煤体剪切破坏电荷感应规律试验研究

发布时间：2018-01-02 21:25

本文关键词：煤体剪切破坏电荷感应规律试验研究　出处：《安全与环境学报》2016年03期 　论文类型：期刊论文

【摘要】：为研究煤体剪切破坏过程中的电荷感应规律,基于变角板法对某矿区煤体在不同剪切角度破坏下进行电荷监测,探究了煤体在剪切破坏过程中的力-电感应变化规律。结果表明:随剪切角增大,煤体发生剪切破坏的强度逐渐减弱,失稳破坏形式由压剪破坏向张拉破坏过渡;煤体剪切破坏过程中有显著电荷感应信号产生,电荷信号异常区域对应于剪应力突变阶段;随剪切角增大,煤体应力峰值前电荷信号逐渐减少并不断向剪应力峰值附近集中,剪应力峰值前累计的电荷量也逐渐减少;提出了煤体剪切破坏过程中产生电荷的机理主要为摩擦作用的观点;电荷感应信号峰值在剪应力达到极限强度之前出现,电荷信号峰值比剪应力峰值提前出现时间随剪切角度增加有减短趋势;在首次出现电荷峰值信号之后短时间内煤体将发生较大幅度的应力跌落过程;可以以电荷信号峰值的出现为基点来预测煤体将要发生变形破坏及通过电荷信号的整体分布特征来揭示煤体剪切破坏规律。
[Abstract]:As the charge induction rules in the process of destruction of the coal body shear, variable angle plate method in a mining area of coal charge monitoring at different shear angle of failure based on the exploration of coal in the shear process of stress variation of electric induction. The results showed that with the shear angle, shear failure of coal body the intensity gradually weakened, the failure form of shear to tensile failure transition; significant charge induction signal generated in the shear failure process of coal body, the corresponding charge signal abnormal area by the shearing stress mutation stage; with the shear angle increases, the peak stress of coal before the charge signal and to continue to gradually reduce the shear stress concentration near the peak stress, the peak shear stress before the amount of charge accumulated gradually reduced; mechanism of charge generation is put forward in the process of coal shear failure is mainly friction point; the charge induction signal peak in shear stress reached the pole Limit strength before the peak charge signal than the peak value of the shear stress shear angle increases with time in advance have reduced trend; after peak charge signal within a short time of coal will occur larger stress drop for the first time; to peak charge signal as the starting point to predict coal will happen to reveal the overall distribution of coal shearing by the charge signal failure pattern and deformation.

【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)
【分类号】：TD315
【正文快照】： 0引言随着我国浅部煤炭资源的逐年减少,煤矿开采逐渐转向深部,使得冲击地压、瓦斯突出和突水等日趋严重的矿山动力灾害变得势不可挡。煤矿开采的动灾监测方法和手段的研究已成为保障煤炭资源安全高效开采的重要科学问题。现有研究成果[1-4]表明,煤体变形破裂过程产生的电荷信

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