Supporting method and device for ejection problem of anchor rod and anchor cable cover plate

Abstract

The invention discloses a supporting method and device for an ejection problem of an anchor rod and an anchor cable cover plate. According to different surrounding rock conditions, grouting key parameters are scientifically selected, grouting equipment is used for quickly grouting the interior of a grouting anchor rod, slurry is diffused into gaps of a rock body through the grouting anchor rod, grouting is carried out in a surrounding rock body of a roadway, so that the slurry is diffused, compacted and condensed in the gaps in the rock body, loose and broken surrounding rock in the range is cemented into a whole; the slurry with pressure is reserved in the surrounding rock body of the roadway, so that the initial supporting resistance of the surrounding rock is improved, and a slurry cementing reinforcing arch is formed; the shallow surface part of the surrounding rock is constructed into a ring body with the surrounding rock with certain internal stress, so that the multi-layer anchor rod and the multi-layer spraying layer are connected more firmly; a plurality of protection rings are formed in the surrounding rock, and meanwhile, the grouting anchor rod and the rock body are quickly cemented into a whole, so that the stress difference of the surrounding rock at the deep part and the shallow part is reduced, and then the dangerous situation that the anchor rod and the anchor cable are ejected is prevented.

Description

technical field [0001] The invention relates to the field of roadway support, in particular to a support method and the field of support equipment for the ejection of anchor rods and cable covers. Background technique [0002] As we all know, in the initial stage of roadway excavation, due to the change of the stress field of the surrounding rock, the principal stress difference of the roadway shows a slow, rapid and rapid growth trend from the shallow part to the deep part. In the shallow part of the surrounding rock, the principal stress difference is the smallest. Compared with the high stress of the deep surrounding rock, it is almost in an infinitely small state, and the strength of the surrounding rock is extremely low, and it is the most vulnerable to damage; while toward the deep direction of the surrounding rock, the stress difference becomes smaller and smaller compared with the deep surrounding rock, and the surrounding rock The rock strength and internal stress a...

AI Technical Summary

Problems solved by technology

[0002] As we all know, in the initial stage of roadway excavation, due to the change of the stress field of the surrounding rock, the principal stress difference of the roadway shows a slow, rapid and rapid growth trend from the shallow part to the deep part. In the shallow part of the surrounding rock, the principal stress difference is the smallest. Compared with the high stress of the deep surrounding rock, it is almost in an infinitely small state, and the strength of the surrounding rock is extremely low, and it is the most vulnerable to damage; while toward the deep direction of the surrounding rock, the stress difference becomes smaller and smaller compared with the deep surrounding rock, and the surrounding rock The rock strength and internal stress are getting higher and higher, so the deep surrounding rock is most likely to be stable. For the roadway support under the rock burst environment, we can not only resist the high stress of the deep surrounding rock from the strength of the supporting material, but also The fundamental solution is to improve the mechanical properties of the surrounding rock and reduce the stress difference in the deep and shallow surrounding rock. This is the fundamental way to solve the high stress roadway in the deep well, and the stress difference in the deep and shallow surrounding rock will lead to the ejection of the anchor rod and the anchor cable. Dangerous situation, which in turn leads to the loss of support of the roadway and collapse. In the existing technology, this problem cannot be solved. Therefore, it is necessary for us to propose a support method and support equipment for the ejection problem of the anchor bolt and cable cover.

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