含水煤体失稳破坏电荷感应规律试验研究

摘要

In order to study the charge induction law during instability and failure process of aqueous coal, and ex-plore the feasibility of applying charge induction method to monitor water bursting disasters in mine, the self-devel-oped charge sensors were used to monitor charge signals of aqueous coal under uniaxial compression, and the varia-tion laws of stress and charge signals in the process of coal compression were analyzed.The results showed that both of drying coal and aqueous coal will generate free charge under uniaxial loading process, and the charge signals fluctuate in a pulsed shape.By analyzing the variation laws of charge signals for aqueous coal and counting the pulse numbers and pulse width of charge before reaching the peak intensity of coal, the influence mechanism of wa-ter on coal charge were summarized from three aspects.( 1 ) Water will influence the charge signal by weakening the strength of coal.(2) Flowing charge forms in Stern electrical double layer and enhances the charge signal of coal.(3) The presence of water increases the residence time of free charge on fracture surface of coal.%为研究含水煤体失稳破坏过程中电荷感应规律，探寻应用电荷感应法监测煤矿突水灾害可行性，利用自主研制的电荷传感器对含水煤体单轴压缩过程进行电荷信号监测，分析煤体压缩过程中应力及电荷信号变化规律。试验结果表明：烘干煤体和含水煤体单轴加载过程中均有自由电荷产生，电荷信号呈脉冲状波动，通过分析含水煤体电荷信号变化规律同时统计煤体峰值强度前电荷脉冲数及脉冲宽度，从水通过削弱煤体强度进而影响电荷信号；Stern双电层中形成流动电荷，增强了煤体电荷信号；水的存在增加了煤体破裂面自由电荷存留时间三个方面总结了水对煤体电荷的影响机理。