Integrated Simulation Test for Distortion and Failure of the Top Rock by Seismic Wave CT and Resistivity Method in Mining Workface Model

Abstract

The height of “two belts” for overburden distortion and failure in mining workface is very important to coal mine safety production. The height results can be gained through mine geophysical method. The geological model of 32 coal seam in 33 mining field of one mine in Huaibei is selected in the article. The model system of coal mining is formed through the technique of the indoor similar simulation, and the union test system of the bore-laneway resistivity method and seismic wave CT method is found. Through simulating mining process of workface, the distribution of the resistivity and wave velocity in the top rock of detecting field is tested and analyzed. The understanding of development regularity for the distortion and failure of top rock during mining of coal seam is obtained, and it can provide correct guidance parameters for practical production in mine. The results of integrated simulation show that the bore-laneway detecting system can give clear resistivity reaction of distortion and failure, and the seismic wave CT method can provide complete velocity distribution of rock development. The integrated system has high resolution for distortion of the top rock, and can give correct height of “two belts”. The simulating achievement is coincided with the practical detection in mine, and it is helpful to renewal and develops the theory and practice of testing technique of overburden failure in mine.