A method of layered paste filling the coal pillar of the stop production line in the residual mining area of the re-mined extra-thick coal seam
A technology of extra-thick coal seam and paste filling, which is applied in the direction of filling, ground mining, mining equipment, etc., can solve the problems of affecting the safe production of coal pillars and increasing the tendency of spontaneous combustion, so as to reduce the tunneling rate, reduce waste, prevent Effects of security incidents
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Embodiment 1
[0041] Such as figure 1 As shown, the average thickness of the coal seam in a certain mine is 8.35m, and the average inclination angle of the coal seam is 3°. According to the thickness of the coal seam, the coal pillar of the extra-thick coal seam shutdown line is divided into two layers, which are respectively recorded as Ⅰ, Ⅱ, and No. Ⅰ layered coal seam from bottom to top The thickness is 4.5m, and the thickness of No. Ⅱ layered coal seam is 3.85m.
[0042] Figure 2~Figure 4 yes figure 1 The cross-sectional diagram in the figure further illustrates the layout of the re-mining roadway.
[0043] The volume of accumulated water and the amount of gas accumulated in the goaf 10 of the original working face were detected. In order to prevent water inrush accidents in the mining roadway, the goaf of the original working face should be drained; in order to prevent gas outburst and coal seam spontaneous combustion, nitrogen and flame retardant should be injected into the goaf o...
Embodiment 2
[0051] Such as Figure 5 As shown, the average thickness of a coal seam in a certain mine is 13.76m, and the average inclination angle of the coal seam is 3°. According to the degree of the coal seam, the coal pillar of the extra-thick coal seam shutdown line is divided into 3 layers, which are respectively recorded as Ⅰ, Ⅱ, Ⅲ, and Ⅰ from bottom to top. The thickness of the seam coal seam is 5m, the thickness of the No. 2 seam is 5m, and the thickness of the No. 3 seam is 3.76m. The layered roadway is arranged in an internal staggered manner as a whole, the internal stagger distance between No. 3 layer and No. 1 layer is about 8-10m, and the internal stagger distance between No. 2 layer and No. 1 layer is about 3-5m. The order of recovery is layered recovery from top to bottom, and other steps are the same as in the previous embodiment.
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