Treatment method for the deformation source of the segmental fracturing roadway with comb-shaped long drilling holes on the hard roof

Abstract

The invention discloses a method for controlling the deformation source of a sectioned fracturing roadway with a comb-shaped long drill hole on a hard roof, comprising the following steps: S1: selecting the plane position of the fracturing drilling hole and the position of the fracturing drilling section; S2: selecting the main hole Construction; S3: Fracturing of the first stage of the main hole; S4: Drilling construction of the first branch hole; S5: Fracturing construction of the first branch hole; S6: Fracturing of the second stage of the main hole; S7: Drilling and fracturing of the second branch hole S8: Carry out construction according to S6 and S7, until the fracturing construction is completed at all design positions of the main hole and the drilling construction and fracturing construction are completed at all branch construction positions. The present invention realizes the precise control of the hard rock layer and branch drilling, performs multi-point fracturing of the main hole section and the branch, and effectively weakens the hard roof layer ahead of time, thereby avoiding the sudden collapse of the roof caused by a large-area suspended roof. The coupling of strong dynamic load and ground stress caused by the large-scale deformation disaster of the roadway surrounding rock.

Description

Technical field

[0001] The present invention relates to the field of safety technology under the coal mine, and in particular to a deformation of a hard top plate comb-long-drilling segmental fracturing roadway deformation source governance method. Background technique

[0002] China's coal seam has a very complex, and the hard top plate of coal seam is generally developed, accounting for 1 / 3 of the national coal seam, and is distributed in a mining area of ​​more than 1 / 2. The top plate is hopped in the process of retreat, and it is difficult to naturally sputum. When the hop is reached a certain area, suddenly, the area is large, the support pressure and top pressure are constantly increasing, and accompanied Strong cycle compression, etc., causing the working surface bracket to die, equipment damage, is driven to affect the drum of the roadway, the helper drum is serious, the original support is invalid, and even hazard the malignant accident of personal safety. Among them, th...

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