Comparative Analysis Three Kinds Of Geophysical Methods For Water Exploration In Working Face Floor

The working face floor water is one of the important factors which threate the safety of coal mining,and it is essential to detect water rich area in the working face floor.Floor water detection methods is consist of DC three-dimensional electric method,transient electromagnetic method and audio frequency electric perspective,which are widely used.The three methods are sensitive to the water content of the stratum.Due to the differences between their principle,applicable range and conditions,and with the limitation of the working surface geology and construction conditions,the detection results of the floor water are different.Therefore,the comparison and analysis of the three geophysical methods,such as the DC three-dimensional electric method,the transient electromagnetic method and the audio electro-perspective,have a strong practical value in the selection and applicability of the method for detecting water in the working face floor.Based on the study of DC three-dimensional electric method,transient electromagnetic method and audio electro-perspective principle,according to the characteristics of 1611A face in Zhangji Mine,three kinds of geophysical methods of coal seam are constructed,and their data processing and inversion techniques are combined.This paper analyzes and studies the response degree of three kinds of geophysical exploration methods to the water rich area of the floor,and compares the results of the three methods.According to the characteristics of 1611A working face floor strata,through numerical simulation and physical model experiment,analyses the electrical characteristic of the working face floor,from the aspects of theory and experiment research of coal seam floor water resistivity distribution and parallel method,stereo audio frequency electric penetration detection technology feasibility.The detection results are verified by drilling technology,combined with the actual data of the field and the results of numerical simulation and physical experiment.Based on the actual situation of the three kinds of geophysical methods to detect the results of comparative analysis.The results show that the three geophysical methods have different degrees of response to the detection of the water rich area.The 3D parallel electrical technology can detect the occurrence of abnormal low resistivity body space range;transient electromagnetic induction to reflect the low resistance current field signal,can quickly identify the water rich area,but by the influence of metal in the tunnel is bigger;the audio frequency electric perspective the low resistance in the working surface reflect the most sensitive.But it is easy to be influenced by metal equipment in the tunnel effect.Through the comparative analysis provides an important reference for the study of the three kinds of geophysical methods for coal mine working face floor water exploration methods.The bottom of 1611A working face of Zhangji mine exploration,determine the Zhangji mine working face floor water rich situation,provide technical guidance for mine disaster governance and Zhangji mining in working face,and provide technical reference for similar mine geophysical method selection.