CN103964796B - A kind of shield tunnel simultaneous grouting slurry being applicable to water-rich sand layer - Google Patents
A kind of shield tunnel simultaneous grouting slurry being applicable to water-rich sand layer Download PDFInfo
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- CN103964796B CN103964796B CN201310027380.3A CN201310027380A CN103964796B CN 103964796 B CN103964796 B CN 103964796B CN 201310027380 A CN201310027380 A CN 201310027380A CN 103964796 B CN103964796 B CN 103964796B
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Abstract
A kind of shield tunnel simultaneous grouting slurry being applicable to water-rich sand layer, the weight proportion of its serosity is (kg/m3): slaked lime powder 30 ~ 80, flyash 250 ~ 700, bentonite 50 ~ 120, medium-fine sand 800 ~ 1200, Polystyrene powder 1 ~ 5, silica flour 1 ~ 10, water reducer 1 ~ 6, modifying agent 1 ~ 5, air entraining agent 1 ~ 3, water 260 ~ 340.The present invention has good water-retaining property, water resistant good dispersion, volume contraction is little, density is big, setting time is longer, mould good fluidity, be difficult to plugging, have the features such as anti-vibration liquefaction function, serosity test block age 2～4 days reach undisturbed soil intensity, 28 days ages reached 4MPa, serosity property indices is better than common hardening capacity serosity and existing inert slurry, it is particularly well-suited to rich water sand soil stratum, remarkably productive to shield tunnel control settlement.
Description
Technical field
The present invention relates to a kind of shield tunnel simultaneous grouting slurry being applicable to water-rich sand layer.Belong to shield tunnel construction to build
Build field of material technology.
Background technology
Shield synchronization slip casting technology refers to driving marginal not slurry in limit in shield tunneling process, while section of jurisdiction abjection shield tail,
Under certain grouting pressure, in appropriate injecting paste material pressure injection to shield tail space, because of its can structure void after the wall of filling in time,
So the stratum settlement effect causing control shield-tunneling construction is preferable, and mortar depositing construction is convenient, is widely adopted at present.
The Main Function of shield tunnel construction simultaneous grouting slurry is timely filling shield tail structure void, controls stratum and sinks
Fall, the major control index of serosity is that filling performance is good, setting time is moderate, pumping is good, the intensity of test block of serosity
Ask the highest.For the feature of water-rich sand layer, simultaneous grouting slurry, in addition to having These characteristics, also should have good water-retaining property, resist
Water dispersible is good, mould the features such as good fluidity.The most domestic simultaneous grouting slurry mainly have three kinds: tradition inert slurry,
Single liquid hardening capacity serosity and dual slurry.But these three kinds of serosity are applied in water-rich sand layer and be there are problems, application effect is not
Preferable.Tradition inert slurry is with flyash, bentonite and sand as primary raw material, although good fluidity, it is simple to slip casting, but its shortcoming
Substantially, serosity easily isolates, water resistant bad dispersibility, and later strength is low, and in water-rich sand layer, application can cause serosity to run off seriously, right
Poor in control settlement effect.Single liquid hardening capacity serosity with cement, flyash, bentonite and sand as primary raw material, this kind of serosity
Although early strength is high, but serosity easily isolates, and water resistant dispersibility is the most poor, serosity can be caused equally to run off, and easily block up
Pipe, is not suitable for shield synchronization slip casting in water-rich sand layer equally.Dual slurry with cement, waterglass, flyash, bentonite and sand is
Primary raw material, although this kind of serosity is difficult to isolation, water resistant good dispersion, but Construction control is more complicated, easily blocking slip casting slurry
Pipeline, and pipeline-cleaning is difficult, is unfavorable for long distance construction.
Summary of the invention
It is an object of the invention to the shortcoming overcoming existing shield tunnel simultaneous grouting slurry, it is provided that one is applicable to rich water
The shield synchronous grouting serous fluid of sandy strata, this serosity have good water-retaining property, water resistant good dispersion, be difficult to isolate bleeding rate little
(bleeding rate < 5%), volume contraction little (cubical contraction < 5%), mould good fluidity (initial slump of serosity 24～26cm it
Between, in 3 hours, the slump is not less than 20cm, and in 8 hours, the slump is not less than 16cm；In 6 hours, fluidity is not less than 220mm),
It is difficult to plugging, setting time moderate (8 ~ 14h), the big (> 1.8g/m of density3), be suitable to the features such as long distance delivery, to control settlement
Remarkably productive.Due to its water resistant good dispersion, good water-retaining property, good stability, it is difficult to isolation, is difficult to plugging, the most particularly suitable
Shield tunnel construction in distance water-rich sand layer.
