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In recent years, the regional grouting treatment technology for limestone aquifers of coal seam floor in North China type coalfield has been developed significantly. However, the detection and evaluation of water inrush risk(or treatment effect) after grouting for limestone aquifers has not yet formed a complete technical system. In view of the high cost and low amount of information of traditional grouting evaluation methods(such as water pressure test method, borehole television method, drilling core method, etc.), it is proposed to collect geoelectric data by two-roadways parallel electricity method, to process geoelectric data by the whole space three-dimensional resistivity inversion technology and to draw a three-dimensional resistivity distribution diagram. Combined with the geological structure, hydrogeological characteristics and grouting information of the detection area, the effect of grouting treatment in limestone aquifer of coal seam floor can be evaluated. This technology was applied to the detection and evaluation of the grouting treatment effectiveness to the L8 limestone aquifer of the 2-1 coal seam floor of the 11291 working face in Zhaogu No.1 Coal Mine, which effectively guided the safe production of the working face and achieved good practical effects.

iop conference series. earth and environmental science

Study on Evaluation Technology of Regional Grouting Treatment Effect in Limestone Aquifer of Coal Seam Floor in North China Type Coalfield Based on Two-roadway Parallel Electrical Method