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A single grout and a tunnel stabilization method using the same

A single-slurry, tunnel technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems that the expected reinforcement effect cannot be achieved, the cement slurry is difficult to pour, and the cement slurry is easy to lose, so as to reduce the time of entry and exit, and improve The effect of spreading and spreading and easy operation

Active Publication Date: 2020-09-04
广州市泰利斯固结补强工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention provides a stable cement-sodium silicate single slurry that improves tunnel settlement in an operating subway tunnel. It has the characteristics of not being easily diluted and discretely lost, and at the same time it can spread well in the silty sand layer in the water-rich area. It solves the technical problem that the cement slurry in the fine sand layer is difficult to pour into and the cement slurry in rich water is easy to lose, and the expected reinforcement effect cannot be achieved.

Method used

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  • A single grout and a tunnel stabilization method using the same
  • A single grout and a tunnel stabilization method using the same
  • A single grout and a tunnel stabilization method using the same

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specific Embodiment 1

[0086] An operating shield subway tunnel is located in a water-rich powder-fine sand geological environment. The water content of the powder-fine sand layer is 23-31%, the saturation is 84-100%, and the sand diameter is 0.075-0.25mm, accounting for 38-73%. Good water permeability. The subway has been in operation for many years. Affected by the vibration of the subway, the fine sand layer at the base of the tunnel has been corroded and lost, resulting in uneven settlement of the subway structure. The maximum sinking position is about 15-17cm. It will directly affect the safe running of the track.

[0087] In this embodiment, the single grout of the following formula by weight is used for grouting reinforcement:

[0088] Water: cement = 80: 100;

[0089] Water glass: cement = 1.8: 100;

[0090] Early strength agent: cement = 5:100;

[0091] Among them, the early strength agent is selected from inorganic normal salts or acid salt compounds (such as: sodium acetate, sodium ph...

specific Embodiment 2

[0096] A shield tunnel that has been built and operated for one year was affected by the vibration of the vehicle, and the mud-sand layer at the base of the tunnel settled, with an uneven settlement of about 2.0cm. In order to control the settlement of the tunnel and ensure the safe operation of the subway, a single grout is used for grouting reinforcement. This treatment only grouts the rear wall grouting hole of the lower semicircular side wall of the tunnel. Specifically, the grouting hole behind the wall at the 4 o'clock position and the 8 o'clock position can be selected for grouting, and the grouting pressure is 0.4mpa. The formula in parts by weight of the single grout used in the grouting process is as follows:

[0097] Water: cement = (60 ~ 80): 100;

[0098] Water glass: cement = (0.8 ~ 1.6): 100;

[0099] Early strength agent: cement = 3:100;

[0100] Water reducer: cement = 1:100;

[0101] Among them, the early strength agent is selected from inorganic normal s...

specific Embodiment 3

[0104] The shield tunnel under construction for track laying, due to the sudden increase of water pressure behind it, the tunnel structure will rise, and the tunnel segments will be staggered, with a maximum staggered amount of 3-5cm. In order to ensure the safety of the tunnel structure and smooth track laying, the grouting hole behind the wall located on the upper semicircular side wall of the original structure is used for grouting reinforcement. The weight formula of the single grout used in the grouting process is as follows:

[0105] Water: cement = (60 ~ 80): 100;

[0106] Water glass: cement = (1.5~2.0): 100;

[0107] Early strength agent: cement = 3:100;

[0108] Tackifier: cement = 3:100;

[0109] Wherein, the early strength agent is selected from inorganic normal salt or acid salt compound (such as: sodium acetate, sodium phosphate, sodium aluminate nitrite and acid salt); the thickener is selected from inorganic bentonite or organic cellulose, such as Na-based b...

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Abstract

The invention discloses single slurry and a tunnel stabilizing method using the same. The single slurry comprises cement, sodium silicate, water and a modifier, wherein the weight ratio of the water to the cement to the sodium silicate to the modifier is (60-80):100:(5-20):(0.5-5), the cement is 42.5R ordinary Porland cement, and the baume degree of the sodium silicate is 35-52. A preparation method of the single slurry includes: evenly mixing and stirring the water and the cement to prepare cement slurry; adding the modifier, and evenly stirring; adding the sodium silicate, and evenly stirring. The tunnel stabilizing method includes: preparing the single slurry; arranging first grouting holes, and grouting; if tunnel settlement or lifting is not controlled effectively, entering the next step; arranging second grouting holes, and grouting; if tunnel settlement or lifting is not controlled effectively, entering the next step; performing secondary supplementary grouting. By the single slurry and the tunnel stabilizing method, the technical problems that fine sand layer cement slurry is hard in grouting and water-rich cement slurry is prone to loss are solved.

Description

technical field [0001] The technical field of tunnel construction of the present invention particularly relates to a single grout and a method for stabilizing a tunnel using the single grout. Background technique [0002] The grouting stabilization treatment for the silt and fine sand layer of the tunnel base, especially the grouting stabilization treatment under the geological conditions of flowing water, has a relatively high construction risk and is prone to engineering construction problems. There are two commonly used grouting stabilization methods: [0003] 1. Cement slurry single-liquid grouting method: Firstly, according to the water-cement ratio in the project, add the cement slurry into the pulping machine to make a single-liquid cement slurry, and then inject the cement slurry into the reinforcement part through the grouting pump; [0004] 2. Cement-water glass double liquid grouting method: first prepare cement slurry and water glass slurry according to the proj...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/10C04B28/04
CPCC04B28/04E21D9/002E21D11/10C04B22/002C04B12/04C04B2103/12C04B2103/302C04B2103/44
Inventor 邱小佩杨洋
Owner 广州市泰利斯固结补强工程有限公司
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