Characteristic of geological anomaly detected by combined geophysical methods in a deep laneway of coal mine

Abstract

The driving safety in deep laneway is often affected by many geological anomaly factors in ahead of a laneway end. The variability of rock properties, faults and so geological anomaly have relations with groundwater in rock mass. Therefore, it is necessary to employ various geophysical methods for geological anomaly detection in the front of laneway end in order to avoid mine inundation, which guides the process of driving in a laneway of coal mine. According to the comparative analysis between geological exploration and various geophysical methods used in the 2000m-passageway of −780-south section in Guqiao coal mine of Huainan, the result shows as follows. 1) The abnormity of lithology and faults can be detected and forecasted by the reflected seismic wave in the laneway, long distance prediction and high resolution detecting ability are the main characters of the reflected wave method, and the spectrum characteristics of seismic wave can distinguish the change of lithology; 2) The transient electromagnetic method (TEM) is very sensitive to solve the change of aquosity in terrane ahead of the laneway heading face, and the relatively characteristics between lithology change and its containing water can be identified finely through the direct current resistivity method in laneway; 3) The relatively characteristics between lithology change and its contained water can be identified finely through the direct current resistivity method in laneway. In a limited space of laneway, the combined analysis method using variety of geophysics methods are an effective method to detect geological anomaly and hydrogeology ahead of the laneway end, which can provide a powerful technology for safety and efficient driving in a deep laneway.