Compensation grouting material and grouting method thereof

Abstract

The invention discloses a supplementary grouting material. The supplementary grouting material is mainly prepared from a denitrifying bacteria solution and a mixed salt solution, wherein the mixed salt solution is prepared from nutritive salt, a carbon source, a nitrogen source, a calcium source and deionized water, and the nutritive salt is mainly monopotassium phosphate, magnesium sulfate heptahydrate and sodium chloride. The invention further discloses a grouting method of the supplementary grouting material; the method comprises the following steps that 1, the denitrifying bacteria solution and the mixed salt solution are evenly mixed to prepare the supplementary grouting material; 2, a peristaltic pump is adopted for pouring the supplementary grouting material prepared in the step 1 in a stratum for supplementary grouting. Slurry of the supplementary grouting material does not contain solid particles, is good in mobility and low in viscosity, has good groutability performance forthe dense stratum, can diffuse and infiltrate the stratum without large grouting pressure, has small disturbance to the stratum, and is suitable for filling a grouting blind area.

Description

technical field [0001] The invention relates to the fields of hydraulic engineering and foundation treatment engineering, in particular to a compensation grouting material and a grouting method thereof. Background technique [0002] At present, cement-based grout is a commonly used material in grouting engineering, but due to the complexity of the stratum and the viscosity of the grout itself, the grout spreads unevenly, resulting in a grouting blind area between two adjacent grouting holes, making it difficult to form a closed grouting Anti-seepage curtain, and the foundation stability is poor, under the action of seepage water pressure or other external loads, it is easy to form leakage channels or weak surfaces. Therefore, in order to eliminate this area and improve the grouting quality of the anti-seepage curtain, it is necessary to perform compensation grouting on the blind area after grouting. However, the blind area of ​​grouting is compacted by the initial grouting p...

AI Technical Summary

Problems solved by technology

[0002] At present, cement-based grout is a commonly used material in grouting engineering, but due to the complexity of the stratum and the viscosity of the grout itself, the grout spreads unevenly, resulting in a grouting blind area between two adjacent grouting holes, making it difficult to form a closed grouting Anti-seepage curtain, and the foundation stability is poor, under the action of seepage water pressure or other external loads, it is easy to form leakage channels or weak surfaces

Therefore, in order to eliminate this area and improve the grouting quality of the anti-seepage curtain, it is necessary to perform compensation grouting on the blind area after grouting. However, the blind area of ​​grouting is compacted by the initial grouting pressure, resulting in dense soil and poor groutability. Compensation grouting materials often have the following problems:

[0003] (1) When cement-based slurry is used, the solid particle size of the slurry is large, it is difficult to pour into the dense formation, and the stability is poor, water will be precipitated after curing, the volume shrinkage is large, and new pores are easily formed in the formation; and cement-based slurry The filling of materials requires a large grouting pressure, which has a large disturbance to the foundation, which is especially harmful to the safety and stability of hydraulic engineering buildings.

[0004] (2) When chemical materials are used, although they have good pourability, they are easy to pollute the environment, and the damage to the environment may be irreparable, especially the pollution to the groundwater environment, and the cost is relatively high;

[0005] (3) Biological grouting materials that have been studied more at present, such as Bacillus pasteurianus slurry, can hydrolyze urea into ammonia gas under aerobic conditions, but the toxic by-product of ammonia gas has been controversial by experts at home and abroad, because It is harmful to the environment and the human body, so it has not been able to be put into large-scale production and use in projects; and this biological grouting material is especially not suitable for deep, anoxic foundations such as water conservancy projects, and is only suitable for concrete crack sealing and masonry ancient buildings. The protection of water conservancy projects cannot solve the problem of deep foundation leakage

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