Integrated geophysical exploration of water-rich abnormalities in coal mine roofs: Example from the 31 123-1 panel, Dongxia Coal Mine

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Water inrush problems in coal mines pose a serious threat to safe and efficient production. How to effectively predict the potential water bodies in abnormal roof and floor strata is the key to water control in coal mines. A single geophysical exploration method has certain limitations and cannot adapt to complex geological conditions, with relatively low data reliability. Multiple geophysical exploration methods have the advantages of rich data and strong reliability and are widely used in water control in coal mines. Taking the 31 123-1 working face of the Dongxia Coal Mine as an example, this paper uses audio electric tomography (AET) and transient electromagnetic methods (TEM) to conduct geophysical exploration analysis of the working face. The results show that no obvious high conductivity anomaly areas were found in the 0–60 and 60–120 m detection zones by AET. No obvious low resistance anomaly areas were found in all directions and different heights of the working face roof by transient electromagnetic detection. AET and TEM have high resolution and reliability in water control exploration in coal mines. The combination of the two can accurately identify the water-rich conditions of the working face roof, effectively reduce the workload of water exploration drilling, and provide important references for related water control work.