含瓦斯煤岩围压卸荷瓦斯渗流及电荷感应试验研究

doi:10.13722/j.cnki.jrme.2015.04.000

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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，进行了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，促进了煤岩变形损伤，增大了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。

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关键词 ：采矿工程, 含瓦斯煤岩, 围压卸荷, 瓦斯渗流, 感应电荷, 变形损伤

Abstract：Physical information monitoring are significant for the prediction of dynamic disasters such as coal and gas outburst under the unloading process of coal rock. The gas permeability and charge induction experiment have been done under the confining pressure unloading of containing-gas coal rock by using the charge collection device independently developed. The results show that the gas permeability characteristics and charge induction regularity closely associate with the deformation damage in the process of the confining pressure unloading of containing-gas coal rock. With the increase of confining pressure unloading rate，a large number of micro crack propagation，the coal rock deformation damage has been promoted，the mutation probability from partial bound charge to free charge increases in the internal cracks of coal rock，the inductive charge has a significant increase produced in the main rupture process of coal rock. The confining pressure unloading weakens the hoop restrictions of coal rock. New gas channels are added inside coal rock and it makes the permeability of coal rock increase. Streaming current formed by the friction action between coal particles carried by gas and coal rock holes wall. It contributes additional amount to the coal rock charge signal and enhances the charge signal.

Key words： mining engineering containing-gas coal rock confining pressure unloading gas permeability inductive charge deformation damage

引用本文:

潘一山，罗浩，李忠华，赵扬锋，肖晓春. 含瓦斯煤岩围压卸荷瓦斯渗流及电荷感应试验研究[J]. 岩石力学与工程学报, 2015, 34(04): 713-719.
PAN Yishan，LUO Hao，LI Zhonghua，ZHAO Yangfeng，XIAO Xiaochun. EXPERIMENTAL STUDY OF GAS PERMEABILITY AND CHARGE INDUCTION UNDER CONFINING PRESSURE UNLOADING PROCESS OF CONTAINING-GAS COAL ROCK. , 2015, 34(04): 713-719.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2015.04.000 或 http://www.rockmech.org/CN/Y2015/V34/I04/713

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