Application of detection of overlying aquifer and goaf on working face based on high-density electrical sounding
In order to identify in advance the hidden water-rich abnormal structures in the overlying aquifer and goaf of the 214203 working face of Hanjiawan Coal Mine,and to provide effective technical support for mine water prevention and con-trol,we use high-density electrical sounding technology to carry out high-precision detection to the overlying aquifer and goaf area.The distance between each measuring point is set at 30 m,and the distance between each running pole is 10 m.An ex-plosion-proof direct current meter is used to measure each measuring point.By establishing a specific electric field in the formation,it is found that as the working face advances,new water-rich abnormal areas may be formed in the detection area due to stress disturbance and interference from external conditions.At the same time,the water-containing/water-conducting structure of the roof of the 214202 working face of Hanjiawan Coal Mine is analyzed.According to the detection results,5 abnormal areas are divided and their distribution range and type are analyzed.The resistance force near different layers was analyzed,and it is found that the abnormal lateral distribution positions are basically corresponding and the abnormal distri-bution characteristics are similar,thus effectively identifying the water-rich abnormal area and determining the occurrence status and location of the abnormal water hazard area to ensure the safe and efficient production of the mine.
high-density electric sounding technologydirect current methodwater-rich anomalous areaelectrical inver-sionwater hazard prevention and control
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