CN109469039A - The method that Nano silica sol rapid osmotic reinforces sand under microfibre humidification - Google Patents
The method that Nano silica sol rapid osmotic reinforces sand under microfibre humidification Download PDFInfo
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- CN109469039A CN109469039A CN201811339006.6A CN201811339006A CN109469039A CN 109469039 A CN109469039 A CN 109469039A CN 201811339006 A CN201811339006 A CN 201811339006A CN 109469039 A CN109469039 A CN 109469039A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mining & Mineral Resources (AREA)
- Soil Sciences (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Agronomy & Crop Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Silicon Compounds (AREA)
Abstract
The invention discloses the methods that Nano silica sol rapid osmotic under a kind of microfibre humidification reinforces sand, in order to improve formation Silica hydrogel-sand complex intensity after Nano silica sol rapid osmotic sand sample, wood fibre is dispersed in Nano silica sol, Nano silica sol rapid osmotic sand is then formed into Silica hydrogel-sand complex.The present invention, which gives, solidifies the sample formula that deviatoric stress peak value changes with confining pressure and wood fibre concentration in triaxial test.
Description
Technical field
The invention belongs to Nano silica sol under geotechnical study field more particularly to a kind of microfibre humidification is quick
The method of penetration reinforcement sand.
Background technique
Saturation loosening sand ground can liquefy under seismic loading, macroscopically show as soil body pore water pressure
Power rises, while effective contact stress of soil body solid phase is zero, and at this moment soil mass property is similar to fluid and loses shearing strength.Ground
Shake liquefaction causes following harm: floating such as inclined building, settlement of foundation, subway tunnel, road foundation sliding.It therefore can be with
Consideration prevents from liquefying by soil mass consolidation, such as silicon sol solution is passed through in the liquefiable soil body, left floating in silicon sol solution
Nano particle, these nano particles are first gradually condensed into chain structure and then form the gel of tridimensional network, this Silica hydrogel
System can be with cementing sand grains to reinforce sand and prevent from liquefying.
But from terms of the scanning electron microscope of Silica hydrogel, Silica hydrogel has a large amount of microcrack between sand particle, these microcracks are reduced
Silica hydrogel-sand complex intensity works as nano-silicon it can be considered to mix wood fibre into Nano silica sol in this way
After colloidal sol is converted into Silica hydrogel, wood fibre carries out enhancing to Silica hydrogel to reduce the extension of microcrack, ultimately increases silicon
Gel-sand complex intensity.And during Nano silica sol penetration reinforcement sand, pass through the indoor examination of inventor's progress
It issues after examination and approval now, wood fibre volume is very few, and it is unobvious to improve Silica hydrogel-sand complex intensity effect；If wood fibre volume mistake
More, Silica hydrogel-sand complex intensity has decreasing trend, it is therefore desirable to which a kind of optimal wood fibre volume makes mixed with wooden fibre
The nano silicasol sol solution of dimension can quickly infiltrate sand and can effectively reinforce sand.
Summary of the invention
It is an object of the invention to form Silica hydrogel-sand complex after improving Nano silica sol rapid osmotic sand sample
Intensity, the present invention provide a kind of method that Nano silica sol rapid osmotic reinforces sand under microfibre humidification.
Technical solution of the present invention: being put into alkaline nano silica solution in the first container, and then instilling acid makes alkaline nano
Silica solution becomes acid, and dry wood fibre is then added and is dispersed in wood fibre in Nano silica sol, finally
By water pump will be mixed with acetic acid and wood fibre Nano silica sol inject sand in, wait Nano silica sol formed gel to
Soil mass consolidation, the mass percent of silica dioxide granule is 10%~40% in the Nano silica sol, and the wood fibre accounts for
The mass percent of Nano silica sol is 0.01%~0.05%.
Preferably, the alkaline nano silicon sol solution is that nanoscale silica dioxide granule is dispersed in sodium hydroxide solution
In, the partial size of silica dioxide granule is 10~20nm.
Preferably, the wood fibre length is less than 1mm, and density is 1.3~1.5g/cm3。
Preferably, the instillation acid makes alkaline nano silica solution become acid, refer to instill acetic acid to adjust pH value to
5.0-5.5。
Preferably, it is that will be mixed with receiving for acetic acid and wood fibre that wood fibre, which is dispersed in the method in Nano silica sol,
Rice silica solution stirs 60 minutes.Here the method stirred can choose as magnetic agitation, i.e., the bottom in container places first
Magnet strip, and the second magnet strip is placed in the lower section outside container bottom, the second magnet strip is connected with motor, uses motor drive
The rotation of second magnet strip, the first magnet strip rotate under the action of the second magnet strip magnetic field, and such first magnet strip is holding
Nano silica sol is stirred in device.
