Failure characteristics and control techniques for mining roadway affected by stress accumulation of residual pillars in contiguous coal seams

Li, Wenlong; Tu, Shihao; Tu, Hongsheng; Liu, Yu; Liu, Xun; Miao, Kaijun

doi:10.1016/j.engfailanal.2022.106646

Cited by 24 publications

(8 citation statements)

References 7 publications

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“…Coal is the lifeblood of China’s national economy, and its consumption has accounted for more than half of China’s energy consumption for many years 1 , 2 . The emulsion pump station is the power equipment of the hydraulic support in the coal mining working face.…”

Section: Introductionmentioning

confidence: 99%

Wear analysis of slideway in emulsion pumps based on finite element method

Wang,

Li,

Liu

et al. 2024

Sci Rep

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Wear is a common issue in the operation of emulsion pumps. When it becomes severe, it can lead to machine downtime and economic losses. This paper aims to investigate the wear phenomenon on the slideway of emulsion pumps using Archard’s wear model and the finite element method. The fretting friction and wear experiment was used to calibrate the parameters of the numerical model. Based on the established numerical model, a parametric analysis is conducted on the slideway experiencing the most severe wear. It is observed that the wear amount initially increases and then decreases as the crankshaft speed increases. Furthermore, a smaller clearance between the slide and the slider results in a reduced wear amount on the slideway. This study presents an effective numerical simulation method for studying the wear of emulsion pumps.

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Section: Introductionmentioning

confidence: 99%

Wear analysis of slideway in emulsion pumps based on finite element method

Wang,

Li,

Liu

et al. 2024

Sci Rep

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“…[1] Coal seams are usually mined in a downward direction, with the lower seams being mined after the upper seams have been mined, and some coal pillars are usually left in place during the mining process for safety reasons, resulting in stress concentrations at the pillars left in place after the seams have been mined. [2][3][4][5][6] The lower coal seams are highly susceptible to mineral pressure manifestation during mining. [7][8][9][10] In this regard, scholars at home and abroad have done a lot of research.…”

Section: Introductionmentioning

confidence: 99%

Destruction mechanism and control technology of peripheral rock of shallowly buried large mining height roadway under concentrated coal pillar

Yun,

Zhang,

Liu

et al. 2024

Preprint

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To study the damage mechanism of the return roadway of shallow burial depth, thin bedrock, and large mining height working face under the action of concentrated coal pillar. In this paper, we take the 22408 return roadway of Bulianta Mine as the research background and focus on the problem that the mine pressure appears drastically when it passes over the overlying concentrated coal pillar. Through theoretical analysis and numerical simulation, the mine pressure manifestation law of 22408 working face back to the mining roadway is studied. We analyzed the reasons that led to the drastic manifestation of mine pressure in the 22408 return roadway over the overlying concentrated coal pillar, revealed the damage mechanism of the roadway under this condition, and put forward a reasonable and effective method of controlling the stability of the surrounding rock for this problem. (1) Propose to utilize hydraulic fracturing to control the problem in advance, and set up a drilling field in the 22407 return tunnel to fracture the medium-grained sandstone 20m above the 2–2 coal in advance; (2) Strengthen the support of the area affected by the coal pillar in advance, and replenish three Φ21.6×8150 mm anchor cables with the spacing of 1200 mm-1500 mm-1500 mm-1200 mm on the roof of the tunnel; (3) Strengthen the support of the area affected by the coal pillar in advance; (4) Strengthen the support of the area affected by the coal pillar in advance, and strengthen the support of the area affected by the coal pillar in advance. At this time, three Φ21.6×5150 mm anchor cables with PVC belts were installed on the side gang of the return tunnel, and the optimized return tunnel was monitored on site, and the effect was good.

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“…Coal is an important energy pillar in China, accounting for more than half of the national energy consumption, and China's coal consumption accounted for 50.72% of the world's total in 2017 [1,2]. Te thick coal seam refers to the coal seam whose thickness is greater than 3.5 m. China has rich reserves of the thick coal seam.…”

Section: Introductionmentioning

confidence: 99%

Study on Coal Gangue Identification Based on Vibration and Its Adaptability to Coal-Caving Process Parameters

Wan

Wang

et al. 2023

Shock and Vibration

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The broken top coal and gangue in the fully mechanized cave mining will be released from the rear of the hydraulic support in the form of bulk. In this process, the medium properties through the coal opening can be judged by monitoring the vibration signal on the tail beam. Based on the coupling method of the discrete element method (DEM) and the finite element method (FEM) in LS-DYNA, this article simulates the whole process of coal caving, establishes the finite element model of the tail beam of hydraulic support and the discrete element model of coal gangue particles, and analyzes the influence of coal caving step distance, mining and caving ratio, and pitching angle of the mining field on the application effect of the vibration identification method. The coal caving step distance has a great influence on the recognition effect, and some bottom coal should be appropriately sacrificed to reduce the gangue content. The application effect of the vibration identification method is good under different mining and caving ratios. Downward mining can cause gangue to be released in advance, making the recognizable signal lag behind the change of gangue content, while upward mining will lose a part of the coal, but the application of vibration recognition is better than downward mining.

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Failure characteristics and control techniques for mining roadway affected by stress accumulation of residual pillars in contiguous coal seams

Cited by 24 publications

References 7 publications

Wear analysis of slideway in emulsion pumps based on finite element method

Wear analysis of slideway in emulsion pumps based on finite element method

Destruction mechanism and control technology of peripheral rock of shallowly buried large mining height roadway under concentrated coal pillar

Study on Coal Gangue Identification Based on Vibration and Its Adaptability to Coal-Caving Process Parameters

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