Soil improving method for rectangular-pipe jacking construction in gravel soil layer

A technology of rectangular pipe jacking and soil mass, which is applied in the fields of earth drilling, soil protection, infrastructure engineering, etc. It can solve problems such as poor establishment of soil pressure balance, water inrush when crossing the aquifer, and tool wear of the machine head. Achieve the effects of small cohesion, short self-stabilization time, and poor arching effect

Inactive Publication Date: 2015-06-03
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a soil improvement method for rectangular pipe jacking construction in gravel soil stratum, which improves the soil to have good fluidity, low friction angle, medium compressibility, low adhesion and low permeability It can ensure full tank jacking and reasonable jacking construction speed, and can solve problems such as poor establi

Method used

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  • Soil improving method for rectangular-pipe jacking construction in gravel soil layer
  • Soil improving method for rectangular-pipe jacking construction in gravel soil layer
  • Soil improving method for rectangular-pipe jacking construction in gravel soil layer

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Effect test

Embodiment 1

[0023] The invention discloses a soil ballast soil improvement method for multi-cutter earth pressure balance rectangular pipe jacking construction in a round boulder formation, which comprises a PAM solution and a bentonite mud solution. Using sodium-based bentonite mud with a mass concentration of 9%, the concentration of PAM solution at 2g / L, and using different injection ratios of PAM solution and bentonite mud solution, the properties of the improved muck can meet the requirements of rectangular earth pressure balance pipe jacking. Construction, soil improvement effects and performance indicators are shown in Tables 1 and 2 below.

[0024] Table 1 Soil improvement effect index data

[0025]

[0026] Table 2 Performance indicators of original soil and improved muck soil

[0027]

Embodiment 2

[0029] The invention discloses a method for improving the soil body of a soil ballast in a multi-cutter soil pressure balance rectangular pipe jacking construction in a round gravel soil layer, comprising a PAM solution and a bentonite slurry solution. Using sodium-based bentonite mud with a mass concentration of 7%, and a concentration of PAM solution of 4g / L, using different injection ratios of PAM solution and bentonite mud solution, the properties of the improved muck can meet the requirements of rectangular earth pressure balance pipe jacking. Construction, soil improvement effects and performance indicators are shown in Table 3 and Table 4 below.

[0030] Table 3 Soil improvement effect index data

[0031]

[0032] Table 4 Performance indicators of original soil and improved dregs

[0033]

Embodiment 3

[0035] The invention discloses a method for improving the soil body of a soil ballast in a multi-cutter soil pressure balance rectangular pipe jacking construction in a round gravel soil layer, comprising a PAM solution and a bentonite slurry solution. Using sodium-based bentonite mud with a mass concentration of 11%, the concentration of PAM solution is 1g / L, and using different injection ratios of PAM solution and bentonite mud solution, the properties of the improved muck can meet the requirements of rectangular earth pressure balance pipe jacking. Construction, soil improvement effects and performance indicators are shown in Tables 5 and 6 below.

[0036] Table 5 Soil improvement effect index data

[0037]

[0038] Table 6 Performance indicators of original soil and improved muck soil

[0039]

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Abstract

The invention relates to a soil improving method for rectangular-pipe jacking construction in a gravel soil layer. The soil improving method specially includes that a PAM (polyacrylamide) solution and a bentonite mud solution are added to a working surface and the soil body of a soil pressure bin, content of the PAM in the PAM solution ranges from 1g/L to 4g/L, and the mass concentration of the bentonite mud solution ranges from 7% to 11%. The soil body cut with the soil improving method is improved to have the advantages of good fluidity, low frictional angle, middle compressibility, lower adhesivity, low permeability and the like, the full-tank jacking and jacking construction speed are ensured, problems about uneasiness in soil pressure balance construction, severe abrasion of a nose cutter, easiness in 'caking', proneness to 'water gushing' when the nose cutter passes through the water-baring layer and the like can be solved, requirements of the rectangular-pipe jacking construction with the soil pressure balance can be met, and technical support is provided for establishment of dynamic soil pressure balance of the soil-pressure-balance rectangular-pipe jacking working surface of a multicutter in the gravel soil layer.

Description

technical field [0001] The invention relates to the field of underground non-excavation technology, in particular to the construction technology of single cutterhead or multi-cutterhead earth pressure balance rectangular pipe jacking technology, and in particular to a soil improvement method for rectangular pipe jacking construction in gravel soil stratum. Background technique [0002] In recent years, the rectangular earth pressure balance pipe jacking method has been gradually applied to the construction of urban pedestrian underpasses. Using this kind of underground trenchless technology to build underground passages has the advantages of high cross-sectional area utilization rate, shallow buried depth, uninterrupted ground road traffic, avoiding the demolition of various underground pipelines, no noise, and no environmental pollution. It represents the future urban underground The development direction of pedestrian crossing construction technology. At the beginning, th...

Claims

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Application Information

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IPC IPC(8): E02D3/12E21D9/10
Inventor 许有俊文中坤闫履顺白雪光刘忻梅
Owner INNER MONGOLIA UNIV OF SCI & TECH
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