IJE TRANSACTIONS A: Basics Vol. 31, No. 10 (October 2018) 1334-1342   

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Xin Wang, Lei Zhang and Kai Zhang
( Received: January 30, 2018 – Accepted: April 26, 2018 )

Abstract    The ground penetrating radar (GPR) was used as a means for coal-rock interface detection which is the key of shearer drum automatic height-adjustment strategy. First, a complex coal seam model was built and the electromagnetic field theory was adopted to study the radar response. The model helps to find that there exist mathematical relationships between the intensity of radar response and coal seam parameters. Next, a series of simulations were made to study the relationship between different parameters and radar responses. The results show that the GPR system is feasible in most cases and the high frequency radar antenna could be selected according to the model to acquire more accurate radar data. Last, the numerical analysis was successfully applied as a theoretical guide in the GPR investigations carried out in the 3721 working face of Guozhuang coal mine. In the GPR investigations, the coal-rock interface was found under different antenna frequency and measurement modes. For the static mode, the deviation of 400 MHz and 900 MHz antenna is 2.3% and 1.5%, respectively. For the continuous mode, the 400 MHz antenna demonstrated excellent performance in an unknown coal seam structure, and the coal rock interface were showed clearly and intuitively though the GPR data.


Keywords    ground penetrating radar (GPR), coal-rock interface, radar antenna, GPR data


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