River Bank Stability method is simple, dispensing low cost, serosity system easy to control the quality, has good economic benefit and society's effect
Benefit.This serosity controls according to 24 ~ 26cm with the slump for major control index, the slump, and setting time was according to 8 ~ 14 hours
Control.
The primary raw material component of the shield synchronous grouting serous fluid of the present invention include slaked lime powder, bentonite, flyash, in thin
Sand, Polystyrene powder, silica flour, water, water reducer, modifying agent and air entraining agent.Calx is main with Ca (OH) under water environment2Shape
State exists, it except active can react with flyash, silica flour etc. in addition to, or important coagulated material, can with in serosity
Fine sand grain mutually bond, increase serosity suspension stability.It is solid that flyash generates the hydraulicity with CaO chemical combination under water environment
Body material and CSH colloidal substance, Calx can provide supersaturation Ca (OH)2Environment, participates in same fine coal simultaneously as calcareous material
Activity SiO in ash2And A12O3And the higher Si0 of activity in silica flour2Hydration reaction generate gel, at the bar with the presence of Gypsum Fibrosum
Under part, hydras (drated calcium aluminate) reaction further generates AFt or AFm gel.Add polyamine family macromolecule polymer to increase
Sticky mixture can improve the water-retaining property of serosity, stability and water resistant dispersive property further.
But being because the participation not having cement, the hydration reaction speed in serosity is slower, it is possible to ensure that serosity has longer
Setting time, the intensity of serosity test block is relatively low, and therefore the water resistant good dispersion of serosity, good water-retaining property, good stability, be difficult to
Isolate, be difficult to plugging.
Weight proportion (the kg/m of the shield tunnel simultaneous grouting slurry material of the present invention3) particularly as follows:
Slaked lime powder: 30 ~ 80；Flyash: 250 ~ 700；Bentonite: 50 ~ 120；Medium-fine sand: 800 ~ 1200；Silica flour: 0.5 ~
10；Water reducer: 1 ~ 6；Modifying agent: 1 ~ 5；Air entraining agent: 1 ~ 3；Water: 260 ~ 350.
The weight proportion of slurry material is according to kg/m3Meter: also include Polystyrene powder: 0 ~ 5.
The weight proportion of slurry material is according to kg/m3Meter: four n-pro-pyl zirconates 0 ~ 5.
The weight proportion of slurry material is according to kg/m3Meter: slaked lime powder: 35 ~ 70；Flyash: 500 ~ 650；Bentonite: 60
~100；Medium-fine sand: 900 ~ 1100；Polystyrene powder: 1 ~ 3；Silica flour: 1 ~ 3；Water reducer: 2 ~ 4；Modifying agent: 1.5 ~ 3；Bleed
Agent: 1 ~ 3；Water: 280 ~ 340.
The weight proportion of slurry material is according to kg/m3Meter:
Slaked lime powder: 40 ~ 60；Flyash: 550 ~ 600；Bentonite: 70 ~ 90；Medium-fine sand: 1000 ~ 1050；Polystyrene
Powder: 1.5 ~ 2.5；Four n-pro-pyl zirconates: 1 ~ 3；Silica flour: 2 ~ 3；Water reducer: 2.5 ~ 3；Modifying agent: 2 ~ 2.5；Air entraining agent: 2 ~
2.5；Water: 300 ~ 320.
The weight proportion of slurry material is according to kg/m3Meter:
Slaked lime powder: 60；Flyash: 600；Bentonite: 80；Medium-fine sand: 1000；Polystyrene powder: 3；Four n-pro-pyls
Zirconate: 2；Silica flour: 2；Water reducer: 3；Modifying agent: 2；Air entraining agent: 1；Water: 320.
Described water reducer water-reducing rate 20～30%, described modifying agent is polyamine family macromolecule polymer and Gypsum Fibrosum.
Described slaked lime powder is Ca (OH)2The content slaked lime powder more than 70%, flyash is II grade of flyash, and silica flour is
SILICA FUME.
