气体围压条件下煤体单轴压缩破坏的电位特征研究

发布时间：2018-05-24 21:21

本文选题：煤体破坏 + 单轴压缩　；参考：《煤矿安全》2017年06期

【摘要】：为了研究煤体在单轴加载情况下瓦斯环境对煤体电位的影响效应,搭建了氮气围压条件下煤体单轴压缩破坏观察监测系统,测试了不同围压条件下煤体单轴加载的电位变化情况,探讨了煤体加载破坏和瓦斯对电位的影响机理。实验结果表明,煤体在围压条件下加载破坏能够产生电位信号,且电位信号与应力和气体压力的变化趋势具有一定的关联性;对于同一类型煤样,随着充入氮气压力的增加,煤体应力结构改变,在煤体主破裂发生前电位信号波动幅度增加0.2 m V左右,振幅突变明显增大,电位差值从0 m V增大至2 m V左右;在煤体主破裂发生时,电位信号明显增大。
[Abstract]:In order to study the effect of gas environment on coal potential under uniaxial loading, a single axial compression failure observation monitoring system for coal body under nitrogen confining pressure was set up. The potential change of coal body under uniaxial loading under different confining pressure was tested, and the influence mechanism of coal loading damage and gas to potential was discussed. The results show that the potential signal can be generated by loading failure under confining pressure, and the potential signal is related to the change trend of stress and gas pressure. With the increase of nitrogen pressure, the stress structure of coal body changes and the fluctuation amplitude of potential signal increases by 0.2 m V before the main fracture of coal. The amplitude difference increased significantly, the potential difference increased from 0 m V to 2 m V, and the potential signal increased obviously when the main fracture occurred.
【作者单位】：中国矿业大学安全工程学院;中国矿业大学煤矿瓦斯治理国家工程中心;中国矿业大学煤矿瓦斯与火灾防治教育部重点实验室;
【基金】：“十三五”国家重点研发计划资助项目(2016YFC0801404) 国家自然科学基金资助项目(51674254)
【分类号】：TD713

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