High-low pressure integrated roadway grouting reinforcement method

Abstract

A high-low pressure integrated roadway grouting reinforcement method is applicable to coal mine roadway support projects. Aiming at deformation and fracture of surrounding rocks of a roadway and fracture distribution rules, injected holes of the surrounding rocks of the roadway are subjected to grouting in sequence by means of low-pressure grouting and high-pressure grouting. The method includes: drilling a rock mass to a designed depth, installing a grouting pipe, and sealing holes with cement; subjecting the roadway surface to guniting to form a surface guniting layer; connecting pipelines, starting a grouting pump, subjecting the superficial rock mass to low-pressure grouting, increasing the grouting pressure after the diffusion range meets design requirements, and opening an expansion pipe under the action of high grouting pressure. The expansion pipe is expanded to stop grout flowing to the superficial surrounding rocks along the grouting holes, so that diffusion of the grout to the superficial rock mass is prevented. The deep rock mass is grouted by high-pressure grout through the grouting pipe to realize high-pressure grouting of the deep surrounding rocks.

Description

technical field [0001] The invention relates to a grouting reinforcement method, in particular to a high and low pressure integrated roadway grouting reinforcement method suitable for coal mine roadways and rock mass tunnels. technical background [0002] With the increasing demand for coal resources, many domestic mines have gradually entered the state of deep mining. After the mine enters deep mining, the surrounding rock of the roadway shows the characteristics of increased in-situ stress, intensified deformation and damage, difficult support, and repeated repairs. Deformation of surrounding rock, partial collapse of strata, water inrush at water points, etc., threaten the safety of personnel and equipment, and delay normal production. In site construction design, the grouting method is commonly used to block water and reinforce surrounding rock. The grouting technology can cement the loose and broken surrounding rocks into a whole, improve the strength of the rock mass...

AI Technical Summary

Problems solved by technology

[0004] (1) This grouting method requires two drilling constructions, and two sets of grouting pipelines matching the drilling specifications cannot be used in series with each other, which is labor-intensive and complicated;

[0005] (2) After the grouting of the shallow hole is completed, the grout in the shallow surrounding rock will seep out of the hole during the construction of the deep hole with the drilling rig, resulting in the loss of the grout in the shallow part and weakening the grouting effect;

[0006] (3) The grouting radius is small, and the deep rock mass cannot be fully grouted

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