Described slaked lime powder calcium hydroxide content >=70%, 320 mesh sieve margin≤0.5%, calcium-magnesium content >=70%.Slaked lime
The viscosity of serosity can be increased, improve water-retaining property and water resistant dispersibility, and have certain consolidation.
Described flyash is II grade of ash, and fineness (0.045mm square hole screen tails over) is not more than 20～45%, water content≤5%.Powder
Coal ash is as providing slurry consolidation intensity and regulate the material of serosity setting time, improving workability and the flowing of serosity simultaneously
Property, as active material and slaked lime generation chemical reaction.
Described bentonite is sodio, and 95% passes through 200 mesh sieves, expansion rate 13～30ml/g, after hydrolyzing because of it, can increase
The stability of serosity, simultaneously its distinctive slide effect, improve the sliding capability of serosity to a certain extent, increases pumpability.
Bentonite can slow down the material separation of serosity, reduces bleeding rate, also has certain antiseepage effect.
Described sand is medium-fine sand, modulus of fineness 0.5 ~ 1.5, and clay content < 5%, cross 5mm sieve before using.Sand is conduct in serosity
Casting resin.
Described Polystyrene powder is the polymer synthesized through free radical polycondensation reaction by styrene monomer, and amorphous state is close
Degree 1.04～1.06g/cm3, the Main Function of Polystyrene powder is to adjust intensity after serosity condenses.
Described silica flour is SILICA FUME, is also silicon ash, and its microspheroidal body can play lubrication, and silica flour can be with Calx, fine coal
Ash, Gypsum Fibrosum generation hydration reaction, can improve the water-retaining property of serosity, water resistant dispersibility and viscosity.
Described water reducer water-reducing rate 20～30%, aquation control ability>20h, degree of hydrolysis<30%.Water reducer Main Function is
Diminishing, regulation serosity setting time.
Described modifying agent is Gypsum Fibrosum and polyamine family macromolecule polymer.Modifying agent refers mainly to Gypsum Fibrosum and polyacrylamide, or
Person's polyacrylamide and plaster ratio are the mixture of 1:2-5；Gypsum Fibrosum can be with Calx, flyash, silica flour generation hydration reaction, energy
Improve the water-retaining property of serosity, water resistant dispersibility and viscosity；The Main Function of polyacrylamide is to improve serosity viscosity, flowing
Property and bleeding, the aid pumpability making serosity is good, good water-retaining property.
Described air entraining agent is dodecylbenzene sodium sulfonate, can improve the effects such as bubble chamber film mechanical strength and toughness, make to stir
The air that the process of mixing is brought into forms small and stable bubble and is uniformly distributed in serosity, improves the impermeability of serosity and anti-invades
Erosion property.
Described water is tap water, PH=7, free from extraneous odour.
Each component mixing and stirring by weight ratio under room temperature, feeding sequence is: first throw siccative i.e. sand, Calx,
Bentonite, Polystyrene powder, add flyash and silica flour, siccative stirring 2min while stirring, add total water consumption after mixing thoroughly
50%, stir 2min, add total Water 40% and Gypsum Fibrosum stirring 2min, last 10% water is as regulation water, i.e. basis
The serosity situation mixed out is properly added, between the regulation serosity slump to 24 ~ 26cm.Finally throw in additive stirring to want to satisfied
Ask.The key point mixing slurry is that water to divide 3 additions, mixes while add.
The beneficial effects of the present invention is:
In the present invention, the modifying agent of application is Gypsum Fibrosum and polyamine family macromolecule polymer.Modifying agent refers mainly to Gypsum Fibrosum and poly-third
Acrylamide, Gypsum Fibrosum can improve the water-retaining property of serosity, water resistant dispersibility with Calx, flyash, silica flour generation hydration reaction and glue
Denseness；The Main Function of polyacrylamide is to improve serosity viscosity, mobility and bleeding, the aid pumpability making serosity is good,
Good water-retaining property.
In the present invention, the air entraining agent of application is dodecylbenzene sodium sulfonate, can improve bubble chamber film mechanical strength and toughness etc. and make
With, the air making whipping process bring into forms small and stable bubble and is uniformly distributed in serosity, improves the impermeability of serosity
And corrosion resistance.
The existence of Polystyrene powder is not only advantageous to improve serosity viscosity, mobility and bleeding, is more beneficial for adjusting
The coefficient of thermal expansion and contraction of joint final products so that slip casting is compared with like product after condensation, extreme more resistant to high temperature and low temperature etc.
