Water-dispersion-resistant grouting material for reinforcing water-rich stratum of subway tunnel and preparation method of water-dispersion-resistant grouting material

A water-resistant and water-rich formation technology, applied in tunnels, tunnel linings, underground chambers, etc., can solve the problems of poor grouting reinforcement in the formation, poor reinforcement effect in the formation, and grout running out, etc., to increase plastic viscosity and Yield shear stress, increase in water dispersion resistance, effect of improving water dispersion resistance

Pending Publication Date: 2022-03-22
中国水利水电第七工程局成都水电建设工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The ground grouting reinforcement technology used in subway tunnel engineering has a good reinforcement effect on ordinary strata; but when the subway tunnel passes through water-rich strata with high water pressure such as underwater channels, there is a large amount of groundwater in the water-rich stratum, resulting in The effect of ground grouting reinforcement in subway tunnel engineering is poor: 1. The cement mortar is washed away by groundwater, and there are phenomena such as slurry running and leakage. The cement mortar cannot be hardened to form a consolidated body, and the purpose of strengthening the ground cannot be achieved; 2. When groundwater is added to cement mortar, the basic proportions such as slurry water-binder ratio and mortar-sand ratio are changed, and it is difficult for the slurry to form an effective consolidation body, and the reinforcement effect on the formation is poor; the above two reasons lead to a significant increase in the amount of grouting required Large, but the effect of grouting reinforcement is still difficult to guarantee

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  • Water-dispersion-resistant grouting material for reinforcing water-rich stratum of subway tunnel and preparation method of water-dispersion-resistant grouting material

Examples

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Effect test

Embodiment 1

[0021] A specific embodiment of the present invention is a kind of water-resistant and dispersed subway tunnel water-rich formation reinforcement grout, its components and mass ratio are: 266 parts of water, 306 parts of cement, 395 parts of medium fine sand, 4.6 parts of hydroxyethyl cellulose ether, 49.2 parts of polycarboxylate superplasticizer.

[0022] The cement in this example is ordinary Portland cement, the fineness modulus of medium-fine sand is 2.5, the maximum particle size is 5mm, and the bulk density is about 1500kg / m 3 Medium and fine sand, the viscosity of hydroxyethyl cellulose ether is 10W, the purity is greater than 99%, and the gas content of polycarboxylate water reducer is 2.99%.

[0023] The preparation method of the grouting material for the reinforcement of the water-rich stratum of the subway tunnel of the anti-water dispersion of this example, its steps are:

[0024] A. Weigh the water, cement, medium-fine sand, hydroxyethyl cellulose ether and poly...

Embodiment 2

[0038] A water-resistant and dispersion-resistant grouting material for the reinforcement of water-rich strata in subway tunnels. Its components and mass ratio are: 250 parts of water, 290 parts of cement, 390 parts of medium and fine sand, 3 parts of hydroxyethyl cellulose ether, poly Carboxylic acid superplasticizer 30 parts.

[0039] The cement in this example is ordinary Portland cement, the fineness modulus of medium-fine sand is 2.2, the maximum particle size is 4mm, and the bulk density is about 1500kg / m 3 Medium and fine sand, the viscosity of hydroxyethyl cellulose ether is 10W, the purity is greater than 98.5%, and the gas content of polycarboxylate water reducer is 2.90%.

[0040] The preparation method of the grouting material for the reinforcement of the water-rich stratum of the subway tunnel of the anti-water dispersion of this example, its steps are:

[0041] A. Weigh the water, cement, medium-fine sand, hydroxyethyl cellulose ether and polycarboxylate water red...

Embodiment 3

[0046] A water-resistant and dispersion-resistant grouting material for the reinforcement of water-rich strata in subway tunnels. Its components and mass ratio are: 280 parts of water, 320 parts of cement, 420 parts of medium and fine sand, 7 parts of hydroxyethyl cellulose ether, poly 70 parts of carboxylic acid water reducer.

[0047] The cement in this example is ordinary Portland cement, the fineness modulus of medium-fine sand is 2.2, the maximum particle size is 4.5mm, and the bulk density is about 1500kg / m 3 The medium-fine sand, the viscosity of hydroxyethyl cellulose ether is 10W, the purity is 98.2%, and the gas content of polycarboxylate water reducer is 2.85%.

[0048] The preparation method of the grouting material for the reinforcement of the water-rich stratum of the subway tunnel of the anti-water dispersion of this example, its steps are:

[0049] A. Weigh the water, cement, medium-fine sand, hydroxyethyl cellulose ether and polycarboxylate water reducer acco...

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Abstract

The invention discloses an anti-water-dispersion grouting material for reinforcing a water-rich stratum of a subway tunnel and a preparation method thereof. The grouting material comprises the following components in parts by mass: 250-280 parts of water, 290-320 parts of cement, 390-420 parts of medium-fine sand, 3-7 parts of hydroxyethyl cellulose ether and 20-50 parts of aluminum sulfate. The grouting material is good in fluidity, low in bleeding rate, excellent in water dispersion resistance and high in stability; the grouting agent is used for grouting a water-rich stratum of a subway tunnel, and can be quickly and fully injected and squeezed into cracks or gaps of the stratum; the concrete can be prevented from being dispersed by underground water in a water-rich stratum and can be quickly condensed to form a consolidated body; and the reinforcing effect on the water-rich stratum of the subway tunnel is good.

Description

technical field [0001] The invention relates to a grouting material for strengthening water-rich strata of a subway tunnel and a preparation method thereof. Background technique [0002] In the underground space of the city where the subway is built, the geological environment traversed by the subway tunnel is varied, and the excavation of the tunnel will inevitably destroy the initial stress state of the stratum, causing changes in the stress and strain state of the stratum, directly affecting a certain range around the excavation of the tunnel. The stability of the inner stratum leads to uneven settlement of the stratum, which in turn causes damage, cracks and uneven settlement of nearby buildings (structures), which directly affects the safety of nearby buildings (structures). [0003] At present, the common means of controlling ground settlement in subway tunnel engineering is ground grouting reinforcement. Ground grouting reinforcement is to inject cement slurry into t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04E21D11/10
CPCC04B28/04E21D11/10C04B2111/00724C04B2111/00732C04B2201/50C04B14/06C04B24/383C04B2103/302
Inventor 任跃勤吴宗林聂华张伯夷石军杨锋陈佳黄钞杨泳森杨军周建辉张刚武王先明王士民
Owner 中国水利水电第七工程局成都水电建设工程有限公司
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