含瓦斯煤岩围压卸荷瓦斯渗流及电荷感应试验研究

发布时间：2018-07-05 09:21

本文选题：采矿工程 + 含瓦斯煤岩　；参考：《岩石力学与工程学报》2015年04期

【摘要】：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。
[Abstract]:The physical information monitoring of coal and rock unloading process is of great significance to the prediction of coal and gas outburst and other dynamic disasters. The charge-collecting device developed by ourselves is used to carry out gas seepage and charge-induction tests under the confining pressure of gas-bearing coal and rock. The results show that the characteristics of gas percolation and charge induction are closely related to the process of deformation and damage of coal and rock during the process of confining pressure unloading of gas-bearing coal and rock. With the increase of confining pressure unloading rate, a large number of microscopic cracks in coal and rock will expand, which will promote the deformation and damage of coal and rock, and increase the probability of local bound charge changing to free charge between cracks in coal and rock. The inductive charge produced by the main fracture process of coal and rock increases significantly, and the confining pressure unloading weakens the circumferential effect of coal and rock, increases the new gas conduction channel in coal and rock, and increases the permeability of coal and rock. The friction between the gas carrying pulverized coal particles and the solid wall of coal and rock channels forms a current which contributes additional amount to the charge signal of coal and rock and enhances the charge signal.
【作者单位】：辽宁工程技术大学力学与工程学院;
【基金】：国家自然科学基金面上项目(11172121,51274114,51374123)
【分类号】：TD712

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