Preferably, the mass percent of silica dioxide granule is 20% in Nano silica sol, and wood fibre accounts for nano silicasol
The mass percent of glue is 0.03%, i.e., wood fibre concentration is 0.03%.Wood fibre concentration is excessive, leads to wood fibre
The difficulties in dispersion in Nano silica sol, pockets of wood fibre is filtered by sand when so as to cause nano silicasol glue penetration sand,
And the agglomerating wood fibre not dispersed increases the defects of Silica hydrogel, eventually leads to the strength reduction for solidifying sand.
In order in the case where given wood fibre concentration and horizontal direction confining pressure, quickly determine that the deviatoric stress peak value of sample is strong
Degree provides the formula that deviatoric stress peak strength changes with wood fibre concentration and horizontal direction confining pressure, is defined as follows variable first:
σ1: axial collapse stress in triaxial test
σ3: horizontal direction confining pressure
σdeviator: deviatoric stress peak strength takes σdeviator=σ1-σ3
X: wood fibre percentage
C: cohesive strength
Internal friction angle
WithCoefficient in cohesive strength and fibre concentration relation formula
WithCoefficient in internal friction angle and fibre concentration relation formula
If axial collapse stress is σ in triaxial test1, horizontal direction confining pressure is σ3If deviatoric stress peak strength is σdeviator,
Seek σdeviatorFormula are as follows:
σdeviator=σ1-σ3 (1)
In (1) formula, seeking axial collapse stress in triaxial test is σ1Formula are as follows:
In (2) formula, c is cohesive strength,For internal friction angle, and cohesive strength c and internal friction angleIt is all fibre concentration percentage
The function of ratio, σ3To specify confining pressure, therefore only it is to be understood that fibre concentration percentage is assured that cohesive strength and internal friction angle, so
Combine confining pressure can be in the hope of axial collapse stress σ afterwards1；
If x is wood fibre percentage, such as x takes 0.01 to show that wood fibre percentage is 0.01%；
If cohesive strength c is x function, and is setWithFor the coefficient in function, have:
If internal friction angleFor x function, and setWithFor the coefficient in function, have:
Therefore, in the case where known wood fibre concentration x, can be calculated by formula (3) and formula (4) cohesive strength c and
Internal friction angleThen by cohesive strength c and internal friction angleAnd known horizontal direction confining pressure σ3Substitution formula acquires axial direction after (2)
Bursting stress is σ1, finally by σ1And σ3Substitution formula (1) obtains deviatoric stress peak strength σdeviator。
The beneficial effects of the invention are as follows the micro-crack extension in Silica hydrogel is reduced by addition wood fibre, received to increase
Rice silica solution rapid osmotic reinforces the intensity of sand, and The present invention gives wood fibres to account for the excellent of Nano silica sol mass percent
Change value, so that wood fibre be made to play the role of enhancing Silica hydrogel-sand complex intensity.
Detailed description of the invention
Fig. 1 is integral assembling structure schematic diagram of the invention；
Fig. 2 is magnetic agitation schematic diagram of the invention；
Fig. 3 is to obtain sample deviatoric stress peak strength when confining pressure is 50kPa based on triaxial test to become with wood fibre concentration
Change curve；
Fig. 4 is to propose that formula obtains sample deviatoric stress peak strength when confining pressure is 50kPa with wooden fibre based on the present invention
Tie up the simulation curve of concentration variation
1. the first containers, 2. Nano silica sols, 3. first magnet strips, 4. second magnet strips, 5. motor, 6. water in figure
The molding die that pump, 7. sands, 8. solidify sand sample
Specific embodiment
In order to realize the present invention technological means, character of innovation, reach purpose and effect is easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is further explained.
Alkaline nano silica solution 2 is put into the first container 1, then instilling acid makes alkaline nano silica solution 2 become acid,
Then dry wood fibre is added and is dispersed in wood fibre in Nano silica sol 2, will be mixed with finally by water pump 6
The Nano silica sol 2 of acetic acid and wood fibre injects in sand 7, waits the formation gel of Nano silica sol 2 to reinforce sand 7,
The mass percent of silica dioxide granule is 10%~40% in the Nano silica sol, and the wood fibre accounts for Nano silica sol
Mass percent be 0.01%~0.05%.
