CN111116106B - Composite grouting slurry mixing proportion design method - Google Patents
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- CN111116106B CN111116106B CN201911021253.6A CN201911021253A CN111116106B CN 111116106 B CN111116106 B CN 111116106B CN 201911021253 A CN201911021253 A CN 201911021253A CN 111116106 B CN111116106 B CN 111116106B
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N1/36—Embedding or analogous mounting of samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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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- 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
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- C04B2111/00991—Uses not provided for elsewhere in C04B2111/00 for testing
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/36—Embedding or analogous mounting of samples
- G01N2001/366—Moulds; Demoulding
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0025—Shearing
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Abstract
The invention discloses a composite grouting slurry mix proportion design method for soft foundation treatment in the field of highway subgrade, wherein three different slurries are configured in the slurry mix proportion design process, the three different slurries are respectively tested and compared under the age of 1d, 3d and 7d, and the final design mass mix proportion is selected after the test comparison. The invention has the following advantages: the water glass is used as an accelerating agent to accelerate solidification, so that the final setting time of the composite slurry is reduced, and the composite foundation is rapidly cured and formed; the calcium chloride is used as an early strength agent to improve the early strength of the composite foundation and accelerate the construction progress; compared with cement-water glass slurry, the composite slurry can obviously increase the plasticity of the composite foundation, reduce the brittle failure of the composite foundation, ensure the stability of the composite foundation, has the characteristics of environmental protection and no pollution, has good economic benefit, and can save a large amount of engineering funds; the slurry has high bearing capacity of the composite foundation formed by treating the soft foundation, eliminates the liquefaction phenomenon and can meet the bearing capacity requirement of the highway foundation.
Description
Technical Field
The invention relates to the field of highway construction, in particular to a design method of a composite grouting slurry mixing proportion.
Background
Due to the impact sedimentation effect of river water, silt soft base layers are widely distributed in China along river regions, and the silt layer has the characteristics of high underground water level, large buried depth, thick covering layer, low bearing capacity and easiness in liquefaction.
Along with the great development of road traffic, a lot of road construction needs to pass through the soft base band, the current treatment schemes aiming at the soft base are mostly engineering measures such as cofferdam dredging, rubble squeezing, single cement-based material powder shotcrete, cement-water glass grouting and the like, and the slurry mixing ratio is an important factor influencing the grouting reinforcement effect, so the slurry mixing ratio design aims at determining the most economical cement slurry mixing ratio under the premise condition of meeting the technical indexes and the standard requirements.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a composite grouting slurry mixing ratio design method.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention relates to a composite grouting slurry mix proportion design method, which comprises the following steps:
A. taking an undisturbed silt material, cement, water glass and calcium chloride as raw materials, firstly determining the natural water content of a soil sample, then air-drying and crushing the soil, sieving the ground soil by a 5mm sieve, and measuring the water content of the air-dried soil;
B. determining three different cement mixing ratios which are respectively 5%, 2.5% and 1.5% of the mass of the undisturbed soil;
C. selecting a water-cement ratio of 1:1, wherein the water-glass mixing ratio is 4% of the mass of the cement, and the calcium chloride mixing ratio is 1% of the mass of the cement;
D. preparing slurry with three different cement doping ratios, wherein the slurry with the three different cement doping ratios meets the condition of good slurry fluidity, and in the process of preparing the slurry, firstly, uniformly mixing cement and air-dried silt, then uniformly stirring water glass, calcium chloride and water to prepare a gelling liquid, adding the gelling liquid once or gradually, stirring the gelling liquid to be uniform from the time of adding the gelling liquid, wherein the stirring time is not less than 5min, and after the uniform stirring, filling the mixture into a test mold for molding to prepare a standard sample;
E. placing the sample into a standard curing box for curing according to the standard requirements, and respectively carrying out three times of unconfined compression tests and shear tests on slurry samples with three different cement mixing ratios at the ages of 1d, 3d and 7 d;
F. according to the analysis of test results of unconfined compression test and shear test, the change relationship of the internal friction angle with age and mixing ratio is not obvious; the cohesive force can be increased along with the increase of the cement mixing ratio, the change of the 7d age is obvious, the maximum increase is nearly two times, along with the increase of the cement mixing ratio, the unconfined compressive strength of a test piece is enhanced, and simultaneously the unconfined compressive strength of the test piece is increased along with the extension of the maintenance period, so that according to the test result and the engineering economy requirement, the scheme that the cement mixing ratio is 2.5 wt% is adopted, namely the final design quality mixing ratio is selected as follows: undisturbed soil: cement: water glass: calcium chloride 400: 10: 0.4:0.1, and the water-glue ratio is 1: 1.
