Mechanism and Integrated Control of “Rib Spalling: Roof Collapse—Support Instability” Hazard Chains in Steeply Dipping Soft Coal Seams

Liu, Shuai; Yang, Ke; Tang, Chun’an

doi:10.1155/2021/5524591

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…intelligent mining for coal wall control [31]. By creating a mechanical model of the coal wall and applying the deflection theory from materials mechanics, the maximum point of the coal wall's deflection is determined in accordance with the unique circumstances of the 112-2up108 working face of the Jinjitan Coal Mine.…”

Section: Engineering Backgroundmentioning

confidence: 99%

“…Fang et al [28,29] considered the shear failure surface of the coal wall as a circular arc sliding surface, and analyzed the conditions of coal wall compression shear failure and put forward three principles of stability control for coal walls. Liu et al [30] investigated the precise control technology of the entire process of intelligent mining for coal walls with a large mining height and successfully resolved the issue of intelligent mining for coal wall control [31]. By creating a mechanical model of the coal wall and applying the deflection theory from materials mechanics, the maximum point of the coal wall's deflection is determined in accordance with the unique circumstances of the 112-2up108 working face of the Jinjitan Coal Mine.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Engineering Backgroundmentioning

confidence: 99%

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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“…Wang et al (2005), Yang et al (2010), Cheng and Li (2009), Liu et al (2017), Men et al (2014), Du et al (2020a), andDu et al (2022) also made efforts to the overlying strata movement and structural characteristics of the large-dip coal seam mining. Xiong et al (2022), Liu et al (2021), andLi et al (2020) studied mining pressure caused by coal rib spalling.…”

Section: Introductionmentioning

confidence: 99%

Overlying rock movement and mining pressure in a fully mechanized caving face with a large dip angle

et al. 2022

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The overlying rock movement and mining pressure in the fully mechanized caving face with a large dip angle were systematically investigated according to theoretical analysis, similar material simulation, numerical calculation, and field monitoring. The following conclusions were obtained: 1) the theoretical analysis showed that the roof movement characteristics at different positions of the working face are quite different. The mining pressure in the upper section of the working face is primarily controlled by the structural instability of the main roof. The stable structure of the main roof is easily formed in the middle and lower sections of the working face, and the mining pressure is mostly controlled by the collapse of the immediate roof. 2) The results of similar material simulations indicated that the height of the fracture zone in different areas of the working face is different due to the influence of a large dip angle. The height of the fracture zone formed in the upper section of the working face is significantly larger than that formed in the lower section of the working face. 3) The numerical calculation suggested that the residual coal pillar of the overlying coal seam has a certain influence on the mining pressure of the 9-301 working face, making the advanced abutment pressure in the range of 80 m close to the main gate under the coal pillar more obvious. 4) The field pressure monitoring results demonstrated that the influence range of the advanced abutment pressure close to the upper part of the working face is greater than that close to the lower part of the working face, and the peak point is closer to the mining rib. Affected by the overlying residual coal pillar, the hydraulic support resistance and the peak value of advanced abutment pressure in the lower part of the working face are greater than those in the upper part. Both the initial and periodic pressure intervals of the upper section of the working face are smaller than those of the lower section. The results of this research will provide a scientific basis for the reasonable determination of the control measures for the mining pressure.

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“…In China, the conditions for coal seam occurrence are complex, and with the widespread use of fully mechanized working face with great mining height (FGH), coal wall rib-spalling influence on the coal wall stability of FGH has become a key technical problem influencing safe and efficient mining of FGH [1][2][3][4][5][6][7][8][9][10][11]. Coal wall stability is influenced by the main roof movement of the working face, coal body strength, and support, among which the internal joints fissures of the coal body have a crucial influence on the coal body strength.…”

Section: Introductionmentioning

confidence: 99%

The Instability Characteristics and Displacement Law of Coal Wall Containing Joint Fissures in the Fully Mechanized Working Face with Great Mining Height

Guo

Wang

2022

Energies

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Coal wall rib-spalling is regarded as a key technical problem influencing safe and efficient mining of fully mechanized working face with great mining height (FGH) while the coal wall stability is influenced by the strength of the coal body, of which the internal joint fissures have a crucial impact on the strength of the coal body. This research attempted to explore how the coal wall stability of FGH is influenced by the occurrence of joint fissures. This paper uses physical and numerical simulations to systematically analyze the instability characteristics and displacement law of FGH. Research results show that the form and scope of the instability of coal wall rib-spalling depend on the state of the coal seam joint fissures development area, and the development state of coal seam joint fissures is related to the combination of the coal seam joints; under the condition of hard coal, the coal wall stability is better at the inclination angle of 90°, and less stable at 45° and 135°; under the condition of medium-hard coal and joint surface inclination angle of 45° and 135°, the smaller the spacing of joint surface, the larger the area of the working face rib-spalling, and the less stable the coal wall.

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Mechanism and Integrated Control of “Rib Spalling: Roof Collapse—Support Instability” Hazard Chains in Steeply Dipping Soft Coal Seams

Cited by 6 publications

References 17 publications

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

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

Overlying rock movement and mining pressure in a fully mechanized caving face with a large dip angle

The Instability Characteristics and Displacement Law of Coal Wall Containing Joint Fissures in the Fully Mechanized Working Face with Great Mining Height

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