| The water in the roof and floor of coal seam and water in the goaf seriously threaten and restrict the safe production of coal mines.And serious water inrush disaster accidents occur from time to time in Guizhou province mining areas.Due to the complex and the large drop of terrain,the steep cliffs and other factors in Guizhou mining areas,conventional Direct Current method cannot meet the detection requirements.Also,affected by the large height difference on the ground and dense vegetation,wiring and measurement of the loop device of transient electromagnetic method is troublesome and the work efficiency is very low.In view of the complex geological conditions of the survey area,the selection of the electrical source transient electromagnetic method with the characteristics of strong maneuverability,high construction efficiency,strong signal,low field labor intensity,and strong ability to distinguish geoelectrical cross-sections for complex area detection application research has strong practical significance.In the paper,commercial software COMSOL is used to carry out the forward modeling of the electrical source transient electromagnetic method for complex terrain,and verified that the electrical source transient electromagnetic method can more accurately detect the plane and spatial distribution position of the deep anomaly area under complex terrain conditions.Based on the measured data of the Bailong Mountain wind power project and the coal mine detection project in Fuquan city,and combined with the numerical results,the response characteristics of the water-filled goaf are studied,which supplied the theories and techniques for the investigation of groundwater plane and the spatial distribution range and law under complex terrain.The research results show that the electrical source transient electromagnetic method has a very good application scenario in the detection of goafs in complex terrain areas,and it is worthy of promotion.The thesis has 21 figures,3 tables and 68 references. |
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