Gob-side entry retaining roof cutting method

Abstract

The invention discloses a gob-side entry retaining roof cutting method. The gob-side entry retaining roof cutting method comprises the following steps that S1, the thickness of a direct roof and basicroof of a roadway is calculated according to mine geological data, a drilling track is designed, and a directional drilling machine is used for conducting directional drilling operation according tothe drilling track; S2, one end of a saw line is connected with a drill pipe end head by using a connector at one end of a drilling hole after the drilling hole is opened, and when the drill pipe is pulled out, the drill pipe drives the saw line to penetrate through the drilling hole to complete saw line layout; and S3, assembly of a wire saw machine is completed, the saw line is arranged on the wire saw machine, the wire saw machine drives the saw line to carry out cutting operation to the direct top and the basic top, and after the saw line penetrates through the direct top and the basic top, gob-side entry retaining roof cutting is completed. According to the gob-side entry retaining roof cutting method, the wire saw machine is used for carrying out static cutting operation, thus the stability and safety of an existing structure can be saved to the greatest extent, power of the wire saw machine is high, the cutting ability and the cutting efficiency are improved, at the same time, the labor intensity of the staff is reduced, and convenience is brought to construction operation of the staff.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to a roof cutting method for gob-side entry retention. Background technique [0002] Gob-side retaining technology is the key technology to achieve high-yield and efficient production in thin coal seam mines. The stress conduction on the old roof of the roadway reduces the stress on the surrounding rock of the roadway, protects the integrity of the roadway, and achieves the purpose of retaining the roadway along the gob. The side roof collapse of the goaf is carried out by blasting. Since the blasting is impacted from the center to the surroundings, even if the weak surface of the blasting is drilled, it is still impossible to completely cut off the connection between the roadway and the old roof of the gob according to the expected blasting plane. Cause the pre-split surface to be uneven, which will affect the effect of gob-side entry retention (such as figure 1 , figure 2 shown); th...

AI Technical Summary

Problems solved by technology

The side roof collapse of the goaf is carried out by blasting. Since the blasting is impacted from the center to the surroundings, even if the weak surface of the blasting is drilled, it is still impossible to completely cut off the connection between the roadway and the old roof of the gob according to the expected blasting plane. Cause the pre-split surface to be uneven, which will affect the effect of gob-side entry retention (such as figure 1 , figure 2 shown); the shock wave generated by blasting is highly destructive and will seriously damage the roadway support quality, requiring secondary reinforcement of the roof support, which greatly increases the cost of manpower and financial resources for retaining the roadway; and the blasting cuts the roof without roadside support along the gob Gob retention cannot be applied to high-gas mines. If roadside support is used to retain roadways along gobs, the cost of roadway retention will be greatly increased. Therefore, a method to reduce the cost of roadway retention and improve the effect of roof cutting is needed to solve the above problems

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