Hard roof comb shaped long borehole staged fracturing roadway deformation source treatment method

Abstract

The invention discloses a hard roof comb shaped long borehole staged fracturing roadway deformation source treatment method. The hard roof comb shaped long borehole staged fracturing roadway deformation source treatment method comprises the following steps of S1, selection of the plane position of a fracturing borehole and the section position of the fracturing borehole; S2, construction of a mainborehole; S3, fracturing of a first section of the main borehole; S4, drilling of a first branch borehole; S5, fracturing construction of the first branch hole; S6, fracturing of a second section ofthe main hole; S7, drilling and fracturing construction of a second branch hole; and S8, construction in accordance with S6 and S7 until fracturing construction is completed at all design positions ofthe main hole and drilling and fracturing construction is completed at all branch construction positions. The hard roof comb shaped long borehole staged fracturing roadway deformation source treatment method realizes the precise control of the layer and branch drilling of the hard rock layer, carries out multi-point and section by section fracturing of the main hole section and branch, effectively weakens the layer position of the hard top plate ahead, so as to avoid the large-scale deformation of surrounding rock caused by the coupling of strong dynamic load and crustal stress caused by thesudden collapse of the roof due to a large area of suspended roof.

Description

technical field

[0001] The invention relates to the technical field of underground safety in coal mines, in particular to a method for controlling the deformation source of a hard roof comb-shaped long borehole segmented fracturing roadway deformation. Background technique

[0002] The occurrence conditions of coal seams in China are very complicated, and the hard roofs of coal seams are generally developed, accounting for 1 / 3 of the national coal seams, and distributed in more than 1 / 2 of the mining areas. During the recovery process of this type of roof, a large area of ​​the roof is suspended and it is difficult to fall naturally. When the suspended roof reaches a certain area, it suddenly falls, and the area of ​​the first collapse is large, and the bearing pressure and roof pressure are also increasing continuously. Strong periodic pressure and other dynamic phenomena occur, resulting in the crushing of the support of the working face, equipment damage, serious deformat...

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