Triaxial apparent resistivity characteristics of slab-shaped low-resistivity body ahead of tunnel excavation face

HU Xiongwu; WANG Ying; YU Hao

doi:10.13347/j.cnki.mkaq.20250172

Abstract：Advanced detection of water abundance in rock strata ahead of roadway excavation is critical for ensuring mining safety.Conventional mine electrical prospecting techniques,constrained by axial observation system layouts,suffer from insufficient azi-muthal discrimination of electrical anomalies,significantly limiting their practical application efficacy.To address this technical bot-tleneck,a novel triaxial apparent resistivity detection method for roadway excavation is proposed and its detection workflow is delin-eated.By establishing a theoretical model of an infinite low-resistivity slab-shaped anomaly within a full-space homogeneous medi-um,a three-dimensional observation coordinate system including roadway axial(x),lateral(y),and vertical(z)directions was con-structed to derive analytical expressions for triaxial apparent resistivity responses.Numerical simulations and theoretical analysis were conducted to investigate the influence of slab-shaped anomaly attitude parameters(azimuth and dip angles)on triaxial apparent resistivity response characteristics.The study reveals that:the x-direction apparent resistivity curves exhibit stable"H-type"pattern,independent of anomaly azimuth and dip angles,though their anomaly amplitudes and detection pole distances at extremum points are significantly affected by attitude parameters;y-direction curves demonstrate high sensitivity to azimuth angles but negligible de-pendence on dip angles,with their curve types predominantly governed by azimuth variations;z-direction curves display comple-mentary behavior to y-direction responses,showing high sensitivity to dip angles while remaining largely unaffected by azimuth vari-ations,with curve types primarily determined by dip parameters.Compared to traditional axial electrical methods,the proposed ap-proach enables multi-dimensional electrical characterization of anomaly attitudes,preserving conventional axial method advantages while achieving enhanced anomaly resolution by integrated interpretation of triaxial apparent resistivity.