For example, solidifying sand sample material therefor to carry out triaxial test are as follows: the alkaline nano silicon sol solution is
Nanoscale silica dioxide granule is dispersed in sodium hydroxide solution, and the partial size of silica dioxide granule is 10~20nm, nano-silicon
The mass percent of silica dioxide granule is 20% in colloidal sol；The wood fibre length is less than 1mm, and density is 1.3~1.5g/
cm3, the mass percent that wood fibre accounts for Nano silica sol is taken as 0.01%, 0.02%, 0.03%, 0.04% and respectively
0.05%, thus the solidification sand sample under 5 kinds of production different wood fibre concentration；
A kind of sample making course for solidifying sand sample for triaxial test are as follows: instilling acid becomes alkaline nano silica solution
Acidity, such as acetic acid is instilled to adjust pH value to 5.0-5.5；Then wood fibre is dispersed in Nano silica sol,
The Nano silica sol that acetic acid and wood fibre will be mixed with stirs 60 minutes, and the method for stirring is magnetic agitation, i.e., as shown in Figure 2
The first magnet strip 3 is placed in bottom in the first container 1, and the second magnet strip 4 is placed in the lower section outside 1 bottom of the first container,
Second magnet strip 4 and motor 5 connect, and drive the rotation of the second magnet strip 4 with motor 5, the first magnet strip 3 is in the second magnet strip
It is rotated under the action of 4 magnetic fields, such first magnet strip 3 is stirred Nano silica sol in the first container 1；Finally such as
The Nano silica sol 2 for being mixed with acetic acid and wood fibre is injected in sand 7 by water pump 6 shown in Fig. 1, waits Nano silica sol 2
Gel is formed to reinforce sand 7；
By triaxial test, the deviatoric stress peak strength for obtaining solidifying sand is with the change curve of wood fibre concentration, such as
When confining pressure shown in Fig. 3 is 50kPa, the deviatoric stress peak strength of sample is maximum when the concentration of wood fibre is 0.03%.
The formula that deviatoric stress peak strength changes with wood fibre concentration and horizontal direction confining pressure is proposed, thus wooden giving
In the case where fibre concentration and horizontal direction confining pressure, the deviatoric stress peak strength of sample can be quickly determined.It is defined as follows change first
Amount:
σ1: axial collapse stress in triaxial test
σ3: horizontal direction confining pressure
σdeviator: deviatoric stress peak strength takes σdeviator=σ1-σ3
X: wood fibre percentage
C: cohesive strength
Internal friction angle
WithCoefficient in cohesive strength and fibre concentration relation formula
WithCoefficient in internal friction angle and fibre concentration relation formula
If axial collapse stress is σ in triaxial test1, horizontal direction confining pressure is σ3If deviatoric stress peak strength is σdeviator,
Seek σdeviatorFormula are as follows:
σdeviator=σ1-σ3 (1)
In (1) formula, seeking axial collapse stress in triaxial test is σ1Formula are as follows:
In (2) formula, c is cohesive strength,For internal friction angle, and cohesive strength c and internal friction angleIt is all fibre concentration percentage
The function of ratio, σ3To specify confining pressure, therefore only it is to be understood that fibre concentration percentage is assured that cohesive strength and internal friction angle, so
Combine confining pressure can be in the hope of axial collapse stress σ afterwards1；
If x is wood fibre percentage, such as x takes 0.01 to show that wood fibre percentage is 0.01%；
If cohesive strength c is x function, and is setWithFor the coefficient in function, have:
If internal friction angleFor x function, and setWithFor the coefficient in function, have:
Therefore, in the case where known wood fibre concentration x, can be calculated by formula (3) and formula (4) cohesive strength c and
Internal friction angleThen by cohesive strength c and internal friction angleAnd known horizontal direction confining pressure σ3Substitution formula acquires axial direction after (2)
Bursting stress is σ1, finally by σ1And σ3Substitution formula (1) obtains deviatoric stress peak strength σdeviator。
Fig. 4 is to obtain deviatoric stress peak strength when confining pressure is 50kPa based on formula (1)~(4) simulation to become with wood fibre concentration
Change curve, Fig. 4 determines the coefficient in formula (3)WithAnd the coefficient in formula (4)
WithIt is respectively as follows:
It can be seen that the test result of Fig. 3 and the analog result of Fig. 4 are consistent on curve form, and all wooden
Fibre concentration reaches maximum value when being 0.03%.
Claims (7)
1. a kind of method that Nano silica sol rapid osmotic reinforces sand under microfibre humidification, it is characterised in that: first
Alkaline nano silica solution is put into container, then instilling acid makes alkaline nano silica solution become acid, and dry wood is then added
Matter fiber is simultaneously dispersed in wood fibre in Nano silica sol, will be mixed with receiving for acetic acid and wood fibre finally by water pump
In rice silica solution injection sand, Nano silica sol is waited to form gel to soil mass consolidation, titanium dioxide in the Nano silica sol
The mass percent of silicon particle be 10%~40%, the wood fibre account for Nano silica sol mass percent be 0.01%~
0.05%.
