A Joint Numerical Simulation Method for Mine Seismic-Electric Coupling
Abstract
With the continuous increase in coal mining depth in China, concealed geological structures—such as collapse columns and faults—pose a severe threat to mine safety by inducing water inrush accidents. Mine DC resistivity methods exhibit high sensitivity to the water-bearing characteristics of geological bodies but suffer from limited resolution. In contrast, mine seismic exploration offers high resolution but shows weak responses to water-rich bodies. Single-method inversion inevitably faces the issue of solution non-uniqueness. This study aims to enhance the detection accuracy of concealed structures by implementing a joint seismic-electric inversion, leveraging the complementary advantages of both methods. For the DC resistivity component, a forward model was established using the finite element method with unstructured meshes, and inversion was performed using a least-squares algorithm. For seismic exploration, forward modeling utilized curved-ray tracing, and inversion was conducted via the LSQR algorithm. Cross-gradient constraints were incorporated into the joint inversion to establish a structurally coupled framework. Numerical simulation results indicate that while single-method inversions (DC or seismic) can preliminarily identify anomalies, they are limited by issues such as anomaly diffusion and false anomalies. In contrast, the joint in-version effectively constrains the spatial extent of anomalies, accurately characterizes the morphology and location of multiple…
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