Temperature, is difficult to craze and transfiguration, and more flexible and toughness so that the shock resistance of final products is more preferable, not easily broken.
In the present invention, four n-pro-pyl zirconates of application are further improves water resistant dispersibility and stability, is conducive to each
Plant stock dispersion to obtain evenly, and add surface activity, allotment and filling process are not likely to produce coalescence and grumeleuse, slurry
The aid pumpability of liquid and dispersive property are more preferable, and make the impermeability of final products and corrosion resistance more preferably.
In the present invention, each material is not the most independent role, and various raw materials cooperate, and creates splendid effect, produces
Product aid pumpability is good, good water-retaining property, and after product solidification, high temperature resistant cryogenic property is good, and shock resistance is more preferable, not easily broken.The present invention produces
Product water resistant good dispersion, good water-retaining property, good stability, be difficult to isolation, be difficult to plugging, suitable popularization and application.
Detailed description of the invention
Below the present invention is carried out further detailed description, be given shield synchronous grouting serous fluid raw material of the present invention assemble than several
Individual specific embodiment.
Embodiment 1
Weight proportion (the kg/m of each raw material components3) it is:
Slaked lime 70；Flyash 600；Bentonite 60；Sand 900；Polystyrene powder 1；Silica flour 2；Water reducer 4；Polypropylene
Amide 1；Gypsum Fibrosum 4；Water 330.
This grout coordinate ratio bleeding rate about 3%, cubical contraction 2%, setting time 8～12 hours, initial slump 24～
Between 26cm, in 3 hours, the slump is not less than 23cm, and in 8 hours, the slump is not less than 19cm, and in 6 hours, fluidity is not less than
230mm。
Described water reducer is commercially available naphthalene water reducer, and described air entraining agent is dodecylbenzene sodium sulfonate.
Embodiment 2
Weight proportion (the kg/m of each raw material components3) it is:
Slaked lime 50；Flyash 500；Bentonite 100；Sand 1100；Polystyrene powder 3；Silica flour 1；Water reducer 3；Poly-third
Acrylamide 1；Gypsum Fibrosum 2；Air entraining agent 1；Water 310；
This grout coordinate ratio bleeding rate about 4%, cubical contraction about 4%, setting time 10～14 hours, initial slump are 24
～between 26cm, in 3 hours, the slump is not less than 22cm, in 6 hours, fluidity is not less than 220mm.
Described water reducer is commercially available naphthalene water reducer, and described air entraining agent is dodecylbenzene sodium sulfonate.
Embodiment 3
Weight proportion (the kg/m of each raw material components3) it is:
Slaked lime 35；Flyash 650；Bentonite 70；Sand 800；Silica flour 1；Water reducer 2；Polyacrylamide 0.5；Gypsum Fibrosum 1；
Four n-pro-pyl zirconates 2；Air entraining agent 2；Water 290；
This grout coordinate ratio bleeding rate about 5%, cubical contraction about 3%, setting time 12～14 hours, initial slump are 24
～between 26cm, in 3 hours, the slump is not less than 23cm, in 6 hours, fluidity is not less than 230mm.
Described water reducer is commercially available naphthalene water reducer, and described air entraining agent is dodecylbenzene sodium sulfonate.
Embodiment 4
Weight proportion (the kg/m of each raw material components3) it is:
Slaked lime powder 60；Flyash 600；Bentonite 80；Medium-fine sand 1000；Polystyrene powder 4；Four n-pro-pyl zirconates
3；Silica flour 2；Water reducer 3；Polyacrylamide 2；Air entraining agent 2；Water 320；
This grout coordinate ratio bleeding rate about 4%, cubical contraction about 2%, setting time 12～15 hours, initial slump are 25
～between 27cm, in 3 hours, the slump is not less than 23cm, in 6 hours, fluidity is not less than 240mm.
