Abstract
As coal seam of Golden Concord coal mine occurs in cretaceous, outcrop mining area is threatened by tertiary gravel aquifer. This paper determines the water abundance of outcrop area through pumping test, analyses the physical mechanical properties and composition of cretaceous strata, and also researches the damage characteristics of cretaceous rock by field measurement and similar simulation experiment. The final conclusion includes: 1) the water abundance of tertiary gravel aquifer is weak; 2) the cretaceous rock strata belongs to weak type; 3) the ratio of caving zone and mining height, and the ratio of fracture zone and mining height are very close through field measurement and similar simulation experiment, and using the measured data to predict the 'two zones' height; 4) using different mining methods in different outcrop areas. This research could liberate amount of coal in the outcrop area, and guarantee the continuous safety production of the coal mine.
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