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Shield mud system applicable to extra-large-diameter tunnel and preparation method

A technology of tunnel shielding and mud, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of reducing construction progress, wear of shield cutters, delays in construction period, etc., to reduce environmental pressure, balance soil pressure, The effect of preventing mud bag

Inactive Publication Date: 2019-05-17
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the shield construction process, due to the complex geological conditions, the cut silt and fine sand drilling cuttings and mudstone will cause serious wear and damage to the shield cutter, and frequent replacement of the cutter head will delay the construction schedule and reduce the construction progress. Therefore, the shield mud should meet certain requirements. The shield cutter head wear reduction requirements

Method used

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  • Shield mud system applicable to extra-large-diameter tunnel and preparation method
  • Shield mud system applicable to extra-large-diameter tunnel and preparation method
  • Shield mud system applicable to extra-large-diameter tunnel and preparation method

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preparation example Construction

[0020] Embodiments of the present invention also provide a preparation method suitable for a shield mud system of an extra-large diameter tunnel, comprising the following steps:

[0021] S1 Weigh 100 parts by mass of water, add 0.2 to 0.4 parts by mass of anti-friction catabolism agent into the water, stir for 10 minutes under the stirring condition of 6000r / min, and stir evenly;

[0022] S2 Add 5 to 6 parts by mass of dispersed film-forming agent to the solvent in step S1 under the stirring condition of 100r / min, and stir for 16h;

[0023] S3, under the condition of stirring at 6000r / min, add 1-2 parts by mass of fluid loss reducer, 0.2-0.4 parts by mass of viscosity-increasing agent, 0.4-0.6 parts by mass of plugging agent, and The selective flocculant is 0.02-0.03 parts by mass, and it is uniformly stirred to obtain a shield mud system suitable for super-large diameter tunnels.

Embodiment 1

[0025] A shield mud system suitable for super-large diameter tunnels, prepared from the following raw materials: 1000ml of water, 50g of sodium bentonite, 15g of low-viscosity carboxymethyl cellulose sodium, 3g of XC xanthan gum, 5g of superfine calcium carbonate, and anti-friction solution Clay bag agent 3g, polyacrylamide 0.3g.

[0026] Preparation:

[0027] S1 Weigh 1000mL of water, and add 0.19g of sodium dodecylbenzenesulfonate (AS-12), 0.38g of polyoxyethylene octylphenol ether (OP-10) and 2.43g of saponified oil into the water, at 6000r / Stir for 10 minutes under the condition of stirring at min speed, and mix evenly to prepare 3g of sludging agent;

[0028] S2 Add 50 g of sodium bentonite to the solvent in step S1 under stirring condition of 100 r / min, and stir for 16 h;

[0029] S3 under the stirring condition of 6000r / min rotating speed, add low-viscosity sodium carboxymethylcellulose 15g, XC xanthan gum 3g, superfine calcium carbonate 5g, polyacrylamide 0.3g to th...

Embodiment 2

[0031] A shield mud system suitable for super-large diameter tunnels, prepared from the following raw materials: 1000ml of water, 40g of sodium bentonite, 20g of low-viscosity carboxymethyl cellulose sodium, 2g of XC xanthan gum, 4g of superfine calcium carbonate, and anti-friction solution Clay bag agent 2g, polyacrylamide 0.2g.

[0032] Preparation:

[0033] S1 Weigh 1000mL of water, and add 0.13g of sodium dodecylbenzenesulfonate (AS-12), 0.25g of polyoxyethylene octylphenol ether (OP-10) and 1.63g of saponified oil into the water, at 6000r / Stir for 10 minutes under the condition of stirring at min speed, and mix evenly to prepare 2g of sludging agent;

[0034] S2 Add 40 g of sodium bentonite to the solvent in step S1 under stirring condition of 100 r / min, and stir for 16 h;

[0035] S3 under the stirring condition of 6000r / min rotating speed, add low-viscosity sodium carboxymethylcellulose 20g, XC xanthan gum 2g, superfine calcium carbonate 4g, polyacrylamide 0.2g to th...

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Abstract

The invention provides a shield mud system applicable to an extra-large-diameter tunnel. The shield mud system is prepared from the following raw materials in parts by mass: 100 parts of water, 5 to 6parts of a dispersion film-forming agent, 1 to 2 parts of a filtration-reducing agent, 0.2 to 0.4 part of a viscosity improving agent, 0.4 to 0.6 part of a plugging agent, 0.2 to 0.4 part of an anti-wear and mud ball splitting agent and 0.02 to 0.03 part of a selective flocculating agent. The shield mud system provided by the invention has the beneficial effects that the shield mud system has unique 'lubrication and anti-wear performance' and has the effects of protecting a shield bit tool and improving the footage drilling efficiency; a dense mud film can be formed, the filtration loss amount is reduced and the soil pressure is balanced, so that the stability of a well wall is enhanced, the sticking coefficient can be reduced and a mud ball of the shield bit tool is prevented; and the shield mud system has good rheological performance, filtration-reducing performance and lubricating performance and can meet the requirements of shield mud drilling, and has the advantages of environment protection and low cost.

Description

technical field [0001] The invention relates to the technical field of tunnel shield mud, in particular to a preparation method suitable for a super large diameter tunnel shield mud system. Background technique [0002] The large-diameter tunnel adopts a large-diameter mud-water balance shield. The formations encountered along the tunnel are complex and diverse, including upper-soft and lower-hard composite strata, medium cemented conglomerate with a hardness of up to 40MPa, full-section sandy strata, silt-fine sand, medium-coarse sand and Rock formations such as mudstone and conglomerate. Due to the complex geological conditions, the cut silt and fine sand cuttings and mudstone will cause serious wear and damage to the shield cutting tool, and at the same time, the strongly weathered muddy cemented clay layer will bond the cutter head, causing huge resistance to shield tunneling, and the stability of the tunnel shaft wall, etc. , are all world-class problems encountered in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/24
Inventor 徐晗乌效鸣魏林春王超
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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