Rapid roadway driving method for hard roof directional hydraulic fracturing gob-side roadway

Abstract

The invention discloses a hard roof directional hydraulic fracturing gob-side roadway rapid driving method, and belongs to the field of rock stratum movement and roadway surrounding rock control. The method comprises the following steps: determining the position and thickness of a hard roof; formulating a directional horizontal drilling arrangement scheme and a hydraulic fracturing scheme in the hard roof; adopting a directional drilling machine to sequentially construct directional horizontal drill holes and performing hydraulic fracturing; and carrying out excavation operation on the gob-side roadway. Through the implementation of the method, the length of the hard suspended roof above the coal pillar can be reduced, the surrounding rock stress environment of the roadway is optimized, the surrounding rock control difficulty of the gob-side roadway is reduced, the roadway tunneling speed is increased, the roadway through time is shortened, and mining replacement tension is relieved. The number of drilled holes is small, the effective fracturing range is large, the construction period is short, and the roof cutting-off effect is good.

Description

technical field [0001] The invention relates to the fields of rock layer movement and roadway surrounding rock control, in particular to a fast roadway digging method for a gob-side roadway by directional hydraulic fracturing of a hard roof. Background technique [0002] Gob-side entry has been successfully applied in many mining areas. However, under the condition of a hard roof, the lateral suspension above the coal pillar is difficult to collapse naturally, and the rock strata at the edge of the gob will sink, break and turn when driving. Instability, large deformation of the surrounding rock of the roadway and strong dynamic load pressure appear, resulting in tension in mining replacement, high maintenance cost of the roadway and even casualties. [0003] In order to reduce the length of the hard overhang, reduce the difficulty of surrounding rock control, and shorten the rock stabilization time at the edge of the goaf, the technical measures currently used are mainly bl...

AI Technical Summary

Problems solved by technology

[0004] Roof cutting by blasting has the disadvantages of large consumption of explosives, high cost of treatment, difficulty in charging long-distance holes, and affecting the normal passage of roadways during operation; hydraulic fracturing of straight holes has the disadvantages of large number of drilled holes, large amount of engineering, frequent relocation of equipment, and cutting Disadvantages such as poor drop effect

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