A synchronous grouting slurry for shield tunnels suitable for water-rich sand layers

A technology of shield tunneling and synchronous grouting is applied in the field of shield tunnel construction building materials, which can solve the problems of easy blockage of grouting pipelines, unsatisfactory application effect, poor settlement control effect, etc., and achieves good water resistance and dispersion. , The effect of good pumpability and easy slurry quality

Inactive Publication Date: 2016-08-10
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are many problems in the application of these three kinds of slurries in water-rich sand layers, and the application effect is not ideal.
The traditional inert slurry uses fly ash, bentonite and sand as the main raw materials. Although it has good fluidity and is convenient for grouting, it has obvious disadvantages, such as easy segregation of the slurry, poor water dispersion resistance, and low later strength. Serious slurry loss, less effective in controlling settlement
The single-liquid hardenable slurry uses cement, fly ash, bentonite and sand as the main raw materials. Although this type of slurry has high early strength, it is easy to segregate and has poor water dispersion resistance, which will also cause slurry loss and easy pipe plugging , it is also not suitable for simultaneous grouting of shield tunneling in water-rich sand layers
The main raw materials of double liquid slurry are cement, water glass, fly ash, bentonite and sand. Although this kind of slurry is not easy to segregate and has good water dispersion resistance, the construction control is complicated, and it is easy to block the grouting slurry pipeline, and the pipeline Difficult to clean, not conducive to long-distance construction

Method used

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  • A synchronous grouting slurry for shield tunnels suitable for water-rich sand layers
  • A synchronous grouting slurry for shield tunnels suitable for water-rich sand layers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The weight ratio of each raw material component (kg / m 3 )for:

[0039] Slaked lime 70; fly ash 600; bentonite 60; sand 900; polystyrene powder 1; silicon powder 2; water reducer 4; polyacrylamide 1; gypsum 4; water 330.

[0040] The slurry has a bleeding rate of about 3%, a volume shrinkage rate of 2%, a setting time of 8 to 12 hours, an initial slump of 24 to 26 cm, a slump of not less than 23 cm within 3 hours, and a slump within 8 hours. The fluidity is not less than 19cm, and the fluidity is not less than 230mm within 6 hours.

[0041] The water reducer is a commercially available naphthalene-based water reducer, and the air-entraining agent is sodium dodecylbenzenesulfonate.

Embodiment 2

[0043] The weight ratio of each raw material component (kg / m 3 )for:

[0044] Slaked lime 50; fly ash 500; bentonite 100; sand 1100; polystyrene powder 3; silicon powder 1; water reducer 3; polyacrylamide 1; gypsum 2; air-entraining agent 1; water 310;

[0045] The slurry has a bleeding rate of about 4%, a volume shrinkage rate of about 4%, a setting time of 10 to 14 hours, an initial slump of 24 to 26 cm, a slump of not less than 22 cm within 3 hours, and a flow within 6 hours. The length is not less than 220mm.

[0046] The water reducer is a commercially available naphthalene-based water reducer, and the air-entraining agent is sodium dodecylbenzenesulfonate.

Embodiment 3

[0048] The weight ratio of each raw material component (kg / m 3 )for:

[0049] Slaked lime 35; Fly ash 650; Bentonite 70; Sand 800; Silica fume 1; Water reducer 2; Polyacrylamide 0.5; Gypsum 1; Tetra-n-propyl zirconate 2;

[0050] The slurry has a bleeding rate of about 5%, a volume shrinkage rate of about 3%, a setting time of 12 to 14 hours, an initial slump of 24 to 26 cm, a slump of not less than 23 cm within 3 hours, and a flow within 6 hours. The height is not less than 230mm.

[0051] The water reducer is a commercially available naphthalene-based water reducer, and the air-entraining agent is sodium dodecylbenzenesulfonate.

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Abstract

The invention provides a shield tunnel synchronous grouting slurry applicable to a water-rich sand layer. The slurry comprises, by weight (kg / m3), 30 to 80 of slaked lime powder, 250 to 700 of fly ash, 50 to 120 of bentonite, 800 to 1200 of medium and fine sand, 1 to 5 of polystyrene powder, 1 to 10 of silicon powder, 1 to 6 of a water reducer, 1 to 5 of a modifier, 1 to 3 of an air entraining agent and 260 to 340 of water. The slurry has the characteristics of good water retention, good water dispersibility resistance, small volume shrinkage, great density, long coagulation time, good plastic flowing performance, uneasy tube plugging, resistance to vibratory liquefaction, etc.; a slurry test block reaches strength of undisturbed soil in 2 to 4 d and reaches 4 MPa in 28 d; each performance index of the slurry is better than that of common hardenable slurry and current inertial slurry; and the slurry is especially applicable to a water-rich sand land layer and has an outstanding settlement control effect on a shield tunnel.

Description

technical field [0001] The invention relates to a synchronous grouting grout suitable for a shield tunnel in a water-rich sand layer. The invention belongs to the technical field of shield tunnel construction building materials. Background technique [0002] The shield synchronous grouting technology refers to the grouting while excavating in the process of shield tunneling. When the segment is out of the shield tail, under a certain grouting pressure, an appropriate amount of grouting material is injected into the gap of the shield tail. It can fill the building gap behind the wall in time, so it has a good effect on controlling the ground settlement caused by shield tunneling construction, and it is convenient for grouting construction, so it is widely used at present. [0003] The main function of synchronous grouting grout in shield tunnel construction is to fill the gap in the shield tail building in time and control the settlement of the ground. The main control indic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/10
Inventor 袁大军乔国刚董朝文
Owner BEIJING JIAOTONG UNIV
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