
Accepted: 13 Jul 2023
Published online: 29 Nov 2023 *

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