杨海平, 刘盛东, 杨彩, 等. 2021. 煤层顶底板采动破坏同步动态监测电性特征分析[J]. 工程地质学报, 29(4): 1002-1009. doi: 10.13544/j.cnki.jeg.2021-0395.
    引用本文: 杨海平, 刘盛东, 杨彩, 等. 2021. 煤层顶底板采动破坏同步动态监测电性特征分析[J]. 工程地质学报, 29(4): 1002-1009. doi: 10.13544/j.cnki.jeg.2021-0395.
    Yang Haiping, Liu Shengdong, Yang Cai, et al. 2021. Analysis of electrical characteristics of mining destruction on coal seam roof and floor with simultaneous dynamic monitoring method[J]. Journal of Engineering Geology, 29(4): 1002-1009. doi: 10.13544/j.cnki.jeg.2021-0395.
    Citation: Yang Haiping, Liu Shengdong, Yang Cai, et al. 2021. Analysis of electrical characteristics of mining destruction on coal seam roof and floor with simultaneous dynamic monitoring method[J]. Journal of Engineering Geology, 29(4): 1002-1009. doi: 10.13544/j.cnki.jeg.2021-0395.

    煤层顶底板采动破坏同步动态监测电性特征分析

    ANALYSIS OF ELECTRICAL CHARACTERISTICS OF MINING DESTRUCTION ON COAL SEAM ROOF AND FLOOR WITH SIMULTANEOUS DYNAMIC MONITORING METHOD

    • 摘要: 随着煤炭开采深度的增加,深部复杂条件下开采的水害问题日益严重。复杂条件下煤层回采过程顶底板破坏动态监测对于工作面突水预测、采煤方法改进等具有重要意义。本文基于并行电法监测技术,结合双模式电极数据采集方式,同时在采煤工作面进行煤层顶、底板全空间地电场特征监测研究,获得了煤层围岩顶底板采动前后电阻率及自然电位同步响应特征。研究表明:顶底板跨孔电阻率监测动态变化可以显示孔间电阻率随采煤工作面逐步推进的动态变化情况,可有效表征顶底板破坏带发育范围,同时顶板垮落造成的电阻率变化程度大于底板破裂引起的电阻率变化程度;自然电位数据可分辨顶、底板岩层及裂隙张合形态、以及破裂程度,研究区域内顶板自然电位值明显高于底板自然电位值,且顶板的破裂引起的自电位变化强度明显大于底板破裂引起的自电位变化。采用多参数对煤层顶底板采动破坏进行同步动态监测,对保障采动工作面安全回采具有现实应用价值。

       

      Abstract: As the depth of coal mining increases, the water hazards in mining under the deep and complicated conditions become increasingly serious. The dynamic monitoring of roof and floor failure in the coal mining process under complex conditions is of great significance to the prediction of water inrush at the mining face and the improvement of coal mining methods. Based on the parallel electrical monitoring technology, and combining the dual-mode electrode data collection method, we monitor and research the geoelectric field characteristics of the full space of coal seam roof and floor at the coal mining face simultaneously. Additionally, we obtain the synchronous response characteristics of resistivity and self-potential of the coal seam roof and floor surrounding rock before and after the mining at the first time. Research findings are as follows. The dynamic change of the cross-hole resistivity monitoring of the roof and floor can show the dynamic variation of the inter-hole resistivity with the gradual advancement of the coal mining face. It can also demonstrate the development range of the roof and floor failure zone effectively. Besides, the degree of resistivity variations caused by the apical plate collapse is greater than the degree of resistivity change caused by the bottom plate rupture. Self-potential data can reflect the roof and floor rock and fissure expansion and closure forms, and the degree of rupture. The self-potential value of the apical plate in the study area is obviously higher than the bottom plate, and the self-potential change intensity caused by the apical plate rupture is obviously greater than the bottom plate rupture. Multi-parameters are used to synchronously and dynamically monitor the roof and floor mining damage of coal seams, which has real application value to guarantee the safe mining of the mining face.

       

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