Method for reconstructing top plate and bottom plate double limestone water-bearing strata through double-layer multiple branch consequent layer drilling grouting

Abstract

The invention belongs to the field of mine water prevention and control and particularly relates to a reconstruction method for a seam which is threatened by double limestone water damage of a top plate and a bottom plate. Compared with original technologies of top and bottom plate reinforced grouting, downhole reinforced grouting and ground horizontal drilling treating coal seam bottom plate thin layer limestone by using ground vertical boreholes, according to the technology of the invention, advanced type high pressure grouting is conducted on a target layer by using a petroleum drilling machine to construct double-layer multiple branch consequent layer drilling, so that a coal seam top plate and bottom plate limestone water-bearing strata is reconstructed, and safe coal seam exploitation is realized. By means of the mode, the effects that the range of covering the target layer is wide, the hole drilling engineering amount is small, top plate and bottom plate holes share the same opening section, the cost of top plate water drainage is low, work of bottom plate reinforcement and reconstructing and water prevention and control conducts in advance are realized, and finally, the top plate is reconstructed into a weak water-bearing rock strata or a water-free rock strata and the bottom plate is reconstructed into a water-resisting strata. The technology can also be applied to mines, such as iron mines or nonmetal mines, which are threatened by double water damage of the top plate and the bottom plate, so that safe and economic resource exploitation is realized.

Description

technical field [0001] The invention belongs to the field of mine water prevention and control, and in particular relates to a mine layer reconstruction method threatened by double limestone water damage on the roof and the bottom plate. Background technique [0002] In some mining areas of the North China type coalfield, there is a relatively stable Xujiazhuang thin-bedded limestone aquifer in the Benxi Group, and the distance between Austrian ash and Xu ash in some mining areas is small (for example, 10-16m in the Feicheng mining area, about 15m in the Jingxing mining area, and 7 m in the North Yellow River coalfield. -10m) or there are thinning zones, structural fracture zones, and water-conducting fissure zones, so that the hydraulic relationship between the two is close, and they are actually a water-bearing body macroscopically. [0003] At present, the domestic floor limestone confined water treatment technology is more mature. The surface grouting station is used t...

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Problems solved by technology

[0003] At present, the domestic floor limestone confined water treatment technology is more mature. The surface grouting station is used to pre-grout the floor limestone through the grouting pipeline and the grouting hole in the underground working face, and to fill the karst cracks and conduits of the floor limestone aquifer. Water fissures replace the water in the thin limestone and cut off the water supply channel, so that the injected aquifer is transformed into a weak or non-aqueous layer, and the mining of the working face without water inrush has achieved good results, such as Feicheng, Shandong, Yongcheng, Jiaozuo, Henan and other mining areas, but the disadvantage of this method is that the underground space is limited, the drilling distance is short, the construction volume is large, the cost per ton of coal is high, and the safety factor is relatively low

[0004] The technology of horizontal drilling on the ground to control the thin la...

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