Study On The Quantitative Comprehensive Geophysical Prospecting Of The Water Abundance Of The Coal Seam Floor Limestone

Coal floor limestone water is closely related to the coal mine production safety. Nowadays mine geophysical methods to detect the coal floor limestone water mostly stay on the stage of qualitative interpretation, and because of the multiple solutions of geophysical field, using a single geophysical method to detect the floor limestone water has uncertain risks. Therefore, in order to reduce the uncertainty of single forecasting technique and single geophysical method, this paper attempts to use the comprehensive geophysical method(DC resistivity method, transient electromagnetic method, seismic reflection wave method) to research on the relationship between the characteristics of floor limestone water and geophysical parameters or its quantity, it is practical significance to guide the mine water disaster prevention and treatment.In this paper, based on the steady electric field, transient electromagnetic and elastic wave field, as for the principle of the floor limestone water characteristics, building 3D numerical model and physical model, combining with the engineering example, to obtain the related characteristics of the integrated geophysical parameters and the floor limestone water.Analyzing the test data of numerical simulation and physical simulation, to get the quantitative relation formula between the floor limestone water content and the integrated geophysical parameters(electrical parameters, elastic wave parameters etc). Apparent resistivity value of DC resistivity method and transient electromagnetic method in high resistance limestone background conditions is inversely proportional to the moisture content, seismic reflection wave can be used to determine incomplete limestone area boundary quantitatively;Based on it, through the integrated geophysical exploration to the field of coal limestone water occurrence characteristics and rules of the mine, conclusing the quantitative relationship between the coal floor limestone electrical parameters, elastic wave characteristics and water, getting low resistivity zone water gushing quantity formula and initial surge prediction formula of drilling water, and forecast verification on the other water alleys, achieving good result. Through the integration of single geophysical method, putting forward a set of integrated geophysical method to detect water quantitatively.Based on these research, obtaining the quantitative relationship of comprehensive geophysical parameters and the floor limestone water, and theoretical research and practical application need to be further carried out.