A detection method for the effective diffusion radius of grout filling grout for isolation grouting overburden
A technology of diffusion radius and isolation grouting, which can be used in filling, measurement, earthwork drilling, etc., can solve problems such as unpublished detection methods, and achieve the effect of protecting safety and improving effectiveness
Active Publication Date: 2017-01-11
CHINA UNIV OF MINING & TECH
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[0003] Patent No. ZL201210164930.1 discloses a double-hole staggered-layer drilling arrangement method for isolation and grouting filling of mining overlying rock, specifically related to the determination of the distance between adjacent drilling holes above the coal mining face; Hole spacing, the patent ZL201210164930.1 sets the diffusion radius of the slurry in the mining area to be 100-200m, but does not disclose the detection method of the effective diffusion radius of the slurry in the mining area under different formation conditions
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Embodiment 1
[0028] Embodiment 1, take a certain working face as an example:
[0029] 1. Arrange ground grouting drilling.
[0030] a. Construct grouting drilling 1 in the direction of the coal seam on the ground surface 4 60m away from the cutting hole in the middle of the coal mining face 5. There is only one drilling hole in the group, and the depth of the final hole is located at a position 40 times the mining height above the coal seam, that is 120m.
[0031] b. Set the distance between the second group of grouting holes and the grouting hole 1 as L1, and set the horizontal distance between the main grouting hole 3 and the auxiliary grouting hole 2 as L2;
[0032] c. Construct the auxiliary grouting borehole 2 in the direction of the coal seam at a distance of 100m from the grouting borehole 1 on the surface 4, and construct the main grouting borehole 3 at the horizontal distance between the surface 4 and the auxiliary grouting borehole 2 at a distance of 50m. The depth is 30m below...
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The invention discloses a method for detecting active diffusion radius of a covered rock separation grouting filling slurry. A first group of grouting holes and a second group of grouting holes having the distance of L1 away from the first group of grouting holes are formed in the ground surface above a coal face vertically and downwards; the distance between a main grouting hole and an auxiliary grouting hole is L2; after the covered rock is filled by grouting via the grouting holes, whether the slurry flows out of the orifice valves of the auxiliary and main grouting holes of the second group of grouting holes is observed, and the active diffusion radius of a mining region is determined according to the slurry outflow condition. The holes for detecting the active diffusion radius of the slurry are all the grouting holes; the control effect on the subsequent grouting filling of the holes and surface subsidence is not affected and the problem of failure in detecting the active diffusion radius of the mining region by use of the grouting holes in traditional grouting filling projects is solved.
Description
technical field [0001] The invention relates to a method for detecting the effective diffusion radius of mining slurry for overburden grouting filling mining in coal mines, in particular to a method for detecting the effective diffusion radius of slurry suitable for mining overlying rock isolation grouting filling mining for pressing coal under buildings. Background technique [0002] With the continuous development of economy and society, the cost of traditional village relocation coal mining is getting higher and higher and the implementation difficulty is getting more and more difficult. Therefore, coal mining without relocation of villages has become an urgent demand of coal enterprises, especially for high recovery rate and low cost. A technology with low energy consumption and little interference with coal mining. Overlying rock grouting filling technology has these technical advantages. For example, patent ZL201210164929.9 discloses a coal mining method for mining ove...
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IPC IPC(8): E21F15/00E21B47/04E21B49/00
CPCE21B47/04E21B49/008E21F15/08
Inventor 轩大洋许家林王秉龙滕浩
Owner CHINA UNIV OF MINING & TECH