Comprehensive Exploration And Interpretation For Limestone Water In Taiyuan Formation In The Floor Of Coalface 12223 In Pan’er Mine

The Coalface 12223 in Pan’er Mine has many oblique faults,and its floor Limestone in Taiyuan Formation only 20 m or so to the coal.In order to ensure the working safety in production,it need to probe the layout of limestone water areas and adopt measures to eliminate limestone water disasters threat.The DC electrical method and audio perspective method,have been widely applied in detection of bottom water disasters.Because of the same result of geophysical prospecting method has multiple interpretations,it need to adopt comprehensive geophysical prospecting method,and more accurately find out the rich water areas of the coal floor limestone for the water disasters prevention and control work.Combined with the existing geological data,the method of numerical simulation model is built similar to its coal floor strata and lithologic characteristics,and the forward modeling calculation is carried out from the electric field distribution and the apparent resistivity anomaly characteristics.The forward results can well reflect the electrical model.According to the actual conditions of coal 12223 working face of group A,adopted complex geophysical prospecting technologies to realize the characteristics of floor strata electrical distribution,adopt the three-dimensional electrical method and the audio frequency electric perspective to probe the rich water areas of the coal floor limestone in the existing working face dual roadways.The three-dimensional electrical method and multi-electrode resistivity method can be well applied in probe the low resistivity anomaly areas along the boundary of dual roadways and the audio frequency electric perspective has sensitive reflection with the rich water areas of the middle part in the working face.Comprehensive consider and analyze the characteristics from different geophysical prospecting orientations and the existing working face geological data,divide and delineate the low resistivity anomaly areas.The results show that the coalface floor has weak water content in limestone in total;on the basis of resistivity value and influence depth,five relatively rich water areas are delineated.The existing drilling drain data well verified the working face floor water detection result,which can provides good guidance to limestone water disasters prevention for coalface 12223 and other coalfaces of group A coal seam in Pan’er Mine.