Title: Influence mechanism of mining speed on energy release in a mine roof and elastic coal system

Authors: Longfei Feng; Quan Zhang; Guangjian Liu

Addresses: China Coal Research Institute, Beijing 100013, China; Xi'an Research Institute of China Coal Technology and Engineering Group Corp, Xi'an, Shanxi, 710054, China ' School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu, 221116, China ' Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing University, Shaoxing, Zhejiang, 312099, China

Abstract: Deep, high-stress, high-strength mining conditions will make the energy release from the mining fields more intensive. The influence mechanism of mining speed on energy release in the mining area was studied using elastic mechanics theory, numerical simulation, and on-site measurement methods. When the average mining speed increases from 3.68 m/d to 5.6 m/d, the cyclic weighting step distance increases from 29.5 m to 38.85 m, indicating that the faster the mining speed, the larger the periodic fracture size of the inferior key strata, and the more energy the bending and sinking static load and dynamic load input into the coal body, the easier to induce rock burst. Based on the curve of mining speed and high-energy mining earthquakes frequency, the critical safe mining speed of Hujiahe Coal Mine is determined to be 4.8 m/d. These conclusions can provide a basis for the mining intensity optimisation in rockburst mines. [Received: May 17, 2023; Accepted: February 27, 2024]

Keywords: mining speed; static load potential energy; bending elastic energy; rock burst; mining intensity optimisation.

DOI: 10.1504/IJOGCT.2024.140286

International Journal of Oil, Gas and Coal Technology, 2024 Vol.36 No.2, pp.197 - 218

Received: 16 May 2023
Accepted: 27 Feb 2024
Published online: 01 Aug 2024 *

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