2. Nano silica sol rapid osmotic reinforces the side of sand under a kind of microfibre humidification according to claim 1
Method, it is characterised in that: the alkaline nano silicon sol solution is that nanoscale silica dioxide granule is dispersed in sodium hydroxide solution
In, the partial size of silica dioxide granule is 10~20nm.
3. Nano silica sol rapid osmotic reinforces the side of sand under a kind of microfibre humidification according to claim 1
Method, it is characterised in that: the wood fibre length is less than 1mm, and density is 1.3~1.5g/cm3。
4. Nano silica sol rapid osmotic reinforces the side of sand under a kind of microfibre humidification according to claim 1
Method, it is characterised in that: the instillation acid makes alkaline nano silica solution become acid, refers to and instills acetic acid to adjust pH value to 5.0-
5.5。
5. Nano silica sol rapid osmotic reinforces the side of sand under a kind of microfibre humidification according to claim 1
Method, it is characterised in that: it is that will be mixed with receiving for acetic acid and wood fibre that wood fibre, which is dispersed in the method in Nano silica sol,
Rice silica solution stirs 60 minutes, and the method stirred here can choose as magnetic agitation, i.e., the bottom in container places first
Magnet strip, and the second magnet strip is placed in the lower section outside container bottom, the second magnet strip is connected with motor, uses motor drive
The rotation of second magnet strip, the first magnet strip rotate under the action of the second magnet strip magnetic field, and such first magnet strip is holding
Nano silica sol is stirred in device.
6. Nano silica sol rapid osmotic reinforces the side of sand under a kind of microfibre humidification according to claim 1
Method, it is characterised in that: the mass percent of silica dioxide granule is 20% in Nano silica sol, and wood fibre accounts for Nano silica sol
Mass percent be 0.03%.
7. Nano silica sol rapid osmotic reinforces the side of sand under a kind of microfibre humidification according to claim 1
Method, it is characterised in that: provide the formula that deviatoric stress peak strength changes with wood fibre concentration and horizontal direction confining pressure, define first
Following variable:
σ1: axial collapse stress in triaxial test
σ3: horizontal direction confining pressure
σdeviator: deviatoric stress peak strength takes σdeviator=σ1-σ3
X: wood fibre percentage
C: cohesive strength
Internal friction angle
WithCoefficient in cohesive strength and fibre concentration relation formula
WithCoefficient in internal friction angle and fibre concentration relation formula
If axial collapse stress is σ in triaxial test1, horizontal direction confining pressure is σ3If deviatoric stress peak strength is σdeviator, ask
σdeviatorFormula are as follows:
σdeviator=σ1-σ3 (1)
In (1) formula, seeking axial collapse stress in triaxial test is σ1Formula are as follows:
In (2) formula, c is cohesive strength,For internal friction angle, and cohesive strength c and internal friction angleIt is all fibre concentration percentage
Function, σ3To specify confining pressure, therefore only it is to be understood that fibre concentration percentage is assured that cohesive strength and internal friction angle, then tie
Surrounding pressure can be in the hope of axial collapse stress σ1；
If x is wood fibre percentage；
If cohesive strength c is x function, and is setWithFor the coefficient in function, have:
If internal friction angleFor x function, and setWithFor the coefficient in function, have:
Therefore, in the case where known wood fibre concentration x, cohesive strength c and Nei Mo can be calculated by formula (3) and formula (4)
Wipe angleThen by cohesive strength c and internal friction angleAnd known horizontal direction confining pressure σ3Substitution formula acquires axial collapse after (2)
Stress is σ1, finally by σ1And σ3Substitution formula (1) obtains deviatoric stress peak strength σdeviator。
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Cited By (5)
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| CN113008676A (en) * | 2021-03-01 | 2021-06-22 | 浙江科技学院 | Detection method of silica sol reinforced sandy soil |
| CN113008674A (en) * | 2021-03-01 | 2021-06-22 | 浙江科技学院 | Rapid detection method for crushing of loaded sand particle aggregate |
| CN113155612A (en) * | 2021-04-16 | 2021-07-23 | 浙江科技学院 | Deformation prediction method for microfiber mixed silica sol solidified calcareous sand |
| CN115383971A (en) * | 2022-08-29 | 2022-11-25 | 浙江科技学院 | Silica sol seepage curing sandy soil piezoresistance forming device and method |
| CN115476423A (en) * | 2022-08-29 | 2022-12-16 | 浙江科技学院 | Self-sensing sample forming method for seepage solidified sandy soil |
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