Even-grouting structure of coal mine tunnel and construction technology thereof

Abstract

The invention discloses an even-grouting structure of a coal mine tunnel and a construction technology thereof. The even-grouting structure of the coal mine tunnel comprises a lane, wherein a concrete spraying layer is arranged on the inner wall of the lane, a grouting anchor rod for filling reinforcing slurry into surrounding rock so as to form a reinforcing assembly arch on the outer side of the lane is arranged in the surrounding rock of the lane, the inner end of the grouting anchor rod is communicated with a crack in the surrounding rock of the lane, the outer end of the grouting anchor rod protrudes out of the concrete spraying layer, grouting anchor cables are further arranged at the top of the lane and in the surrounding rock on two sides of the lane, one end of each grouting anchor cable is anchored in the surrounding rock, and the other end of the grouting anchor cable is anchored on the outer side of the concrete spraying layer. Slurry is filled in cracks in the surrounding rock of the lane for reinforcing, the grouting is performed according to the softness and broken degree and the crack development degree of the rock, and repeated reinforcing and cementing are performed, so that cohesion and inner friction angles of the surrounding rock can be fundamentally changed, the surrounding rock in a broken rock zone of the lane can be in a relatively homogeneous and stable state, and the reinforcing assembly arch even in stress is formed on the outer side of the lane.

Description

technical field [0001] The invention belongs to the technical field of geology and mining, and specifically relates to a coal mine roadway reinforcement technology, in particular to a method of reinforcing loose surrounding rock mass by injecting grouting material matching the surrounding rock mass into the surrounding rock mass on the outside of the roadway, so as to reduce loose and weak rock mass. The rock and coal mass is cemented into a whole, so that the reinforced surrounding rock loose rock mass forms a stress that tends to be evenly distributed, the properties of the surrounding rock tend to be homogeneous, and the structure of the surrounding rock tends to be stable as a whole. The surrounding rock outside the roadway forms a reinforcement combination. Uniform grouting structure and construction technology of arched coal mine roadway. Background technique [0002] With the continuous development of society and the continuous improvement of social energy demand, coa...

AI Technical Summary

Problems solved by technology

In the past, masonry, metal brackets, anchor rods, and anchor cables were generally used to solve the roadway support problem, but because these support methods are all surface support, they cannot fundamentally solve the texture of the surrounding rock loose circle of the roadway and the surrounding rock. The state of stress causes the support structure to be unstable, the service life is short, and there are great safety hazards, which directly affect the normal coal mine production

And most of the roadways are affected by the above, making it more difficult to repair

At present, grouting is also used for the reinforcement of the roadway surrounding rock, but the existing grouting method is to inject grout around the surrounding rock of the roadway. The pertinence of grouting is very poor, and it cannot be selected according to the stress of the roadway surrounding rock After grouting, the force on the surrounding rock outside the roadway is still uneven, and the force on the surrounding rock cannot be stabilized, resulting in poor reinforcement effect, short service life, short maintenance cycle, and huge cost

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