Simulation study on response characteristics of water—bearing zone in metal mine monitored by resistivity method

Abstract

This study uses a finite element model to numerically simulate the water inrush process of metal mines, and studies the response characteristics of water rich fracture zones in metal mines under different water content conditions and development distances. The results indicate that with the increase of water content in the water rich fracture zone, the resistance value measured by the electrical method also decreases, and the resolution ability for low resistivity anomalous bodies is strong. When the rich water fracture zone is about to reach the measured node, the measured resistance value undergoes an abnormal mutation, specifically manifested as a sudden increase in apparent resistivity value from a decreasing form. When the rich water fracture zone passes through the measured node potential, the apparent resistivity value suddenly decreases. Through numerical experiments, the response characteristics of apparent resistivity and permeability precursors were revealed, and it was clarified that the decrease and abnormal mutation of apparent resistivity are important precursor information for permeability. This has important reference significance for monitoring and predicting permeability disasters in practical engineering.