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A kind of admixture for improving water-rich sand egg formation shield dregs and its preparation method

A technology of soil improvement and admixture

Active Publication Date: 2021-06-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the object of the present invention is to provide a water-rich soil solution for the problems such as large soil permeability coefficient, easy gushing, no cohesion, poor flow plasticity of the soil, poor transmission effect, and difficulty in soil discharge in the water-rich sand egg formation. The muck modifier for earth pressure balance shield tunneling in sand egg formation and its preparation method can better avoid and reduce the occurrence of gushing during the construction of earth pressure balance shield tunneling after improvement, so as to ensure the safe and smooth implementation of construction, and the soil under cutting Body is easy to transport

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 8% mass content of mineral modifier into water, stir to dissolve it, add sodium carbonate to adjust the pH to 8, add 0.2% mass content of anionic polyacrylamide, 0.1% mass content of cetyl hydroxyethyl cellulose and 0.06% mass content of sodium lauryl alcohol polyoxyethylene ether sulfate is mixed and added to water, the stirring speed is controlled at 45-60 revolutions per minute, stirred to make it dissolve evenly, and 4% mass content of polyethylene glycol is added and stirred to fully dissolve mix.

[0039] After injecting the prepared admixture into the experimental dregs (injection rate of 5% by volume), the measured slump is 180mm, and the permeability coefficient is 6.25×10 -6 cm / s.

Embodiment 2

[0041] Add 9% mass content of mineral modifier into water, stir to dissolve it, add sodium carbonate to adjust the pH to 8, add 0.4% mass content of anionic polyacrylamide, 0.2% mass content of cetyl hydroxyethyl cellulose and 0.12% mass content of sodium lauryl alcohol polyoxyethylene ether sulfate is mixed and added to water, the stirring speed is controlled at 45 to 60 revolutions per minute, stirred to make it dissolve evenly, and 4% mass content of polyethylene glycol is added and stirred to fully dissolve mix.

[0042] After injecting the prepared admixture into the experimental dregs (injection rate of 5% by volume), the measured slump is 203mm, and the permeability coefficient is 4.24×10 -6 cm / s.

Embodiment 3

[0044] Add 10% mass content of mineral modifier into water, stir to dissolve it, add sodium carbonate to adjust the pH to 8, add 0.6% mass content of anionic polyacrylamide, 0.3% mass content of cetyl hydroxyethyl cellulose and 0.25% mass content of sodium lauryl alcohol polyoxyethylene ether sulfate is mixed and added to water, the stirring speed is controlled at 45-60 revolutions per minute, stirred to make it dissolve evenly, and 4% mass content of polyethylene glycol is added and stirred to fully dissolve mix.

[0045] After injecting the prepared admixture into the experimental dregs (injection rate of 5% by volume), the measured slump is 215mm, and the permeability coefficient is 2.74×10 -6 cm / s.

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Abstract

The present invention provides a water-rich sand egg formation shield dreg improvement admixture and a preparation method thereof. The dreg improvement admixture is a water-rich sand egg formation shield dreg improvement admixture, which comprises or consists of the following mass: Content composition: tackifier A 0.1~1wt%, tackifier B 0.025~1wt%, surfactant 0.025~0.5wt%, pumping agent 1~10wt%, pH regulator 0.01~0.06wt%, mineral 5-15wt% class modifier and water. After the dregs improvement admixture described in the present invention is used to improve the shield muck in the water-rich sand egg formation, it can better avoid and reduce the occurrence of gushing during the construction of the earth pressure balance shield, and ensure the safe and smooth implementation of the construction. And the cut soil is easy to transport.

Description

technical field [0001] The invention relates to the technical field of road construction, in particular to an admixture for improving water-rich sand egg formation shield dregs and a preparation method thereof. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The earth pressure balance shield excavates the tunnel through the balance between the soil pressure of the soil bin and the water and soil pressure of the excavation surface. In experiments, it is generally considered that the permeability coefficient is not greater than 10 -5 The soil mass with a cm / s level and a slump of 150-220 mm meets the excavation conditions. [0004] In the process of muck improvement, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/06C04B24/38
CPCC04B40/0039E21D9/0678C04B14/104C04B22/002C04B22/10C04B24/2652C04B24/383C04B24/166C04B24/32
Inventor 李树忱段壮袁超王修伟支斌周慧颖万泽恩王九公刘祥坤王曼灵
Owner SHANDONG UNIV