As a preferred technical scheme of the invention, the cube test piece with the size of 7.07cm is adopted in the direct shear test, the ring cutter test piece with the diameter of 6.18cm and the height of 2cm is adopted in the ring cutter test piece, the mould is removed after 24h of the ring cutter test piece, cement soil on the outer side and two ends of the ring cutter is removed after the mould is removed, the test piece is taken out of the ring cutter, the unrestricted test piece is required to be kept stand for 48h and then is removed, the test piece is placed in a standard maintenance box for maintenance, the interval between the test pieces is not less than 10mm, and the water surface is not less than 20mm higher than the surface of the test piece.
Compared with the prior art, the invention has the following beneficial effects:
1. the water glass is used as an accelerating agent to accelerate solidification, so that the final setting time of the composite slurry is reduced, and the composite foundation is rapidly cured and formed; the calcium chloride is used as an early strength agent to improve the early strength of the composite foundation. The next construction procedure is not influenced, and the construction progress is accelerated;
2. compared with cement-water glass slurry, the composite slurry can obviously increase the plasticity of the composite foundation, reduce the brittle failure of the composite foundation and ensure the stability of the composite foundation;
3. the silty soft soil is used as a base material and is mixed with the composite slurry to react to form a composite foundation, so that the composite foundation is not required to be removed, the environment-friendly and pollution-free characteristic is realized, the construction progress is fast, and the construction period is shortened;
4. the composite slurry has the advantages of wide raw material source, low price, good economic benefit and capability of saving a large amount of engineering funds;
5. the slurry has high bearing capacity of the composite foundation formed by treating the soft foundation, eliminates the liquefaction phenomenon and can meet the bearing capacity requirement of the highway foundation.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of a process framework of the present invention;
FIG. 2 is a graph showing the results of the unconfined compression test at age 1 d;
FIG. 3 is a graph showing the results of the unconfined compressive test at age 3 d;
FIG. 4 is a graph showing the results of the unconfined compression test at age 7 d;
FIG. 5 is a table of values of internal friction angle and internal cohesion after shear test fitting;
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
As shown in fig. 1-5, the invention provides a design method of composite grouting slurry mix proportion, comprising the following steps:
A. taking an undisturbed silt material, cement, water glass and calcium chloride as raw materials, firstly determining the natural water content of a soil sample, then air-drying and crushing the soil, sieving the ground soil by a 5mm sieve, and measuring the water content of the air-dried soil;
B. determining three different cement mixing ratios which are respectively 5%, 2.5% and 1.5% of the mass of the undisturbed soil;
C. selecting a water-cement ratio of 1:1, wherein the water-glass mixing ratio is 4% of the mass of the cement, and the calcium chloride mixing ratio is 1% of the mass of the cement;
D. preparing slurry with three different cement doping ratios, wherein the slurry with the three different cement doping ratios meets the condition of good slurry fluidity, and in the process of preparing the slurry, firstly, uniformly mixing cement and air-dried silt, then uniformly stirring water glass, calcium chloride and water to prepare a gelling liquid, adding the gelling liquid once or gradually, stirring the gelling liquid to be uniform from the time of adding the gelling liquid, wherein the stirring time is not less than 5min, and after the uniform stirring, filling the mixture into a test mold for molding to prepare a standard sample;
E. placing the sample into a standard curing box for curing according to the standard requirements, and respectively carrying out three times of unconfined compression tests and shear tests on slurry samples with three different cement mixing ratios at the ages of 1d, 3d and 7 d;
F. according to the analysis of test results of unconfined compression test and shear test, the change relationship of the internal friction angle with age and mixing ratio is not obvious; the cohesive force can be increased along with the increase of the cement mixing ratio, the change of the 7d age is obvious, the maximum increase is nearly two times, along with the increase of the cement mixing ratio, the unconfined compressive strength of a test piece is enhanced, and simultaneously the unconfined compressive strength of the test piece is increased along with the extension of the maintenance period, so that according to the test result and the engineering economy requirement, the scheme that the cement mixing ratio is 2.5 wt% is adopted, namely the final design quality mixing ratio is selected as follows: undisturbed soil: cement: water glass: calcium chloride 400: 10: 0.4:0.1, and the water-glue ratio is 1: 1.
