APPLICATION AND STUDY OF FOUR-DIMENSIONAL ELECTRIC METHOD IN DETECTION OF COAL WATERPROOF GROUTING

In western boundary of a coal mine in middle Shandong area, agrouting reinforcement works is done to prevent hidden trouble caused by water.To detect the effect of grouting, and ensure the safe production of coal, we use the transient electromagnetic method to identify the location, scope, depth, and aquifer characteristics of the goaf, and compare with the morphological changes of the apparent resistivity contour.We evaluate all the grouting drilling applying four-dimensional electrical technique and provide basic geophysical technique for mine grouting quality.