Research on radio electromagnetic wave perspective detection method through borehole-roadway in mine

In order to improve the detection accuracy of the wireless electromagnetic wave perspective technology,make the method to be used in the single heading,and ensure the safe and efficient mining operation,this paper studies the way of transmitting and receiving the electromagnetic wave signal in the mine roadway. With the shielding effect of the rock strata in the borehole,the external interference of the received signal is reduced,which can be used to develop a new detection method using the wireless electromagnetic wave perspective technology from borehole to roadway. This paper analyzes the characteristics of the traditional wireless electromagnetic wave perspective detection method and the main problems existing in the detection process. According to the requirements of the current geological task of mine exploration,a borehole to roadway wireless electromagnetic wave perspective detection method suitable for complex geological conditions is proposed. This paper studies the basic theory of borehole to roadway radio electromagnetic wave perspective,considers that the accuracy of radio electromagnetic wave perspective detection is related to the incident angle of electromagnetic wave,and the attenuation coefficient of radio electromagnetic wave perspective is related to the conductivity and dielectric constant of coal( rock) layer,studies the special receiving antenna device suitable for borehole to roadway radio electromagnetic wave perspective,and studies the construction suitable for borehole to roadway radio electromagnetic wave perspective layout method. Taking the geological model of combination of heading and borehole as an example,the wave field characteristics and signal response laws of electromagnetic wave when it encounters faults and collapse columns in coal seam are studied respectively through simulation,and the response characteristics of electromagnetic wave to geological anomalies are studied. It is found that the detection method of borehole to roadway radio electromagnetic wave perspective is more applicable than the traditional mine radio electromagnetic wave perspective,and can detect the occurrence of concealed structures more accurately. The field test and verification show that the technology can reflect the location of geological anomaly more accurately,and can effectively carry out the geological exploration task in a single head roadway.