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A kind of ground subsidence shell filling material for shield tunneling and its preparation method

A technology of filling materials and shield tunneling, which is applied in the field of shield casing anti-subsidence filling materials and its preparation, and can solve the problem of being unable to use liquid A and liquid B alternately for grouting, reducing the uniformity of filling, and increasing pumping Difficulty and other issues, to achieve the effect of reducing the risk of shield stuck, good anti-dilution and water-repelling properties, and reducing damage

Active Publication Date: 2019-09-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The volume ratio of liquid A and liquid B is 50-100:1, and the amount of liquid B used is relatively small, so the two solutions can only be mixed evenly before grouting, and the method of alternate grouting of liquid A and liquid B cannot be used
However, the filling material after the uniform mixing of liquid A and liquid B has a very high viscosity, which greatly increases the difficulty of pumping, and when the viscosity of the mixed slurry is high, although a higher bearing strength can be achieved, due to the fluidity of the slurry Reduced, reducing the uniformity of filling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Prepare material A and material B according to the following ratio, and mix them to obtain shell filling material for shield tunneling:

[0039] Material A: bentonite: 25%, colloid stabilizer: 3%, thickener: 3%, water repellant 1%, water: 66%.

[0040] Material B: Water glass: 50%, water: 50%.

[0041] The colloidal stabilizer is a retarder;

[0042] The thickener is polyacrylamide;

[0043] The waterproofing agent is a silicone waterproofing agent.

[0044] First mix bentonite and water uniformly in proportion, and keep stirring. After they are mixed evenly, add colloidal stabilizer, thickener and waterproofing agent to it in turn, and keep stirring to obtain material A. Mix water glass and water uniformly in proportion to obtain material B, and mix the two materials at a ratio of 1:1 to obtain filling material.

[0045] When in use, equal volumes of material A and material B are pumped to the outside of the shield casing for mixing to obtain a filling material wit...

Embodiment 2

[0047] Prepare material A and material B according to the following ratio, and mix them to obtain shell filling material for shield tunneling:

[0048] Material A: bentonite: 26%, colloid stabilizer: 4%, thickener: 4%, water repellant: 3%, water: 63%.

[0049] Material B: Water glass: 50%, water: 50%.

[0050] The colloidal stabilizer is a retarder;

[0051] The thickener is polyacrylamide;

[0052] The waterproofing agent is a silicone waterproofing agent.

[0053] First mix bentonite and water uniformly in proportion, and keep stirring. After they are mixed evenly, add colloidal stabilizer, thickener and waterproofing agent to it in turn, and keep stirring to obtain material A. Mix water glass and water uniformly in proportion to obtain material B, and mix the two materials at a ratio of 1:1 to obtain filling material.

[0054] When in use, equal volumes of material A and material B are pumped to the outside of the shield casing for mixing, and a filling material with go...

Embodiment 3

[0056] Prepare material A and material B according to the following ratio, and mix them to obtain shell filling material for shield tunneling:

[0057] Material A: bentonite: 25%, colloidal stabilizer: 5%, thickener: 5%, water repellent: 5%, water: 60%.

[0058] Material B: Water glass: 50%, water: 50%.

[0059] The colloidal stabilizer is a retarder;

[0060] The thickener is polyacrylamide;

[0061]The waterproofing agent is a silicone waterproofing agent.

[0062] First mix bentonite and water uniformly in proportion, and keep stirring. After they are mixed evenly, add colloidal stabilizer, thickener and waterproofing agent to it in turn, and keep stirring to obtain material A. Mix water glass and water uniformly in proportion to obtain material B, and mix the two materials in a ratio of 1:1 to obtain filling material.

[0063] When in use, equal volumes of material A and material B are pumped to the outside of the shield casing for mixing, and a filling material with g...

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Abstract

The invention discloses a stratum settlement-preventing shield shell filling material and a preparation method thereof. The stratum settlement-preventing shield shell filling material is prepared by mixing comprises a material A and a material B, wherein the material A comprises the following components: 25-30% of bentonite, 3-5% of a thickener, 3-5% of a colloidal stabilizer, 1-6% of a water-proofing agent and the balance of water; the material B comprises the following components: 45-55% of water glass and the balance of water; the volume ratio of the material A to the material B is 1:(0.8-1.2). In the filling material, the material A and the material B can be pumped according to equal volume, and after the material A and the material B meet each other and are mixed, a mixture can be quickly viscosified and has high viscosity and certain supporting strength, so that even if the material A and the material B are pumped out of a shield shell, the stratum settlement-preventing shield shell filling material can still effectively fill a gap above the shield shell and can effectively prevent the stratum settlement.

Description

technical field [0001] The invention relates to the field of shield tunnel construction in underground engineering, in particular to a filling material for an anti-ground subsidence casing for a shield tunnel and a preparation method thereof. Background technique [0002] With the continuous development of subway construction, shield method tunnel construction is more and more widely used. Ground settlement is an unavoidable problem in shield method construction. Excessive ground settlement will cause accidents such as ground collapse and building collapse. Since the gap between the soil and the shield shell caused by the over-excavation of the cutterhead is the main reason for the formation subsidence, it is necessary to fill the gap with shell filling material to prevent the formation subsidence. As an important material to prevent formation subsidence, shell filling materials are receiving more and more attention. Most of the filling materials on the market use cement slu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/26
Inventor 李树忱耿哲赵世森梁娜陈健张靖宇王承震赵国栋胡浩
Owner SHANDONG UNIV
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