Composition for tunnel backwall filling, consolidation fluid and preparation method

A composition and tunnel wall technology, applied in the field of filling mud materials, can solve problems such as poor effect, and achieve the effects of good working performance, easy operation and high curing strength

Inactive Publication Date: 2019-05-03
SANCHU OF CHINA RAILWAY TUNNEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing filling materials often use traditional mud, which has a poor effect after filling and curing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] A method for preparing a composition used for post-filling tunnel walls, comprising the steps of: uniformly mixing bentonite, carboxymethylcellulose soluble salt, carbonate soluble salt and polyacrylamide with water, and obtaining inert drag reduction after hydration swelling mud.

[0022] Further, the hydration time is more than 10 hours.

[0023] Further, the performance indicators of the prepared inert drag-reducing swelling mud are as follows: specific gravity: 1.04-1.08; viscosity: 80-110s; colloid rate: ≥98%; water loss rate: ≤10%; mud thickness: ≤2mm / 30min; static shear force: 3~5pa; pH value: 7~9 and grouting pressure: 360~540Kpa.

[0024] A consolidating liquid used for post-filling of tunnel walls, the consolidating liquid is formed by mixing cement slurry and inert drag-reducing swelling mud; the cement slurry is mixed with water and cement according to the weight ratio of 1:0.8-1.3 Made; the compressive strength of the consolidation liquid is above 1MPa d...

Embodiment 1

[0046] A composition for post-filling tunnel walls, mainly prepared from the following raw materials in parts by weight: 70 parts of bentonite; 1 part of potassium carboxymethylcellulose; 0.1 part of potassium carbonate and 0.1 part of polyacrylamide.

[0047] A method for preparing a composition used for backfilling tunnel walls, comprising the steps of uniformly mixing bentonite, potassium carboxymethylcellulose, potassium carbonate and polyacrylamide with water, and obtaining inert drag-reducing bentonite mud after hydration; The hydration time is 10h.

Embodiment 2

[0049] A composition for post-filling tunnel walls, prepared from the following raw materials in parts by weight: 80 parts of bentonite; 2 parts of carboxymethylcellulose potassium; 1 part of potassium carbonate, 0.6 parts of polyacrylamide and 1000 parts of water.

[0050] A method for preparing a composition used for backfilling tunnel walls, comprising the steps of uniformly mixing bentonite, potassium carboxymethylcellulose, potassium carbonate and polyacrylamide with water, and obtaining inert drag-reducing bentonite mud after hydration; The hydration time is 12h.

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Abstract

The invention belongs to the technical field of filling slurry materials, the invention discloses a composition for tunnel backwall filling, a consolidation fluid and a preparation method; the composition is mainly prepared from the following raw materials in parts by weight: 70-80 parts of bentonite; 1-2 parts of a carboxymethyl cellulose soluble salt; 0.1-1 part of a carbonic acid soluble salt and 0.1-0.6 part of polyacrylamide; wherein the consolidation fluid is formed by mixing cement slurry and inert drag-reducing bentonite slurry; wherein the cement slurry is prepared by mixing water andcement according to the weight ratio of 1: 0.8-1.3; and the compressive strength of the consolidation fluid is more than 1 mpa during solidification. The preparation method comprises the following steps: dissolving the bentonite, the carboxymethyl cellulose soluble salt, the carbonic acid soluble salt and the polyacrylamide are uniformly mixed with water, and after hydration, the inert drag-reducing bentonite slurry is obtained. The composition has the characteristics of high curing strength and good wall protection effect.

Description

technical field [0001] The invention belongs to the technical field of filling mud materials, and in particular relates to a composition for post-filling of tunnel walls, a consolidation liquid and a preparation method. Background technique [0002] Post-wall grouting refers to supplementary grouting to fill the gaps between the lining and surrounding rock, the primary support and the secondary lining after the lining is completed. The fluidity, strength, shrinkage rate, gel time (that is, the time to start waterproofing and not harden) and other properties of the grouting fluid behind the wall are important factors in the selection of grout, which are directly related to the settlement, water leakage, air leakage and other properties of the formation. Periodic test checks must be carried out on the injected slurry. The main test items of the slurry include fluidity, viscosity, water separation rate, gel time, strength, etc. Qualified measuring instruments must be used dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B26/28C04B28/00
Inventor 裴超宋永智杨义马召广舒丹田孝波
Owner SANCHU OF CHINA RAILWAY TUNNEL GROUP
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