Collapsible loess composite grouting material as well as preparation method and application thereof

Abstract

The invention discloses a collapsible loess composite grouting material, which comprises a liquid A and a liquid B. The liquid A and the liquid B are independently stored and mixed in use. The liquidA comprises following components in parts by weight: 60-100 parts of water, 100 parts of cement and 5-15 parts of an accelerator. The liquid B comprises the following components in parts by weight: 100 parts of water and 100 parts of water glass. The grouting material has the advantages that the solidification speed is quick, the solidification time is easy to control, the permeability is good, and the impermeability is good. The grouting material is suitable for solidification of tunnel full-section water-rich collapsible loess, collapsible loess foundation treatment of newly-built buildingsor equipment foundations and collapsible loess foundation treatment of buildings or equipment foundations with differential settlement. The invention also discloses a preparation method of the collapsible loess composite grouting material. The preparation method comprises the following steps: fully stirring 60-100 parts of water and 100 parts of cement to form cement slurry, adding 5-15 parts of an accelerator into the cement slurry to form a liquid A; and uniformly stirring 100 parts of water and 100 parts of water glass to form a liquid B. When the collapsible loess composite grouting material is used, the liquid A and the liquid B are mixed to obtain the collapsible loess composite grouting material.

Description

technical field [0001] The invention relates to the technical field of grouting and solidification, in particular to a collapsible loess composite grouting material and its preparation method and application. Background technique [0002] When constructing tunnels in the water-rich and collapsible loess section, in order to prevent water and sand gushing in the excavation surface, grouting materials (or called grout) are often used to grout the excavation surface. The grouting method is generally formulated in a certain proportion. Cement single slurry, cement water glass double slurry or modified water glass chemical slurry. The slurry infiltrates and diffuses into the pores of the soil layer and solidifies, forming concretions with a certain strength with the surrounding broken rocks, forming a consolidated water blocking curtain around the tunnel and the excavation surface, cutting off the groundwater flow path. [0003] However, at present, in the actual construction pr...

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Problems solved by technology

On the one hand, the boiling water glass diluent is highly dangerous, and the heating time is longer, which affects the normal progress; on the other hand, the slurry may accelerate the shortening of the service life of the grouting pipe under high temperature conditions, and is less destructive to the grouting pipe. Big;

[0006] (3) The solidification time of the grout cannot be accurately grasped, and the grouting material for solidification of water-rich collapsible loess needs to be solidified quickly to solve the fundamental problem

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