Environment-friendly shield construction single-liquid synchronous grouting slurry

Abstract

The invention relates to materials applicable to underground engineering construction, in particular to environment-friendly shield construction single-liquid synchronous grouting slurry. The slurry comprises the following materials in percentage by weight: 55 to 70 percent of sand, 10 to 20 percent of desulphurization gypsum, 10 to 20 percent of fly ash and the balance of additive and water, wherein the additive is a water-soluble high-molecular polymer thickening agent and/or a high-performance polycarboxylic water reducing agent; the water-soluble high-molecular polymer thickening agent is 0.5 to 1.0 percent of the total weight of the desulphurization gypsum and the fly ash; and the high-performance polycarboxylic water reducing agent is 0.75 to 1.25 percent of the total weight of the desulphurization gypsum and the fly ash. Compared with the conventional single-liquid synchronous grouting, the grouting slurry has the advantages of substituting the lime powder with high energy consumption and high pollution for waste desulphurization gypsum, along with the same performance. The grouting slurry solves the problems of a large amount of land occupied by the desulphurization gypsum and serious environmental pollution, also avoids the use of the lime powder with high energy consumption and high pollution and fulfills the aims of energy conservation and environmental protection. Meanwhile, a new way is found for the application of the desulphurization gypsum.

Description

technical field [0001] The invention relates to materials used in underground engineering construction, in particular to an environment-friendly single-fluid synchronous grouting slurry for shield tunneling construction. Background technique [0002] At present, there are mainly two methods for synchronous grouting during shield tunneling construction: double-fluid grouting and single-fluid grouting. Corresponding synchronous grouting materials mainly include water glass double liquid slurry, cement slurry, cement-fly ash slurry, fly ash-lime slurry, etc. Double-liquid grouting is easy to block pipes, and there are many problems such as premature consolidation, grouting fluid not in place, or grouting volume far exceeding the theoretical amount; in addition, double-liquid grouting cannot meet the requirements of ultra-large diameter mud-water balance shields. In recent years, the synchronous grouting of mud-water balance shields has gradually tended to use fly ash-lime as ...

AI Technical Summary

Problems solved by technology

In 2010, the discharge of desulfurization gypsum used as waste for coal-fired power generation is expected to be 8.5 million tons, which will occupy a large amount of land and seriously pollute the environment

[0004] At present, the lime powder used in the single-liquid synchronous grouting used in shield construction needs to be produced by calcination, autoclaving and other processes. It is a material with high energy consumption and high pollution. the destruction of