Detection method of radon gas in the floor damage depth of the upper coal seam in close-distance coal seam mining

Abstract

Provided is a method for detecting upper coal seam floor damage depth radon gas in close-distance coal seam mining. According to the distance between an upper coal seam and a lower coal seam, a needed rectangular detection area is determined by combining the inclination length of the work face of the upper coal seam; in the process of mining the upper coal seam, measurement lines are arranged in the determined rectangular detection area along diagonal lines in advance, and then measurement points are arranged on the measurement lines respectively; drill holes are vertically punched in the rock stratum of the upper coal seam at the measurement points respectively, air exhaust rods of radon detectors are sealed in the drill holes, and the air exhaust rods are connected to the radon detectors through rubber hoses; the radon detectors are turned on and start to carry out measurement, each measurement point is measured for 3 hours, measurement results are transmitted to a notebook computer to draw a radon gas concentration changing curve, specific geological conditions are combined, the evolutionary characters of mining-induced fractures of the floor rock of the upper coal seam are analyzed, and the upper coal seam floor damage depth can be obtained through inversion. The method is strong in operability, data are easy to obtain, efficiency is high, and wide practicality and generalization performance are achieved.

Description

technical field [0001] The invention relates to a method for detecting the damage depth of a coal seam floor, belonging to the technical field of coal mine underground mining, in particular to a method for detecting radon gas of an upper coal seam floor damage depth in short-distance coal seam mining where the coal seam spacing h is between 5.0 and 10.0 m. Background technique [0002] In recent years, the mining of close-distance coal seams has gradually attracted great attention from the mining industry in my country. Coal seam (group) mining problems, such as Baoji, Datong, Datun, Gujiao, Handan, Huaibei, Huainan, Huozhou, Jinglong, Kailuan, Pingdingshan, Shuangyashan, Shuicheng, Xishan, Xinwen and other mining areas; second, After years of large-scale and high-intensity mining, the reserves of coal seams with better conditions in most mining areas have become less and less, resulting in the depletion of resources and tension in production in many mines, so many mines have ...

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Problems solved by technology

In terms of theoretical calculation, because the relevant specific geological conditions will be simplified during the calculation process, the difference between the final calculation result and the actual situation on the spot will increase; It reflects the actual phenomenon on site; in terms of field measurement, the existing detection methods have shortcomings such as being easily restricted by mining conditions, which makes it impossible to judge whether the detection results are accurate and effective, which seriously affects the safe and efficient mining of close-distance coal seams

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