A coal rib monitoring study in a room-and-pillar retreat mine

Rashed, Gamal; Mohamed, Khaled; Kimutis, Robert

doi:10.1016/j.ijmst.2020.10.001

Cited by 12 publications

(2 citation statements)

References 1 publication

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“…According to the test schemes (Table 2), the simulation was conducted. The horizontal displacement of the coal wall and the volume of the plastic zone in the coal wall in unit length of the dip direction were taken as the indices for evaluating the rib spalling of the coal wall [27,28]. The specific schemes and results of the orthogonal tests are summarized in Table 2.…”

Section: Model Establishmentmentioning

confidence: 99%

Analysis of Influencing Factors and Prevention of Coal Wall Deformation and Failure of Coal Wall in Caving Face with Large Mining Height: Case Study

Meng

Zhang

Wang³

et al. 2023

Applied Sciences

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The coal walls in a caving face with a tall mining height are prone to rib spalling, which leads to the phased cessation of the mining of the working face, causes heavy losses, and endangers the safety of underground workers. In order to prevent serious rib spalling accidents of coal walls in fully mechanized caving faces with a large mining height and to improve the prediction of and ability to control rib spalling, a load-bearing mechanical model of the roof–coal wall–support system was established based on the moment-balance relationship. The expressions for the deformation and stress distribution in a coal wall were calculated. Then, the influences of key factors on the horizontal displacement of the coal wall were investigated. A numerical simulation model of the working face was established, and an orthogonal test design was introduced. On this basis, the influences of four factors: cutting height, breaking position of the main roof, support strength, and sidewall protecting force of the support on the horizontal displacement and volume of a plastic zone of coal wall, were analyzed. Moreover, their order of importance was ranked on the basis of sensitivity. Based on the engineering conditions and production practices in the Cuncaota II Coal Mine, key parameters for controlling and measures for preventing the rib spalling of the coal wall are proposed to guide practical actions.

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Section: Model Establishmentmentioning

confidence: 99%

Analysis of Influencing Factors and Prevention of Coal Wall Deformation and Failure of Coal Wall in Caving Face with Large Mining Height: Case Study

Meng

Zhang

Wang³

et al. 2023

Applied Sciences

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show abstract

“…Rakesh et al [20] determined that the thickness of the coal seam, rock mass properties, and surrounding rock stress conditions must be related to the mining of thick coal seams. Rakesh et al [21] obtained the influence of coal pillar geological conditions and overlying rock depth on coal pillar performance [22]. Aydan et al [23] investigated the mechanism behind the extrusion phenomenon of tunnel-encircling rocks and its associated factors.…”

Section: Introductionmentioning

confidence: 99%

Research on the Mechanism and Control Technology of Coal Wall Sloughing in the Ultra-Large Mining Height Working Face

Zhang

Shen

et al. 2023

IJERPH

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One of the primary factors affecting safe and effective mining in fully mechanized mining faces with large mining heights is coal wall sloughing. This paper establishes the mechanical model of the coal wall and uses the deflection theory for the mechanics of materials to find the maximum point of the deflection of the coal wall, which is the most easily deformed and damaged during the mining process, based on the mining production conditions of the 12-2up108 working face in the Jinjitan Coal Mine. In order to simulate the characteristics of the coal wall in the large mining height working face at various mining heights, the FLAC-3D numerical method was used. The stability of the mining area was assessed in conjunction with the multi-factor fuzzy comprehensive evaluation mathematical model, and the corresponding control of the coal wall was suggested. The study demonstrates that: (1) The working surface at Jinjitan Coal Mine 112-2up108 is a typical drum-out sloughing. The coal wall is most likely to sustain damage at the point where it contacts the roof when the frictional resistance between the coal seam and the roof and floor is less than the uniform load, and at 0.578 times the mining height when the frictional resistance between the coal seam and the roof and floor is greater than the uniform load. (2) In the working face with a large mining height, mining height of the coal wall is one of the significant influencing factors. With increasing mining height, the coal wall’s height also rises nonlinearly, as does the depth of the coal wall in the working face with the large mining height. The growth is linear. The coal wall’s maximum deflection value point moves up and the slab’s height significantly increases when the mining height exceeds 7.5 m. (3) The Jinjitan Coal Mine should be supported by a pressurized and enhanced composite support bracket with a support force greater than 0.245 MPa and a support plate of 3500 mm because it belongs to a Class I stable coal wall, according to a thorough evaluation of a multi-factor fuzzy mathematical model. The working face’s mining pressure is continuously and dynamically monitored, and the stress is released in a timely manner to prevent the occurrence of dynamic disasters.

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Exploring the Deformation Mechanics of Coal Ribs Using the Distinct Element Modeling Approach

Sunkpal

Sherizadeh

2021

Rock Mech Rock Eng

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A coal rib monitoring study in a room-and-pillar retreat mine

Cited by 12 publications

References 1 publication

Analysis of Influencing Factors and Prevention of Coal Wall Deformation and Failure of Coal Wall in Caving Face with Large Mining Height: Case Study

Analysis of Influencing Factors and Prevention of Coal Wall Deformation and Failure of Coal Wall in Caving Face with Large Mining Height: Case Study

Research on the Mechanism and Control Technology of Coal Wall Sloughing in the Ultra-Large Mining Height Working Face

Exploring the Deformation Mechanics of Coal Ribs Using the Distinct Element Modeling Approach

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