Evolution mechanism of the dynamic coal-rock breaking effect of an annular fluid self-excited pulsed jet

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (14) : 103-113.

SHOCK

Evolution mechanism of the dynamic coal-rock breaking effect of an annular fluid self-excited pulsed jet

LIU Yanwei1，ZHANG Shixi1，ZUO Weiqin*1，JIA Haojie1，HAN Hongkai1，MIAO Jian1,2，LONG Liqun1

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Abstract

In order to explore the dynamic process of self-excited pulsed fluid jets in annulus breaking coal and rock, the smoothed particle hydrodynamics-finite element method algorithm was used to establish a numerical calculation model of self-excited pulsed fluid jets impacting coal and rock under submerged conditions. The accuracy of the model was verified through theoretical analysis and experimental comparison. The effects of confining pressure, pump pressure and jet type on rock-breaking efficiency were discussed, and the damage mechanism and stress propagation laws during erosion of coal and rock were studied. The results show that under different confining pressures, the erosion depth of the self-priming pulsed jet is significantly increased compared with the self-excited pulsed jet and the ordinary jet, indicating that the self-priming pulsed jet can better break the water cushion effect to a certain extent. When the confining pressure increases from 0MPa to 0.4 MPa, the depth and volume of the erosion pits of self-priming pulsed jet decrease linearly. The depth of the erosion pits decreases by 36.36%, and the volume of the erosion pits decreases by 17.18%. The depth and volume of the erosion pits increase linearly with the increase of pump pressure. In the range of 2 to 8MPa, the depth of the erosion pits increases by 650% and the volume of the erosion pits increases by 847.86%. In the range of 8 to 12MPa, the depth of the erosion pits increases by 23.33% and the volume of the erosion pits increases by 41.92%. Through the laws of coal and rock damage and stress propagation during the erosion process, it is found that along the radial direction, from the center of coal and rock impact to the distal end, the degree of damage and effective stress gradually decreases and tends to be stable, with a certain limit range; along the axial direction, the rapid accumulation of damage and effective stress at the measuring points reaches the peak one after another, and the coal and rock units quickly accumulate to complete damage, forming erosion pits.

Key words

Annular fluid / erosion of coal / Water cushion effect / Stress damage evolution

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LIU Yanwei1, ZHANG Shixi1, ZUO Weiqin1, JIA Haojie1, HAN Hongkai1, MIAO Jian1, 2, LONG Liqun1. Evolution mechanism of the dynamic coal-rock breaking effect of an annular fluid self-excited pulsed jet[J]. Journal of Vibration and Shock, 2025, 44(14): 103-113

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