Coal and rock dynamic disaster prevention and control technology in the large mining face of a deep outburst mine

doi:10.1007/s11707-022-1060-8

Front. Earth Sci.

2023, Vol. 17

Issue (3) : 701-712 https://doi.org/10.1007/s11707-022-1060-8

RESEARCH ARTICLE

Coal and rock dynamic disaster prevention and control technology in the large mining face of a deep outburst mine

Jianguo ZHANG¹, Man WANG¹, Hongwei ZHOU⁴, Dongming ZHANG^2,³(

), Beichen YU^2,³, Chongyang WANG^2,³, Yujie WANG¹

¹. State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization, China Pingmei Shenma Holding Group CO., LTD, Pingdingshan 467000, China
². State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400030, China
³. School of Resources and Safety Engineering, Chongqing University, Chongqing 400030, China
⁴. School of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China

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Abstract

In this study, we systematically studied the occurrence regularity of in situ stress in the Pingdingshan mine. The critical criterion model of coal-rock destabilization was established based on the theoretical framework of fracture mechanics. Furthermore, we analyzed the coupling destabilization mechanism of in situ stress and gas and studied the influence of the variation between original rock stress and mining-induced stress on the critical criterion. Through field experiments and applications, we established a three-dimensional gas drainage technology system for areas with a large mining height and long work face. Based on our research, a demonstration project was developed for deep mine dynamic disaster control. The technical system included the arrangement and optimization of pre-drainage holes along the coal seam, technology, and optimization of gas drainage through the bottom drainage tunnel and upper corner, gas drainage technology through sieve tubes, and a two plugging with one injection under pressure sealing technology. The implementation of the demonstration project effectively reduced the gas content and pressure of the coal seam in the deep mine, and the project increased the critical strength of the instability and failure of coal and rock.

Keywords in-situ stress dynamic disaster critical criterion gas drainage

Corresponding Author(s): Dongming ZHANG

Online First Date: 08 September 2023 Issue Date: 12 December 2023

Cite this article:

Jianguo ZHANG,Man WANG,Hongwei ZHOU, et al. Coal and rock dynamic disaster prevention and control technology in the large mining face of a deep outburst mine[J]. Front. Earth Sci., 2023, 17(3): 701-712.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-022-1060-8
https://academic.hep.com.cn/fesci/EN/Y2023/V17/I3/701

Point	1	2	3	4	5	6	7	8	9	10	11
$σ H / σ h$	2.09	1.93	1.82	1.88	1.90	1.74	1.70	2.04	1.60	1.42	1.88

Tab.1 Ratio of maximum and minimum horizontal principal stresses of some measuring points in Pingdingshan mining area

Fig.1 Critical criterion of in situ stress and stress at different depths.

Fig.2 Stress field analysis of surrounding rock.

Fig.3 Relationship between the stress concentration coefficient and critical stress in the working face.

Fig.4 Relationship between mining pressure relief and critical stress.

Fig.5 Deterioration of failure criterion with the increase in gas pressure.

Fig.6 Deterioration of coal and rock mass strength in different depth by gas pressure.

Fig.7 Schematic diagram of the one side, seven lane three-dimensional gas drainage system layout. (a) Plane diagram. (b) Three-dimensional diagram.

Fig.8 Comprehensive pipeline system of gas three-dimensional drainage.

Fig.9 Relation diagram of drilling time and pre-pumping rate of each group.

Fig.10 Gas concentration in the upper corner of high drainage roadway during drainage.

Fig.11 Layout of gas drainage borehole in the bottom drainage roadway.

Fig.12 Changes in gas concentration over time.

Fig.13 Schematic diagram of pressure tap arrangement. (a) Layout of manometric borehole. (b) Layout plan of manometric borehole section.

Fig.14 Change in gas pressure in the coal seam over time in the pre-drainage area. (a) Change in gas pressure in borehole at 0 m horizontal distance with time. (b) Change in gas pressure with time at 20 m horizontal distance. (c) Change in gas pressure with time at 30 m horizontal distance.

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