Numerical Simulation of Effective Extraction Radius of Pre-Drainage Borehole Based on Coal Damage Model

Dangyu Zhang, Minbo Zhang (), Shilong Zhang (), Zichao Wang, Yan Jin and Rentao Liu
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Dangyu Zhang: Jizhong Energy Group Co., Ltd., Xingtai 054000, China
Minbo Zhang: Jizhong Energy Group Co., Ltd., Xingtai 054000, China
Shilong Zhang: School of Resource and Security Engineering, Wuhan Institute of Technology, Wuhan 430074, China
Zichao Wang: School of Resource and Security Engineering, Wuhan Institute of Technology, Wuhan 430074, China
Yan Jin: School of Resource and Security Engineering, Wuhan Institute of Technology, Wuhan 430074, China
Rentao Liu: School of Resource and Security Engineering, Wuhan Institute of Technology, Wuhan 430074, China

Sustainability, 2023, vol. 15, issue 5, 1-14

Abstract: Borehole pre-drainage is an important technical means to control a coal mine gas disaster. In order to determine the optimal pre-drainage parameters of Dashucun mine, a coal damage permeability evolution model was established based on coal damage deformation, considering gas adsorption and desorption and the Klinkenberg effect, and a damage fluid-structure coupling model of coal seam containing gas was established by combining the coal seam deformation equation and the mass conservation equation. COMSOL software was used to simulate the influence of factors such as the initial permeability of coal seam, negative pumping pressure, aperture and pumping time on the effective pumping radius of pre-drainage borehole. The results show that the effect of negative pressure on the effective extraction radius can be ignored. The effect of borehole aperture, initial permeability of coal seam and extraction time on effective extraction radius is great, which conforms to the power function relationship, and the coefficient correlation value is high. The optimal extraction parameters of Dashucun mine are determined as borehole diameter 113 mm, coal seam permeability 1 × 10 −17 m 2 , negative extraction pressure 30 kPa and extraction time 180 d. The research results can provide theoretical reference for the pre-drainage of gas in Dashucun mine.

Keywords: coal mine safety; gas extraction; effective extraction radius; COMSOL (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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