Application Of Seismic S Wave Reflection Method In The Mined-out Area At The Coal Mine

In coal mine production, the exploitation of coal seam makes more mined-out areas, the collapse of which will make the ground sink and split, devastate the infield and buildings, and destroy the ecological environments. Hence, it is significant to use geophysical methods efficiently and economically to survey and evaluate the mined-out areas and give feasible control measures. In the latest years, many geophysicists have done research on the subjects and make a lot of practical findings. But as a whole, the research of the survey of mined-out areas is still in a developing stage, and the principles and the means of the survey are faulty. The successful experience and data accumulation on the research in China and aboard mainly include collecting data, investigating and visiting, drilling, experiments indoor and numerical simulation.This paper introduces the new technology to explore mined-out area at coal mine by seismic S wave (transverse wave) reflection method. First of all, according to seismic survey basic principle, we analyze seismic wave kinematics, dynamics characteristic, and carry on the key analysis to the earthquake wave frequency spectrum, and make the detailed comparison between P wave prospecting and S wave prospecting. In the aspect of the processing technology for seismic wave data, we put forward application methods to enhance the resolution of the signal. Then this paper analyses and discusses the destruction law of the mantle rock excavated of the mined-out areas, the geological property and geophysical property. In the end, through the specific exploratory work in Yingcheng coal mine at Jilin province, this paper expounds particularly the practical application process of seismic S wave (transverse wave) reflection method, which includes the treating process and the interpretation process for the seismic material, and supplies the equitable and pertinent geologic disaster evaluation of the whole surveyed field. Finally we sum up some property and symbol about the mined-out areas by analyzing the data of them.