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基于地下水渗流中地电场响应的矿井水害预警试验研究

ISSN号：1000-6915
期刊名称：《岩石力学与工程学报》
时间：0
分类：TD163[矿业工程—矿山地质测量]
作者机构：[1]中国矿业大学资源与地球科学学院,江苏徐州221008, [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008, [3]安徽惠洲地下灾害研究设计院,安徽合肥230088
相关基金：国家重点基础研究发展计划（973）项（2007CB209400）

作者：刘盛东[1,2], 王勃[1], 周冠群[3], 杨胜伦[1], 陈明江[1]

关键词：采矿工程, 地下水渗流, 地电场, 网络并行电法, 煤矿底板水, 等时线, mining engineering, groundwater seepage, geoelectric field, network parallel electrical method, mine floor water, isochrone

中文摘要：

通过建立渗流-电测模型，在渗流过程中采用网络并行电法仪进行时空域地电场参数试验，首次取得渗流中地电场参数的空间瞬态响应。以电位、电流等时线和视电阻率等时面特征为依据，发现渗流过程中自然电场在时空域均表现为上升趋势，自然电位等时线的极值点指示渗流位置，并具有超前感应能力。激励一次场电压、电流可以精确确定渗流液面与渗流速度，适合于非均匀地质体渗流规律的研究。实时视电阻率图像具备跟踪识别渗流区域和相对水量变化的能力，随着视电阻率变低，地下水渗流趋向饱和。通过对五沟煤矿的实际地电场监测，提前2d成功预报了1013工作面底板出水，巷道自然电位极值点指示出水位置，视电阻率等时面指示出水水源层位。采用井下地电场的空间同步监测技术，可用来进行煤层底板水害的实时监测研究，在矿井突水灾害防治中具有应用前景。

英文摘要：

Through the establishment of model of seepage-electric test, the temporal-spatial domain parameters of geoelectric field in the course of seepage are achieved by the network parallel electrical instrument（NPEI）. For the first time, the geoelectric field transient response is obtained in space. Based on the characteristics of potential and current isochrones and apparent resistivity isochronous section, the experiments show that natural electric field represents rising trend in the temporal-spatial field in the course of seepage. The isochronal extreme point of natural potential indicates the position of seepage; and natural electric field possesses ahead of water surface. The fluid surface and the seepage velocity can be accurately ascertained through exciting voltage and exciting current of primary field; and it is suitable for revealing asymmetric seepage law of geologic body. The real-time apparent resistivity images have the ability to track and identify seepage zones and the quantity of water. With apparent resistivity stepping down, groundwater seepage tends to be saturated. Through the practical geoelectric field monitoring in the Wugou Mine, the water inrush of 1013 working face is successfully predicted ahead of two days. The isochronal extreme point of laneway natural potential indicates the position of water inrush. Apparent resistivity isochronal section indicates water-head horizon of water inrush. The spatial synchronization monitoring technology of geoelectric field is adopted in mine; and the real-time monitoring of the coal floor water disaster will be feasible. It possesses extensive application to mine water inrush prevention and controlling.

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