Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Zhao, Shankun; Zuo, Jianping; Liu, Lei; Wu, K.B.

doi:10.1155/2021/8837189

Cited by 3 publications

(1 citation statement)

References 18 publications

(18 reference statements)

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“…A stop-mining coal pillar (SMCP) is crucial to maintain the stability of the main roadway surrounding rock (MRSR). Narrower coal pillars cause the roadway to be under the influence of mining stress, which is vulnerable to coal pillar instability and roadway deformation [1][2][3], while wide coal pillars will reduce the recovery rate, resulting in serious loss of coal resources [4]. Therefore, a reasonable width of the SMCP is essential for safe and efficient production in the mine [5,6].…”

Section: Introductionmentioning

confidence: 99%

Study on Characteristics of Front Abutment Pressure and Rational Stop-Mining Coal Pillar Width in Large Height Working Face

Yu,

Fan,

Zhang

et al. 2024

Processes

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The width of a stop-mining coal pillar is of great significance to the stability of the surrounding rock of the main roadway and the safety of production in the mine. This paper focuses on the west panel of Sihe Coal Mine as the engineering background, analyzes the evolution characteristics of front abutment pressure in the mining area under conditions of rapid advancement and large mining height and its sensitivity to influencing factors, explores the coupling mechanism between the width of the stop-mining coal pillar and the surrounding rock of the main roadway, and analyzes the differences in mining pressure characteristics such as internal stress of the coal pillar, vertical stress, deformation, and failure of the main roadway’s surrounding rock under different coal pillar widths with the influence of mining. The comprehensive results indicate that the influence range of front abutment pressure on the working face is 65 m, and the significance ranking of different mining factors acting on it is as follows: mining height > working face length > advancing speed. The rational width of the stop-mining coal pillar is determined to be 80 m while the stress field of the surrounding rock in the main roadway is in a critical state of mining disturbance. Industrial tests have shown that the relative displacements between the roof and floor as well as the ribs of the main roadway are relatively small, at 105 and 260 mm, respectively, which can effectively maintain the stability of the surrounding rock of the main roadway. The research results can provide a scientific basis and engineering reference for the design of stop-mining coal pillars in mines with similar geological conditions.

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Section: Introductionmentioning

confidence: 99%

Study on Characteristics of Front Abutment Pressure and Rational Stop-Mining Coal Pillar Width in Large Height Working Face

Yu,

Fan,

Zhang

et al. 2024

Processes

View full text Add to dashboard Cite

show abstract

Synergistic Inhibiting and Sealing Material for Preventing the Compound Disaster of Gas and Coal Spontaneous Combustion: Ratio Optimization and Inhibition Test

Tang

Zhang

Deng

et al. 2022

Combustion Science and Technology

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Key Bearing Structure Instability Mechanism: A Case Study in Mining Under Close‐Distance Coal Pillar

Ma,

Tu,

et al. 2024

Geofluids

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This study is aimed at solving the issue of mining under the boundary coal pillar of the close‐distance coal seam that causes roof falling. This study established a new key bearing structure model for analyzing the structural instability mechanism when mining under the coal pillar at the working face by taking Shaping Coal Mine as an example. The purpose of this study is to analyze the formation process, load transfer mechanism, and two failure types of the key bearing structure using theoretical analysis and numerical simulation. Additionally, this study discussed the timing and method of roof control for different key bearing structure failure types. Research shows that the instability of the key bearing structure composed of the coal pillar, interlayer rock, and lower coal body is the important reason behind the roof falling. The instability types of key bearing structures include the coal pillar instability type and the cantilever beam instability type. The stability width of the interlayer rock cantilever beam and the coal pillar jointly ascertain the failure type of the key bearing structure. In the 9204 working face, the key bearing structure was destroyed when the coal pillar was 14 m wide, resulting in the roof stress being as high as 31.81 MPa. The stress drop phenomenon can be used as a boundary to divide the failure process of the key bearing structure into three stages. The pressure relief of the coal pillar and interlayer rock cantilever beam is an effective way to deal with this problem, and the coal pillar instability type needs to be pressure relieved earlier than the cantilever beam instability type. The research findings offer new insights into the roof stability control of mining under the coal pillar.

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Study on the Retention of Large Mining Height and Small Coal Pillar under Thick and Hard Roof of Bayangaole Coal

Cited by 3 publications

References 18 publications

Study on Characteristics of Front Abutment Pressure and Rational Stop-Mining Coal Pillar Width in Large Height Working Face

Study on Characteristics of Front Abutment Pressure and Rational Stop-Mining Coal Pillar Width in Large Height Working Face

Synergistic Inhibiting and Sealing Material for Preventing the Compound Disaster of Gas and Coal Spontaneous Combustion: Ratio Optimization and Inhibition Test

Key Bearing Structure Instability Mechanism: A Case Study in Mining Under Close‐Distance Coal Pillar

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