Study on the method of pressure relief by roof cutting and absorbing energy in deep coal mines

Xue, Haojie; Wang, Qi; Jiang, Bei; Jiang, Zhenhua; Wang, Yue; Huang, Yubing; He, Manchao

doi:10.1007/s10064-023-03313-1

Cited by 4 publications

(1 citation statement)

References 31 publications

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“…(1) The influence range of the front abutment pressure on the working face should not exceed 1.0-1.2 times that of the width of the working face [17,18].…”

Section: Excavation Timing Of Withdrawal Roadwaymentioning

confidence: 99%

The Active Roof Supporting Technique of a Double-Layer Flexible and Thick Anchorage for Deep Withdrawal Roadway under Strong Mining Disturbance

Han,

Yuan,

Ding

et al. 2023

Applied Sciences

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Due to the strong disturbance of a mining face, the surrounding rock of the withdrawal roadway is susceptible to deformation and failure, which restricts the safe and efficient evacuation of mining equipment. To resolve this longstanding technical problem in mine production, an engineering investigation, numerical simulation, theoretical analysis, and other research methodologies were conducted in this study. Furthermore, the influence mechanism of mining-induced stress on the withdrawal roadway was revealed, the anti-disturbance principles of thick-layer anchorage of roadway roofs were elucidated, and a novel double-layer flexible support technique was proposed. The front abutment pressure, stress superposition, damage accumulation of the surrounding rock, and the fluctuation of mining-induced stress are the primary factors contributing to the significant deformation of the surrounding rock in a withdrawal roadway. However, the fluctuation of mining-induced stress has usually been ignored in previous studies, and it may be the most crucial cause of the significant deformation and instability of the surrounding rock. The thickness of the anchored rock beam is the most vital factor affecting the maximum subsidence and maximum tensile stress of the roof, and increasing the thickness of the anchored rock beam can significantly improve the stability and anti-disturbance performance of the roof. In the proposed double-layer flexible supporting technique, flexible steel strands serve as the carrier, which overcomes the constraint of the roadway height on the length of roof support components. The first layer of flexible support is used to construct a thick fundamental anchorage layer, while the second layer is employed to construct a thicker reinforced anchorage layer, facilitating the effective resistance of the roof against strong mining disturbances. The effectiveness of this technique was further validated through the application of an engineering practice. The research results have reference value for solving the difficult problem of mining roadway support.

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“…(1) The influence range of the front abutment pressure on the working face should not exceed 1.0-1.2 times that of the width of the working face [17,18].…”

Section: Excavation Timing Of Withdrawal Roadwaymentioning

confidence: 99%

The Active Roof Supporting Technique of a Double-Layer Flexible and Thick Anchorage for Deep Withdrawal Roadway under Strong Mining Disturbance

Han,

Yuan,

Ding

et al. 2023

Applied Sciences

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Engineering Application of AFR Mining Method

Wang,

Jiang,

Jiang

2024

Theory and Method of Automatically Formed Roadway in Underground Mining

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Key parameters of gob-side entry retaining by roof cutting in close-distance seam group

Hu,

Yang,

et al. 2024

Geomech. Geophys. Geo-energ. Geo-resour.

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During the process of close-distance seam group mining, the coal pillar in the upper coal seam is a stress-concentrated area, which leads to a loss of stability of the roadway during mining of the lower coal seam. This lack of stability introduces great safety hazards to coal mines. To solve the problem of stress concentration of coal pillars, the method of gob-side entry retaining by roof cutting is proposed to remove the coal pillar. In this study, FLAC3D was used to analyze the depth and angle of pre-split blasting. LS-DYNA was used to analyze the spacing of the blasthole. Using the methods of theoretical analysis and numerical simulation, we determined that the optimal depth of the pre-split blasting was 6 m, the optimal angle for pre-split blasting was 15°, and the optimal spacing of the blasthole was 500 mm. A field test was carried out in the 1010201 ventilation roadway of the Yuwang Coal Mine, China. The on-site peeping results showed that when the spacing of the blasthole is 500 mm, connecting cracks can form under the action of blasting stress. After the working surface is mined, the roof strata could collapse and fill the gob over time when the depth and angle of the pre-split blasting are 6 m and 15°, respectively.

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Study on the method of pressure relief by roof cutting and absorbing energy in deep coal mines

Cited by 4 publications

References 31 publications

The Active Roof Supporting Technique of a Double-Layer Flexible and Thick Anchorage for Deep Withdrawal Roadway under Strong Mining Disturbance

The Active Roof Supporting Technique of a Double-Layer Flexible and Thick Anchorage for Deep Withdrawal Roadway under Strong Mining Disturbance

Engineering Application of AFR Mining Method

Key parameters of gob-side entry retaining by roof cutting in close-distance seam group

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