Quantitative study on dynamic effects and energy dissipation characteristics during coal and gas outbursts
YANG Xuelin
WEN Guangcai
SUN Haitao
YAN Fazhi
CHENG Xiaoyang
CAO Jie
YANG Huiming
ZHENG Pufang
YANG Mei
Abstract：Coal and gas outbursts are dynamic disasters in coal mining characterized by complex energy release processes.To quantitatively investigate the dynamic effects and energy dissipation characteristics,a representative outburst coal sample from Longtan Coal Mine is selected as the research object.Using a self-developed coal and gas outburst simula-tion system,the effects of gas pressure and coal capacity on outburst intensity are examined.A multiple linear regression model is also established to predict the mass of outburst coal.Experimental results show that increasing gas pressure signi-ficantly shortens the cavity pressure release time(from 0.789 s to 0.232 s)and increases peak velocity of two-phase coal-gas flow front(8.73 m/s to 51.52 m/s).Besides,the coal fragmentation is intensified,with the equivalent particle size de-creasing from 330 μm to 192 μm and new surface area increasing from 1.495 m2/kg to 9.662 m2/kg.Increasing the coal loading prolongs the pressure release time by 51%and enhances outburst intensity(rising from 25.25 kg to 40.74 kg).The multiple linear regression model reveals a strong linear relationship between the mass of outburst coal(B),initial gas pres-sure(P0),and coal loading(M)(with a fitting coefficient R2=0.96),expressed by the regression equation:B=10.146+26.62P0+0.41M.Only 6.5%to 15%of the gas expansion energy adsorbed by the coal contributes to the outburst,specific-ally,coal fragmentation and ejection,while the remaining energy dissipates through slow gas emission.Of the energy in-volved in the outburst,about 90%is consumed in coal fragmentation and approximately 10%in coal ejection.Gas pres-sure plays a decisive role in the conversion of gas expansion energy:as gas pressure increases,the amount of adsorbed gas expansion energy involved in the outburst increases,thereby raising the mass of outburst coal.Although a greater coal loading leads to a higher total expansion energy,the proportion contributing to the outburst remains constant,resulting in increased absolute but unchanged relative outburst intensity.
Keywords：coal and gas outburstgas expansion energygas pressureoutburst intensityenergy dissipation
Publication Date：2025-09-27
Online Publishing Date：2025-10-22(First online date of this platform, not the publication date of the document)
Pages：16( 4207-4222 )