A multi-support collaborative method for controlling broken surrounding rock in coal mines

Abstract

The invention discloses a multi-support cooperation method for controlling broken surrounding rock of a coal mine. In the support time, firstly, the surrounding rock is supported by a retractable canopy frame, then the broken surrounding rock part is subjected to grouting cementing, and finally, the broken surrounding rock and original complete surrounding rock are anchored and cemented through extensible anchor rods; in the support space, the retractable canopy frame supports and limits initial deformation of the surface of the surrounding rock, meanwhile, the surface of the surrounding rockis protected by a leakage-preventing flexible layer, leakage of grouting slurry is prevented, the broken surrounding rock at the shallow part is subjected to grouting cementing, then the extensible anchor rods are adopted to go deep to enable the cemented broken surrounding rock at the shallow part and the original complete surrounding rock to be connected in an anchored mode; and in the support strength, the retractable canopy frame supports the gravity of the surrounding rock at the broken part, so that the breaking range is not quickly expanded, the overall structure of the cemented surrounding rock can be formed after grouting cementing of the broken surrounding rock, the gravity can be borne by the strength, the anchoring strength of the extensible anchor rods is determined accordingto the deformation rate of the surrounding rock, and the purpose of multi-support cooperative control over stable-state deformation of the surrounding rock is achieved.

Description

technical field [0001] The invention relates to a supporting method for broken surrounding rocks in coal mines, in particular to a multi-supporting collaborative method for controlling broken surrounding rocks in coal mines. Background technique [0002] Deep mining is an important issue facing the utilization of coal resources in my country. Under the condition of deep high stress, the surrounding rock of the roadway is rapidly broken after excavation and unloading. Under the influence of the mining disturbance of the working face, the broken area of ​​the surrounding rock of the roadway continues to expand, forming a large-scale broken area. If effective control measures are not taken, it is very easy to cause large deformation, instability and damage to the deep roadway. The current engineering practice shows that the existing support theory and technology can no longer be applied to the control of large-scale broken surrounding rock in deep roadways. protection): It ha...

AI Technical Summary

Problems solved by technology

If effective control measures are not taken, it is very easy to cause large deformation, instability and damage in deep roadways

The current engineering practice shows that the existing support theory and technology can no longer be applied to the control of large-scale broken surrounding rock in deep roadways. protection): It has problems such as insufficient support strength, too small support range, and insufficient coordinated deformation capacity of the support structure.

Due to the above problems, a large number of anchor rods and anchor cables are broken or the phenomenon of anchor rods and anchor cables falling together with the broken surrounding rock

In addition, the elongation rate of existing active support structures such as anchor rods and anchor cables is generally difficult to adapt to the deformation of large-scale broken surrounding rock in deep areas.

In terms of passive support theory and structure (that is, scaffolding is used for support): through field investigations and theoretical calculations, it is found that both rigid scaffolding and retractable scaffolding are difficult to compete with the huge ground stress. , so that the deformation of the deep broken surrounding rock is large, and the deformation is uneven, which eventually causes the scaffolding to break, twist and break

On the whole, the main problem existing in the existing support theory is that it cannot fully mobilize the self-bearing capacity of the deep and shallow surrounding rocks of the roadway, and cannot form a support-surrounding rock cooperative bearing structure, so that it is impossible to achieve high-stress crushing of the surrounding rock. secondary stability

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