A method for classifying the hazard degree of phreatic leakage in shallow-buried coal seam mining
A leakage and coal seam technology, applied in surface mining, mining equipment, underground mining, etc., can solve the problem of inability to accurately judge the leakage degree and disaster-causing situation of the overlying aquifer in the coal mining area, and the low degree of ecological environment damage, so as to achieve classification Simple and practical effect
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[0063] The technical solutions of the present invention will be described in detail below in conjunction with specific examples.
[0064] Such as Figure 5 Shown is the coal mining face of Jinjitan Coal Mine. The Jinjitan Coal Mine’s coal mining face is 5300m long and 300m wide. The working face was mined in June 2016. The average speed of the mining is about 10m / d. The monitoring point is located in the center of the working face. After completion, automatic water level monitoring is carried out. The water level gauge probe is located 15m below the initial water level to ensure that water level changes can be monitored at all times during the mining process. At this time, the distance between the footage and the monitoring point is -265m (negative values indicate that the monitoring point has not been mined, and positive values indicate that the mining has been completed) monitoring point), and the water level Hw record of the water level gauge is shown in Table 1.
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