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煤岩卸荷过程物理信息监测对煤与瓦斯突出等动力灾害预测研究具有重要意义。应用自主研发的电荷采集装置,进行含瓦斯煤岩围压卸荷瓦斯渗流及电荷感应试验。研究结果表明:含瓦斯煤岩围压卸荷过程中,瓦斯渗流特性及电荷感应规律与煤岩的变形损伤过程具有十分密切的关系。随着围压卸荷速率的提高,煤岩内部大量微观裂纹扩展,促进煤岩变形损伤,增大煤岩内部裂纹间局部束缚电荷突变为自由电荷的概率,使得煤岩主破裂过程产生的感应电荷大幅增多;围压卸荷减弱了煤岩环向所受的限制作用,增加了煤岩内部新的导气通道,煤岩渗透率增大。气体携带煤粉颗粒与煤岩孔道固壁间的摩擦作用形成冲流电流,冲流电流对煤岩电荷信号贡献了附加量,使电荷信号增强。
The monitoring of coal and rock unloading process physical information is of great significance to the prediction of dynamic disasters such as coal and gas outburst. Application of self-developed charge collection device for gas-bearing coal-bearing gas percolation and unloading gas flow and charge sensing test. The results show that the characteristics of gas seepage and charge induction are closely related to the deformation and damage process of coal and rock during the process of confining pressure unloading. With the increase of confining pressure and unloading rate, a large number of microcracks propagate inside coal and rock to promote the deformation and damage of coal and rock, and increase the probability of local bond charge changing into free charge in the interior of coal and rock, making the induction of the main rupture of coal and rock The charge increases greatly. The confining pressure unloading weakens the restraining effect of the coal-rock annulus and increases the new gas-conducting channel inside the coal and the permeability of the coal increases. The flow of pulverized current is formed by the friction between the particles carrying coal and the solid wall of coal and rock pores. The red current contributes an additional amount to the charge signal of coal and rock, which enhances the charge signal.