Particle Size Distribution and Energy Dissipation in Drop Hammer Impact Damage of Gas-Containing Coal.

Coal and gas outburst is the mechanical damage behavior of gas-containing coal in a complex environment. In this paper, the established experimental system is used to carry out hammer damage experiments on coal adsorption of different gases under different gas pressures and analyze the mass distribution and surface area distribution characteristics of coal samples in each particle size interval after the hammer damage of coal samples. The energy of the crushing process was analyzed by using the specific work of crushing, mass of newly generated particle size added per unit of energy, newly added surface area per unit of energy, and newly added specific surface area per unit of energy. The results show that the crushing effect of gas-containing coal samples during hammer damage is related to the type and pressure of the adsorbed gas. The stronger the gas adsorption performance and the higher the gas pressure, the weaker the effect of gas-containing coal hammer damage. Meanwhile, the energy required for the mass and surface area of coal samples with newly generated particle size decreased, indicating that the stronger the gas adsorption and the higher the gas pressure, the more serious the energy dissipation in the hammering damage process of gas-containing coal samples. The research results are conducive to an in-depth understanding of the coal and gas outburst processes, which can provide a theoretical basis for the damage characteristics and energy dissipation of coal and gas outbursts.