A Study On The Exploration Of Metal Mine Concealed Goafs Based On The GPR

The development of human cannot going without the development and utilization of mineral resources,but in the process of continuous exploitation of underground resources left a lot of goaf which has serious influence on today's underground safety mining,that need an effective way to explore concealed goaf.Ground penetrating radar with its simple operation,wide explore-precision and using-environment advantages that has be applied to all kinds of bad geological exploration engineering.The paper is based on the topic of using GPR in metal mine to explore the concealed goaf,the contents of the research are as follows:1?Study The forward modeling theory of goaf,and based on the finite difference time domain method FDTD Gpr Max2 D software,combined with the adverse geological factors affecting the construction of different shapes,analyzed the geological environment of the numerical model,Through the comparative analysis of electromagnetic wave reflection hyperbola,provide technical support for the exploration of concealed interference elimination of goaf.Analysied the situation of goaf filling at the scene,then established the corresponding filling model forward,obtained the different filling image characteristics that provide theoretical basis for exploring the concealed goaf.2?Study the electromagnetic waves in a consumption medium propagation attenuation theory,and it's waveform and spectrum characteristics spread in different relative dielectric constant of the medium,Put forward a method to distinguish the hidden mining goaf filling.Get the change rule of electromagnetic wave of different filling through the indoor experiment,namely: compared to the complete rock,The not filling goaf waveform amplitude increased with high frequency band broadening;the concealed water filling mining goaf wave amplitude at the top of the line increases,below decreases and with low-frequency band broadening;it also changed little when filled gravel.3?Using RIS-K2 GPR system to the open pit of concealed goaf for field exploration,and with the paper proposed identification method to identify the filling condition of the explored concealed goaf,and according to the identification,to identify risk rating of the explored concealed goaf,then made corresponding treatment scheme.The processing results show that the extraction and identification of goaf can effectively eliminate its hazard.