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Tunnel excavation anti-collapse slurry

A technology for tunnel excavation and collapse prevention, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of unstable performance, high filtration loss, jamming, etc. The effect of water absorption and dispersion

Pending Publication Date: 2019-04-19
SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that this most primitive slurry has the functions of carrying cuttings, purifying the tunnel and balancing the formation pressure of the tunnel, but there are also a series of problems such as high filtration loss, unstable performance, and easy surface collapse and machine jamming.

Method used

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  • Tunnel excavation anti-collapse slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: The anti-collapse grout for tunnel excavation in this embodiment is poured on the excavation surface during tunnel shield excavation, so that a mud film is formed on the excavation surface and excavated objects to support the front soil.

[0015] The tunnel excavation anti-slump grout provided by this embodiment for the clay with high sodium content in the excavated soil layer includes non-dispersible polymer liquid, which includes the following components, and the weight percentages of each component are respectively: bentonite is 1.5-2%, hydrolyzed polyacrylamide PHPA is 0.1-0.2%, soda ash Na 2 co 3 3%-4%, polyacrylamide potassium salt K-PAM 0.1-0.2%, anionic surfactant CMC-LV 0.5%-0.6%, hydrolyzed polyacrylonitrile potassium salt KPAN 0.3-0.5%, and the rest water.

[0016] Among them, the molecular weight of hydrolyzed polyacrylamide PHPA is 1 million to 3 million, and the degree of hydrolysis is 30%, which can inhibit the dispersion of suspended soli...

Embodiment 2

[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the soil quality of the excavated soil layer in this embodiment contains clay with high calcium content, and the tunnel excavation anti-collapse slurry provided by it is compared with the implementation The difference of the tunnel excavation anti-collapse slurry in example one is: soda ash Na 2 co 3 5%-7%. This is because, in order to fully prehydrate the bentonite, more soda ash needs to be added to the soil layer with high calcium content than the soil layer with high sodium content to increase the pulping rate, thereby ensuring that the bentonite can improve viscosity and reduce filtration. lost effect.

[0021] When implementing the above-mentioned embodiments: after the anti-collapse liquid for tunnel excavation is configured, the properties of the base slurry should be adjusted to the following ranges: funnel viscosity 20-35s; density 1.02-1.03g / cm 3 ; API filtration loss of 7-15ml, ...

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Abstract

The invention relates to the technical field of tunnel excavation, and especially relates to tunnel excavation anti-collapse slurry. The anti-collapse slurry is characterized in that the anti-collapseslurry includes an undispersed polymer solution which includes, by weight percentage, 1.5-2% of bentonite, 0.1-0.2% of hydrolytic polyacrylamide PHPA, 3-7% of sodium carbonate Na2Co3, 0.1-0.2% of potassium polyacrylamide salt K-PAM, 0.5-0.6% of an anionic surfactant CMC-LV, and 0.3-0.5% of potassium hydrolytic polyacrylonitrile salt KPAN, with the balance being water. The advantages of the slurryare as follows: solid phase content is low; the proportion of submicron particles is low as well; the slurry can selectively perform flocculation, inhibit rock debris to disperse, and significantly accelerate the speed of excavation; the slurry has good rheological properties and low plastic concentration, so that high yield point can be provided; the capability of stabilizing tunnel walls is strong, and the diameter of excavation is regular; a water absorption dispersing effect of rocks can be effectively inhibited; the occurrence of tunnel seepage can be prevented; and low excavation costscan be achieved, and excavation periods can be shortened.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation, in particular to an anti-collapse slurry for tunnel excavation, which can instantly stabilize the mining surface during tunnel excavation, so that the mining surface can achieve the effect of preventing subsidence; this anti-collapse fluid can also make the excavation The grout reaches a balance to reduce the use of grout and save excavation costs; this anti-slump fluid can also keep the discharge indicators within the specified range. Background technique [0002] The earliest mud-water balance shield is to support the front soil by injecting clean water with appropriate pressure into the sealed cabin with a partition in front of the support ring to form a mud film on the excavation surface and excavated objects. And the mud film on the surface of the soil is cut by the large cutter head installed on the front to form a mud-water mixture to form a high-density slurry, which is transpor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/24
CPCC09K8/24C09K8/5083C09K2208/12
Inventor 陈立生赵国强朱继文徐伟忠李怀洪刘雁蜀赵凯
Owner SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD
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