The Study Of System And Application Of Remote And Advanced Mine Detection

Abstract:The disastrous geology anomalies are hidden hazard factors during the coal mine tunneling and mining of working face. The disastrous geology anomalies mainly refers to the goaf, abandoned roadway, faults, fissures, karst collapse column, gas enrichment zone, water conducted zone, aquifer and mine fire etc. These anomalies can easily lead to the wall caving, roof falling, water inrushing. The currently used method of most advanced is surface exploration method, yet still this method can hardly detect the goaf and the micro-structure. So conducting research on mine seismic exploration instrument and method is quite necessary.The mine seismic research is facing difficulty and limit. Firstly, there is very little experience from predecessors, very little information about velocity, density etc, which makes the data processing and interpretation harder. Secondly, due to the harsh environment of mining, shot downhole is rigorously limited considering safety, so there are no ready-made mining seismic instruments that have explosion-proof and remote control functions. Thirdly, the traditional mine seismic prediction is applying Radon transformation to eliminate side wave field, but this side wave field is crucial to the mine seismic research. Therefore how to precisely isolate wave field and comprehensively research to the imaging of side field wave is one significant subject for mine seismic.This paper firstly applied the rock physics experiments to study the mine seismic detections using pulse transmission method to study the velocity of the coal from mine area. In the study we used ultrasonic transducer with different frequency to quantitatively analyze the frequency dispersion attribute so as to understand the velocity and dispersion character under ultrasonic condition and to solidify the subsequent seismic modeling and interpretation.We deducted wave equations of2D isotropic medium, and studied the numerical simulation of finite difference method, and then we used this method to simulate several typical disastrous geology bodies and the goaf. The simulation adopted Ricker wavelet as the source wavelet, and use PML as the boundary condition. The wave field snapshots reflect the transmission discipline of how seismic wave propagate in faults, collapse column and goaf so that it provides reference for data interpretation.Security regulation of mine has rigor limit for downhole shots. No instruments are in use downhole neither home nor abroad. Base on the study on the mine seismic prediction instruments both home and abroad we developed a mine seismic instruments which have the function of remote control, explosion proof, water proof, dust proof, low energy consuming, high stability, reasonable design, high efficiency and meeting the demand of security for mine operation.We deducted the travel time curve of wave field for all directions. It deepened the understanding of mine seismic wave transmission principle. And we optimize the observation system aiming at certain mine situations. And we also analyze the typical seismic profiles which are caused by acquisition failure so as to study the mechanism of it and ways to avoid it.Using the Radon transformation to separate wave field, we imaging the advanced and side wave with prestack Kirchhoff migration at the first time ever. We apply the method at Qinshui basin, Luan mine zone,Huozhou mine zone, Fengfeng mine zone,etc. The results demonstrate that this method has a very high success rate, and one whole set of mine seismic research system consisting hardware, seismic acquisition, processing and interpretation is formed.