The weight proportion of embodiment 5 slurry material is according to kg/m3Meter:
Slaked lime powder: 60kg/m3；Flyash: 600kg/m3；Bentonite: 80kg/m3；Medium-fine sand: 1000kg/m3；Polyphenyl
Ethylene powder: 3kg/m3；Four n-pro-pyl zirconate: 2kg/m3；Silica flour: 2kg/m3；Water reducer: commercially available highly concentrated degree type naphthalene system diminishing
Agent 3kg/m3；Modifying agent: polyacrylamide 1kg/m3；Gypsum Fibrosum 2kg/m3；Air entraining agent dodecylbenzene sodium sulfonate: 1kg/m3；Water:
320kg/m3。
Embodiment 6-15
Proportioning is according to following form, water reducer: commercially available naphthalene water reducer；Modifying agent: polyacrylamide: Gypsum Fibrosum 1:2；Bleed
Agent dodecylbenzene sodium sulfonate.
Claims (3)
1. the shield tunnel simultaneous grouting slurry being applicable to water-rich sand layer, it is characterised in that the weight proportion of slurry material
According to kg/m3Meter:
Slaked lime 50；Flyash 500；Bentonite 100；Sand 1100；Polystyrene powder 3；Silica flour 1；Water reducer 3；Polyacrylamide
Amine 1；Gypsum Fibrosum 2；Air entraining agent 1；Water 310；Described water reducer is commercially available naphthalene water reducer, and described air entraining agent is DBSA
Sodium.
2. the shield tunnel simultaneous grouting slurry being applicable to water-rich sand layer, it is characterised in that the weight proportion of slurry material
According to kg/m3Meter:
Slaked lime 35；Flyash 650；Bentonite 70；Sand 800；Silica flour 1；Water reducer 2；Polyacrylamide 0.5；Gypsum Fibrosum 1；Four just
Propyl zirconate 2；Air entraining agent 2；Water 290；Described water reducer is commercially available naphthalene water reducer, and described air entraining agent is detergent alkylate sulphur
Acid sodium.
3. the shield tunnel simultaneous grouting slurry being applicable to water-rich sand layer, it is characterised in that the weight proportion of slurry material
According to kg/m3Meter:
Slaked lime powder: 60；Flyash: 600；Bentonite: 80；Medium-fine sand: 1000；Polystyrene powder: 3；Four n-pro-pyl zirconic acids
Ester: 2；Silica flour: 2；Water reducer: commercially available highly concentrated degree type naphthalene water reducer 3；Modifying agent: polyacrylamide 1；Gypsum Fibrosum 2；Air entraining agent ten
Dialkyl benzene sulfonic acids sodium: 1；Water: 320.
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104987022A (en) * | 2015-06-11 | 2015-10-21 | 安徽瑞升电气科技集团有限公司 | Cable thermal insulation sealant and preparing method thereof |
| CN107512862B (en) * | 2017-08-08 | 2020-09-04 | 中交武汉港湾工程设计研究院有限公司 | Tackifier special for shield synchronous grouting material |
| CN108793897A (en) * | 2018-09-07 | 2018-11-13 | 中铁十二局集团有限公司 | Suitable for water rich strata shield synchronous grouting serous fluid and preparation method |
| CN109339799B (en) * | 2018-10-26 | 2020-08-18 | 中铁二十二局集团轨道工程有限公司 | Shield construction process for shallow buried section of water-rich sandy gravel stratum |
| CN111393117B (en) * | 2020-03-24 | 2021-08-27 | 中国建筑第五工程局有限公司 | Water-containing undisturbed shield muck baking-free building material and preparation method thereof |
| CN112727503A (en) * | 2021-02-02 | 2021-04-30 | 中建八局轨道交通建设有限公司 | Shield construction slurry applicable to water-rich stratum |
| CN112723836B (en) * | 2021-02-03 | 2022-02-08 | 中国矿业大学(北京) | Shield excavation gap synchronous grouting slurry for water-rich silty soil stratum |
| CN114702291B (en) * | 2022-03-30 | 2023-02-10 | 山西省交通科技研发有限公司 | Grouting material for water inrush and mud inrush in broken tunnel zone and water plugging and reinforcing design method thereof |
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| CN101575196A (en) * | 2009-06-01 | 2009-11-11 | 上海市第二市政工程有限公司 | Shield synchronous grouting slurry |
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| JPH11349942A (en) * | 1998-04-10 | 1999-12-21 | Mitsui Chem Inc | Agent for improving ground consolidation and suspension type grout agent and ground improvement using the same |
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| CN101545320A (en) * | 2008-03-25 | 2009-09-30 | 宝山钢铁股份有限公司 | Method for compensation and anti-permeation of temperature difference cracks of ground concrete high-temperature pool |
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