Research on 3D forward simulation of electrical method in underground holes of typical water-conducting and water-bearing bodies in coal mines
The mining depth of coal mines is gradually increasing,and hidden water-conducting and water-bearing bodies have become the main hidden danger of water disasters.In order to further improve the accuracy of electrical method in holes,the finite element meth-od was first used to conduct a full space three-dimensional forward simulation of a typical water-conducting and water-bearing bodies model through potential analysis.The potential calculation formula,boundary problems,variational problems,and mesh generation in three-dimensional forward modeling theory were studied.The basic model was established,and the potential distribution law and its error were analyzed.Based on the three-dimensional forward modeling results of typical models of concealed normal faults,vertical collapse columns,and water-bearing goafs,the potential contour line characteristics and variation rules of each model were summarized.The re-sults show that low resistivity makes potential contours lines sparse,while high resistivity makes potential contour lines dense,and the range of distortion matches the specifications set by the model.The electrical method in the underground hole of a coal mine can effec-tively detect water-conducting and water-bearing bodies with high detection efficiency,close to the target,and good 3D forward simula-tion results,laying a theoretical foundation for inversion calculation to improve detection accuracy.
typical water-conducting and water-bearing bodieselectrical method in holes3D forward simulationpotential distribution
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