Synchronous grouting slurry for shield construction of water-rich stratum and preparation method thereof

Abstract

The invention relates to synchronous grouting slurry for shield construction of a water-rich stratum and a preparation method thereof. The synchronous grouting slurry comprises a component A, a component B and a component C, wherein the raw materials of the component A comprise silicate 42.5-grade cement, II-grade fly ash, river sand and sodium bentonite, the raw materials of the component B comprise hydroxyethyl methyl cellulose and tap water, the raw material of the component C comprises nano silicon dioxide, the tap water, the ratio of the blending amount of the component B to the blending amount of the component A is 3: 5, and the ratio of the blending amount of the component C to the blending amount of the component A is 1: 2; the synchronous grouting slurry is high in early-stage shear strength, good in groutability, stable, high in stone rate, low in bleeding rate and good in dilution resistance, certain shear resistance is provided after the synchronous grouting slurry is injected, then duct pieces are inhibited from floating upwards, the effect of stabilizing the duct pieces can be achieved, and the problems of cracking and water seepage of the duct pieces are solved.

Description

technical field [0001] The invention belongs to the technical field of shield tunnel construction, and in particular relates to a synchronous grouting slurry for shield tunnel construction in water-rich strata and a preparation method thereof. Background technique [0002] With the rapid development of tunnel engineering, the application of shield tunneling method construction technology is becoming more and more extensive, and synchronous grouting is an important process of shield tunneling method construction. Synchronous grouting materials are mainly divided into inert grout and active grout. Among them, single-liquid active grout is often used in mud-water shield construction. However, during the excavation of mud-water shield tunnels across the river, high permeability, high water pressure or In the water-rich stratum with cracked and fractured zones, in the water-rich stratum environment, ordinary single-liquid active grouting materials have weak water dispersion resis...

AI Technical Summary

Problems solved by technology

At present, the admixture materials commonly used to improve the dispersion resistance of slurry under water are various types of cellulose, but cellulose is not conducive to the coagulation of slurry and the development of early strength, while nano-silica has the ability to fill the pores of slurry materials and promote Excellent physical and chemical properties such as cement hydration, improving compressive strength, impermeability and durability

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