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A kind of advance grouting support method for advance support small conduit and deep soft rock roadway

A technology of advanced support and small conduits, applied in tunnels, earthwork drilling, tunnel linings, etc., can solve problems such as brittle failure, achieve the effects of increased friction, improved support strength, and improved tensile strength

Active Publication Date: 2022-07-05
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, the surface of a small conduit is straight and smooth, and it is prone to brittle failure when subjected to a large formation shear force

Method used

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  • A kind of advance grouting support method for advance support small conduit and deep soft rock roadway
  • A kind of advance grouting support method for advance support small conduit and deep soft rock roadway
  • A kind of advance grouting support method for advance support small conduit and deep soft rock roadway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] refer to Figure 1-2 , this embodiment provides a small advanced support conduit, including a hollow conduit body, the end of which has a grouting port for grouting, the head end has a jacking portion, and along the length direction of the conduit body is provided with The overflow hole 4 communicated with its inner hollow part; at least one section of the duct body is a curved pipe body 1; the end of the duct body is coaxially provided with a blocking tray 8, and the blocking tray extends around its radial direction into a tray shape; The part and the conduit body are inserted into the roadway wall in turn, the slurry is injected into the conduit body through the grouting port 3 and overflows into the roadway wall from the overflow hole 4, and the blocking tray 8 is closely attached to the roadway wall to prevent the rock and soil slump of the roadway wall and the slurry Seepage out of the roadway wall, and the slurry solidifies in the roadway wall to form the support ...

Embodiment 2

[0052] see Figure 3-4 , the present embodiment provides a method for advanced grouting support for deep soft rock roadways, using the advanced support small conduit as described in Embodiment 1 for advanced grouting support before excavation of deep soft rock roadways , the method includes the following supporting construction steps:

[0053] S1: Determine the construction point with a high risk factor of easy collapse on the deep soft rock roadway to be excavated, and mark multiple control points on the radial section of the roadway where the construction point is located;

[0054] S2: Drill a hole at the control point, and drive the small advanced support conduit into the roadway wall through the hole;

[0055] S3: prepare slurry, inject the slurry into the small advanced support conduit through the grouting port 3, and inject the slurry into the roadway wall through the slurry overflow hole 4;

[0056] S4: After grouting is completed, screw the locking part, lock the blo...

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Abstract

The invention discloses an advanced grouting support method for a small advanced support conduit and a deep soft rock roadway. The advanced support small conduit comprises a hollow conduit body, the end of which is provided with a grouting port for grouting. The end has a jacking portion, and along the length direction of the catheter body, there is a slurry overflow hole communicating with its inner hollow part; at least one section of the catheter body is a curved pipe body; the end of the catheter body is coaxially provided with a blocking tray, and the blocking tray is along The radial direction extends to the surrounding into a tray shape; the jacking part and the conduit body are inserted into the roadway wall in turn, the slurry is injected into the conduit body through the grouting port and overflows into the roadway wall from the overflow hole, and the slurry solidifies in the roadway wall to form a roadway Support before excavation. Due to its special structure, the super-strong supporting small conduit provided by the invention greatly reduces the shear force of the stratum and enhances the bearing capacity, thereby effectively improving its service life and greatly improving the supporting bearing capacity of the surrounding rock of the roadway.

Description

technical field [0001] The invention belongs to the technical field of deep soft rock roadway construction, and particularly relates to an advanced grouting support method for a small conduit for advanced support and a deep soft rock roadway. Background technique [0002] With the further mining of coal in my country, the coal resources in opencast coal mines and shallow formations are becoming less and less, and coal mines are indispensable as the main energy source of our country, so that the coal mining work is transferred to the deep area, and the mining depth is increased from 0m-300m to 500m-600m or even more than 1000m. However, with the increasing depth of coal mining, it also brings a series of problems, the most prominent of which is the safety of deep soft rock roadways. Due to the deep burial depth of the roadway and the complex geological conditions in which the roadway is located, the in-situ stress in the mining area is increasing, the roadway is seriously def...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10
CPCE21D11/105
Inventor 仇圣华张帅姜风周成
Owner SHANGHAI INST OF TECH