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An early-strength grouting material behind the shield wall

A technology of shield wall and post-grouting is applied in the field of post-grouting material for early-strength shield wall, post-grouting material for early-strength shield wall, and grouting material. Long time, damage, etc.

Active Publication Date: 2020-10-30
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the unfavorable working conditions such as long coagulation time in the early stage of the single-liquid slurry cause formation deformation, poor fluidity make it difficult to clean the plugged pipe, and low early strength cause the segment to float up and cause damage. These are important problems that plague engineers and need to be solved urgently

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An early-strength type shield tunnel wall post-grouting material, comprising a mixture of various materials in parts by weight: 800 parts by weight of 150 mesh quartz sand, 40 parts by weight of 200 mesh sodium bentonite, and 110 parts by weight of F class II fly ash Parts, 460 parts by weight of Portland cement, 80 parts by weight of gypsum, 5 parts by weight of early strength agent, 10 parts by weight of organic additives, and 400 parts by weight of water.

[0035] Among them, the early strength agent includes triethanolamine, sodium chloride and calcium formate, the weight ratio of triethanolamine, sodium chloride and calcium formate is 1:1.2:0.8; organic additives include methyl phenyl silicone resin, calcium stearate and calcium formate. The weight ratio of microcrystalline cellulose, methylphenyl silicone resin, calcium stearate and microcrystalline cellulose is 1:0.8:0.6; stirring time is 4min, grouting pressure is about 0.6MPa, and grouting flow is 100L / min Left an...

Embodiment 2

[0044] An early-strength type shield tunnel wall post-grouting material, comprising a mixture of various materials in parts by weight: 900 parts by weight of 200 mesh quartz sand, 35 parts by weight of 200 mesh sodium bentonite, and 170 parts by weight of class F class II fly ash Parts, 400 parts by weight of ordinary Portland cement, 70 parts by weight of anhydrous gypsum, 2.4 parts by weight of triethanolamine, 1.92 parts by weight of calcium formate, 2.88 parts by weight of sodium chloride, 7.2 parts by weight of early strength agent, 6.67 parts by weight of methyl phenyl silicone resin Parts by weight, 5.33 parts by weight of calcium stearate, 4 parts by weight of microcrystalline cellulose, and 540 parts by weight of water. The mixing time is 4min, the grouting pressure is about 0.6MPa, the grouting flow is about 100L / min, the upper and lower ratio of four-point grouting is 6.5:3.5, and the injection rate is 140%.

[0045] The density of the slurry prepared with this formula...

Embodiment 3

[0047] An early-strength type shield tunnel wall post-grouting material, which comprises a mixture of various materials in parts by weight: 1000 parts by weight of 180 mesh quartz sand, 50 parts by weight of 200 mesh sodium bentonite, and 220 parts by weight of F class II fly ash Parts, 600 parts by weight of ordinary Portland cement, 100 parts by weight of anhydrous gypsum, 8 parts by weight of early strength agent, 20 parts by weight of methyl phenyl silicone resin, and 600 parts by weight of water; wherein, the early strength agent includes triethanolamine, chlorine The weight ratio of sodium chloride to calcium formate, triethanolamine, sodium chloride and calcium formate is 1:1.2:0.8.

[0048] Among them, the mixing time is 4min, the grouting pressure is about 0.6MPa, the grouting flow is about 100L / min, the upper and lower ratio of four-point grouting is 6.5:3.5, and the injection rate is 140%.

[0049] The density of the slurry prepared with this formula is 1.91g / cm 3 , The ...

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Abstract

The invention belongs to the field of underground engineering, in particular to an early-strength shield wall back grouting formula, comprising the following materials in parts by weight: 800-1000 parts by weight of fine sand, 35-50 parts by weight of bentonite, and 110 parts by weight of fly ash -220 parts by weight, 400-600 parts by weight of Portland cement, 70-100 parts by weight of gypsum, 5-8 parts by weight of early strength agent, and 400-600 parts by weight of water. It not only has a fast coagulation speed, but also has the characteristics of high early strength. At the same time, it can effectively guarantee the strength and shear resistance in the later stage of grouting, control the deformation of the formation and the floating of the segment, and reduce the damage of the segment.

Description

Technical field [0001] The invention belongs to the field of underground engineering, and relates to a grouting material, in particular to an early-strength shield wall post-grouting grout suitable for gravel-sand formations, in particular to an early-strength shield wall post-injection Pulp material. Background technique [0002] At present, grouting behind the wall has become an indispensable work content in shield construction. Back-wall grouting is to pump the liquid grouting material into the annular shield tail pores behind the segments, so as to reduce the stress release and deformation of the formation. Therefore, ideally, the slurry should maintain the same physical characteristics and characteristics as the formation. status. As shield tunnels pass through the ground more and more complex, the grout often cannot reach the physical and mechanical state consistent with the ground in a short time. The resulting ground deformation accounts for about 30%-40% of the ground ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/20C04B2201/50C04B14/06C04B14/104C04B18/08C04B22/143C04B24/42C04B24/04C04B24/122C04B22/124
Inventor 闵凡路宋航标马佳伟刘来仓杜瑞柏煜新
Owner HOHAI UNIV
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