A single liquid stabilized cement-based grout for reinforcement of the surrounding rock of a thousand-meter-deep horizontal roadway

Abstract

The invention discloses single-liquid-stabilized cement-based slurry for a surrounding rock consolidation of 1000-meter-depth horizontal roadway. The slurry comprises the following components in parts by weight: 80-100 parts of a gel material, 60-150 parts of water and 1-15 parts of a compound admixture, wherein the compound admixture comprises 0-100 parts of an inorganic stabilizer, 0-100 parts of an organic stabilizer, 0-100 parts of a structure reinforcing agent and 0-100 parts of a compound retarder. Due to physical and chemical actions of the compound admixture, the slurry has the excellent characteristics of low viscosity, good liquidity, high stability, long coagulation time and controllability; a slurry consolidated body has the characteristics of low early strength and high long-term strength, normal tensile bonding strength and shear strength.

Description

technical field [0001] The invention relates to a cement slurry used in the field of roadway surrounding rock reinforcement in coal mine construction, in particular to a stable cement-based slurry suitable for the technical field of ground pre-grouting for strengthening the surrounding rock of a thousand-meter-deep horizontal roadway. Background technique [0002] The ground pre-grouting technology for strengthening the surrounding rock of the horizontal roadway in a thousand-meter deep well refers to the use of high-precision drilling trajectory control technology to carry out ground pre-grouting reinforcement on the unstable and broken surrounding rock of the underground horizontal roadway through horizontal drilling. [0003] The currently used surrounding rock grouting reinforcement materials include chemical grout and cement grout. [0004] Chemical slurries mainly include acrylamide and polyurethane, which have the advantages of good permeability, adjustable gel time, ...

AI Technical Summary

Problems solved by technology

Although the single-liquid cement slurry has the advantages of wide source of materials, low price, high stone body strength, and simple construction technology; but the water-cement ratio is low and the suspension stability is poor (when the water-cement ratio is 1:1, the 2h water separation rate is about 25% ), poor injectability, only small pump volume, small section high grouting process can be used in the grouting process, and the water separation of the grout not only leads to the failure of the reinforcement effect but also easily causes accidents such as embedding and difficulty in unplugging

Although the cement-water glass double liquid slurry has a high stone formation rate, short setting time and adjustable setting time, the stone body strength is low, the durability is poor, and the construction technology requirements are also high.