Numerical simulation of coal breaking characteristics by continuous water jet based on ALE algorithm

HAO Congmeng; CHEN Xuexi; LIU Qingquan; JIN Feiyang

doi:10.13347/j.cnki.mkaq.20221041

Safety in Coal Mines > 2024 > 55(1): 14-21. > DOI: 10.13347/j.cnki.mkaq.20221041

HAO Congmeng, CHEN Xuexi, LIU Qingquan, et al. Numerical simulation of coal breaking characteristics by continuous water jet based on ALE algorithm[J]. Safety in Coal Mines, 2024, 55（1）: 14−21. DOI: 10.13347/j.cnki.mkaq.20221041

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Numerical simulation of coal breaking characteristics by continuous water jet based on ALE algorithm

1.
China Academy of Safety Science and Technology, Beijing 100012, China
2.
School of Safety Supervision, North China Institute of Science & Technology, Sanhe 101601, China
3.
School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China

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Received Date: June 01, 2022
Revised Date: November 21, 2022

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Abstract

Abstract

In order to explore the influence of environmental media on the characteristics of water jet coal breaking, ALE algorithm and LS-Dyna software are used to carry out numerical simulation of continuous water jet impact coal breaking and the characteristics of water jet propagation, coal breaking characteristics and time-varying characteristics of the relationship between the two coal breaking depths under the submerged and non-submerged environments are analyzed. The results show that because of the large loss of water jet, the jet velocity in submerged environment is much lower than that in non-submerged state. Under the obstruction of environmental medium, the submerged jet diverges and increases the area of broken coal, resulting in the increase of the area of broken coal and the decrease of the depth, but the damage element does not change much. It is necessary to prolong the impact time reasonably or reduce the spacing of boreholes when coal caving is carried out in submerged environment.
- gas drainage,
- hydraulic flushing,
- pressure-relief and permeability improvement,
- water jet coal breaking,
- submerged condition

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References

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Numerical simulation of coal breaking characteristics by continuous water jet based on ALE algorithm