基于物理模拟的煤与瓦斯突出主控因素及能量演化过程

Control Factors of Coal and Gas Outburst and Energy Evolution Based on Physical Simulation

配制物理特性与原煤相似的型煤,结合自主研发的煤与瓦斯突出模拟系统,研究煤与瓦斯突出过程中的能量演化过程及突出主控因素。研究表明:突出实验存在临界压力(0.75 MPa),在瓦斯压力0.75~1.25 MPa,模拟地应力5~20 MPa的范围内,突出的煤体质量最大可达28.1%,最远达14.1 m。突出过程中,能量是不断衰减的,表现为高压腔体外端压力传感器率先感应,内侧明显滞后约0.1 s。正交实验表明,瓦斯压力是煤与瓦斯突出的主控因素,但地应力与水分含量同样发挥重要作用。水分由2%上升到7%的过程中,突出强度迅速降低,趋势呈非线性规律。

Briquette coal which has similar physical properties with raw coal was produced for this experiment. Energy evolution process and main factors of coal and gas outburst were researched by the self-made simulation system. The research shows that there is a critical pressure（0.75 MPa） in this outburst experiment. The weight of outburst coal reaches up to 28.1%, and the maximum distance is 14.1 m when the gas pressure and axial load is 0.75 MPa to 1.25 MPa and 5 MPa to 20 MPa, respectively.During the outburst process, the energy is constantly decay. The results show that the pressure sensors outside the high pressure cavity first responded, and the sensors at inner side delayed approximately 0.1 s. Orthogonal experiment shows that the gas pressure is the main factor controlling coal and gas outburst, but the stress and moisture content also play an important role. The outburst intensity rapid decreases with a nonlinear trend when the moisture content increases from 2% to 7%.