Drainage and slow seepage grouting control technology under water-rich and broken condition of roadway roof

Abstract

The invention discloses a drainage slow seepage slurry injecting control technology under the roadway top plate water-rich and fragmentation condition. A disaster-caused water source and a leading-water-containing channel are subjected to comprehensive probing to determine a slurry injecting treatment target section spatial position; deep leading drainage decompression is conducted, specifically, hole drilling is conducted on an upstream water-rich area of the leading-water channel, high-pressure gushing water gushing towards deep broken surrounding rocks is led out in advance, and the influence of the gushing water on the broken surrounding rocks is reduced; top plate shallow broken surrounding rock low-pressure slow seepage slurry injecting strengthening is conducted, specifically, low-pressure slow seepage slurry injecting is conducted on a top plate broken area through a hollow slurry injecting anchor rod, filling is conducted on hollow holes or cracks in the broken surrounding rocks, and the purposes for blocking the gushing water and improving overall strength of the surrounding rocks are achieved; drainage decompression drilled hole blocking is conducted, specifically, after shallow surrounding rock slurry injecting is finished and surrounding rock deformation is stabilized, a drainage decompression drilled hole is finally blocked; and slurry injecting effect comprehensive examination is conducted, specifically, slurry injecting effect examination is conducted on a slurry injecting section through hole examination and geophysical means, the slurry injecting weak area spatial range is delineated, and injecting slurry is supplemented.

Description

technical field [0001] The invention belongs to the field of mine and underground engineering disaster management, in particular to a drainage and slow seepage grouting control technology under the condition of water-rich and broken roof of coal mine roadway. Background technique [0002] With the depletion of shallow resources, my country's coal mining has gradually shifted to the deep, and the depth and intensity of coal mining have continued to increase, resulting in increasingly complex hydrogeological conditions, and unfavorable factors such as water pressure and ground stress have become more prominent. Especially when encountering special geology such as fault fracture zones, the problem of water damage caused by deep mining becomes more prominent. Water gushing is the main cause of failure and instability of roadway surrounding rock, especially when water gushing occurs in weak and loose and broken surrounding rock, it is more harmful. [0003] At present, shallow g...

AI Technical Summary

Problems solved by technology

Because the roof of the roadway excavation directly exposes the water-rich and broken rock mass, it is often difficult to directly use the grouting slab for water blocking due to the broken roof, and the disturbance of drilling and grouting pressure is likely to damage its stability, bulging or even collapse phenomenon

In addition, under the influence of high-pressure water inrush, construction drilling in shallow broken surrounding rock often encounters drilling accidents caused by hole wall collapse, and the injected slurry under the action of dynamic water is instantly washed away, diluted and carried away.

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