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电荷感应法检测煤层注水防冲效果研究

王岗, 潘一山, 肖晓春

王岗, 潘一山, 肖晓春. 电荷感应法检测煤层注水防冲效果研究[J]. 岩土工程学报, 2019, 41(2): 311-319. DOI: 10.11779/CJGE201902009
引用本文: 王岗, 潘一山, 肖晓春. 电荷感应法检测煤层注水防冲效果研究[J]. 岩土工程学报, 2019, 41(2): 311-319. DOI: 10.11779/CJGE201902009
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WANG Gang, PAN Yi-shan, XIAO Xiao-chun. Detection of effects of rock burst prevention by water injection into coal seam using charge induction method[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(2): 311-319. DOI: 10.11779/CJGE201902009
Citation: WANG Gang, PAN Yi-shan, XIAO Xiao-chun. Detection of effects of rock burst prevention by water injection into coal seam using charge induction method[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(2): 311-319. DOI: 10.11779/CJGE201902009
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电荷感应法检测煤层注水防冲效果研究  English Version

  • 1. 辽宁工程技术大学力学与工程学院,辽宁 阜新 123000;
    2. 辽宁大学,辽宁 沈阳 110036

基金项目: 国家重点研发计划项目（2016YFC0801403-4,2017YFC0804208）; 国家自然科学基金面上项目（51774164,51374123）
详细信息
    作者简介:

    王 岗(1992- ),男,博士研究生,研究方向为煤岩动力灾害的预测与防治。E-mail:wg_0404@163.com。

    通讯作者:

    潘一山，E-mail：panyish_cn@sina.com

Detection of effects of rock burst prevention by water injection into coal seam using charge induction method

  • 1. School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, China;
    2. Liaoning University, Shenyang 110036, China

摘要

    摘要
  • 摘要: 为了探究电荷感应法检测煤层注水防冲效果,采用试验方法开展了不同含水率煤样单轴压缩破坏电荷规律的研究。理论分析了水对煤样物理力学性质和煤样产生电荷信号特征影响的规律,并对现场煤层注水过程进行了电荷感应现场监测,分析了注水前、中、后电荷信号变化规律以及产生原理。研究结果表明：水的存在减弱了煤样内部颗粒之间的摩擦作用,促进了微孔裂隙的增长与发育,导致水对电荷信号的产生起到弱化作用,出现有应力降而无电荷信号产生以及电荷信号滞后的现象;随含水率增高,煤样电荷均幅呈指数函数递减趋势;得到了煤样电荷均值与含水率的关系式,进而得到耿村煤矿符合煤层注水防冲要求的含水率增量对应的电荷降幅理论百分比为50.13%。由此可根据现场煤层注水前、后电荷降幅实际百分比与理论百分比相比较,就可对煤层注水防冲效果进行初步评价;现场监测结果表明煤层注水前和注水过程中,监测的电荷幅值较大,注水后电荷幅值与注水前相比降幅为52.65%,大于试验室理论结果,符合煤层注水要求。因此,电荷感应方法可以用来检测煤层注水防冲效果,但还需要大量的试验室以及现场试验进行不断的修正和完善。
    Abstract: For detecting the effects of rock burst prevention by water injection into coal seam using the charge induction method, an experimental method is adopted to study the charge laws during the destruction process of coal samples with different moisture contents under uniaxial compression. The influences of water on the physical and mechanical properties of coal samples and the characteristics of the generated charge signals are analyzed. The charge induction method is used to monitor the process of water injection into coal seam. The change laws of charge signals and the principles of their production before, during and after water injection are analyzed. The results show that the presence of water weakens the friction between particles inside the coal samples and promotes the growth and development of micro porous cracks, causing water to weaken the production of charge signals. There is a phenomenon of stress drop without charge signal generation and hysteresis of charge signals. With the increase of moisture content, the average amplitude of charge of coal samples decreases exponentially. The relationship between the average amplitude of charge and the moisture content of coal samples is obtained, so the theoretical percentage of the charge drop corresponding to the increment of moisture content that meets the requirements of rock burst prevention in Gengcun coal mine is 50.13%. Therefore, the effects of rock burst prevention by water injection into coal seam can be evaluated according to the comparison between the actual and theoretical percentages of charge amplitude drop. The results of field monitoring show that charge amplitude is larger before and during water injection. The charge amplitude after water injection decreases by 52.65% compared with that before water injection, which is greater than the theoretical one of laboratory tests and meets the requirements of water injection into coal seam. Therefore, the charge induction method can be used to detect the effects of rock burst prevention by water injection into coal seam. However, a large number of laboratory and field tests are also required to correct and improve the proposed method continuously.
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  • 收稿日期:  2017-12-17
  • 发布日期:  2019-02-24

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