Tunnel surrounding rock control technology combining pressure relief and slip-casting reinforcement

Abstract

The invention discloses a tunnel surrounding rock control technology combining pressure relief and slip-casting reinforcement. The control technology comprises following steps of determining basic parameters of positions, numbers, diameters and depths of pressure relief drilling holes according to deformation conditions of surrounding rocks in an anchor supporting big deformation anchoring tunnel; using a drilling machine to performing hole drilling in an assigned position until reaching an elastic area; arranging a slip-casting steel pipe system formed by a front blocking ring, a connection hoop, a back blocking ring and a slip-casting steel pipe in the pressure relief drilling holes; using a measuring and detecting device to perform continuous observation for deformation rate of the diameters of the pressure relief drilling holes so as to determine slip-casting materials, ratio of slurry, slip-casting pressure and slip-casting time; stopping observation when the deformation rate of the diameters of the pressure relief drilling holes increases suddenly; fastening the slip-casting steel pipe and connecting the outer end part of the slip-casting steel pipe with a slip-casting pump via a slip-casting soft pipe and a hole-containing sealing plug; starting the slip-casting pump so as to allow the slurry to enter a spare hole filling area and be pressed into cracks of the surrounding rocks; and after the slip casting is finished, rotating fastening screws so as to carry out secondary fastening, thereby finishing the whole construction process.

Description

technical field [0001] The invention relates to a large-deformation roadway surrounding rock control technology, which belongs to the field of geotechnical engineering anchoring support, and in particular relates to the roadway surrounding rock control technology of underground mining engineering roadway surrounding rock decompression stress release and grouting strengthening bearing. Background technique [0002] After the roadway is excavated in the coal-rock mass, due to the breaking of the original rock stress, a stress concentration area will be formed around the roadway. If the bearing capacity of the shallow surrounding rock is less than the redistributed stress, the surrounding rock of the roadway will be unstable. Most of the methods used are to anchor and support the surrounding rock of the roadway, so that the strength of the shallow surrounding rock can be strengthened under the pre-tightening force of the bolt, but it will also cause the surrounding rock of the r...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the lack of synergy between the stress reduction zone formed around the roadway and the grouting strengthening of the surrounding rock in the existing roadway drilling pressure relief, and proposes a roadway surrounding rock control technology in which the drilling pressure relief and grouting strengthening are coordinated. It aims to solve the problem of grouting strengthening and re-bearing of the broken surrounding rock after the pressure relief of the roadway drilling, realize the synergy between the stress transfer of the surrounding rock of the roadway and the strengthening of the bearing, so as to reduce the construction steps, reduce the support cost, and achieve the purpose of stabilizing the surrounding rock of the roadway

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