Analysis on the Induced Polarization Characteristics of “Three-Phase” in Coal Goaves

Abstract

The induced polarization (IP) method can obtain different response characteristics in the detection of coal goaves, water-bearing goaves, rock fissure water-bearing areas, and has a good distinguishing effect. Based on the theory of soil mechanics, the composition and IP characteristics of “three phase” of coal goaves are analyzed. The “three phase” models are established under different conditions, such as coal goaves and rock fissure water-bearing areas. By conducting a series of experiments, the relationship between the “three-phase”-related parameters (saturation, porosity) and the IP parameters (resistivity, polarizability) was analyzed. Theoretical analysis and experimental results show that: coal goaves are characterized by “high resistivity, low polarizability”, the water-bearing goaves are “low resistivity, medium-high polarizability”, while the rock fissure water-bearing areas are “low resistivity, high polarizability”; the IP parameters are closely related to the saturation and porosity of the coal seams. Combined with the experimental project of Huanglian Coal Mine in Shanxi Province, China, the theoretical analysis results are verified.