As a preferred technical scheme of the invention, the cube test piece with the size of 7.07cm is adopted in the direct shear test, the ring cutter test piece with the diameter of 6.18cm and the height of 2cm is adopted in the ring cutter test piece, the mould is removed after 24h of the ring cutter test piece, cement soil on the outer side and two ends of the ring cutter is removed after the mould is removed, the test piece is taken out of the ring cutter, the unrestricted test piece is required to be kept stand for 48h and then is removed, the test piece is placed in a standard maintenance box for maintenance, the interval between the test pieces is not less than 10mm, and the water surface is not less than 20mm higher than the surface of the test piece.
Specifically, the composite foundation meeting the standard bearing capacity requirement is formed by a series of physical and chemical reactions among the curing materials of cement, sodium silicate and calcium chloride and the reinforced silt, and the main curing effects are as follows: the hydrolysis and hydration reaction of the solidified material generates soluble hydrate to provide solidified base; the surface of the silt particle and the solidified base generate a large amount of structural cement through the actions of ion exchange, aggregation and hard coagulation; the cement wraps the silt particles to further form a solidified stone body, so that a high-strength and low-compressibility composite foundation meeting the roadbed strength requirement is formed on the silt layer, the effect of reinforcing a soft foundation is achieved, an unconfined compression test is a main method of the strength test standard in engineering, the test procedure is mature, the operation normalization is strong, and the influence of the composite slurry matching ratio on the strength of a test piece is discussed through the summary of the test; the shear test is an important method for determining the shear strength index of a soil body in engineering, the influence of the shear strength parameter cohesive force and the internal friction angle of the composite slurry matching ratio is discussed through summarizing the test, and the change relation of the internal friction angle with the age and the mixing ratio is not obvious according to the analysis of the test result; the cohesive force can be increased along with the increase of the cement mixing ratio, the change of the 7d age is obvious, and the maximum increase is nearly two times. Along with the improvement of the cement mixing ratio, the unconfined compressive strength of the test piece is enhanced, meanwhile, the unconfined compressive strength of the test piece is increased along with the extension of the maintenance period, when the cement mixing ratio is 5%, the bearing capacity of the composite foundation in the 1d maintenance period reaches 290kpa, the requirement of the standard on the bearing capacity of the foundation of the highway subgrade is met, the bearing capacity of the composite foundation in the 2.5% mixing amount reaches 150kpa after the 7d maintenance period, the strength requirement of the standard is also met, the strength of the composite foundation in the 1.5% mixing amount is also increased along with the extension of the maintenance period, but the overall strength still cannot reach the requirement of the standard, and therefore, the scheme that the cement mixing ratio is 2.5 wt% is adopted according to the test result and the engineering economy requirement.
Compared with the prior art, the invention has the following beneficial effects:
1. the water glass is used as an accelerating agent to accelerate solidification, so that the final setting time of the composite slurry is reduced, and the composite foundation is rapidly cured and formed; the calcium chloride is used as an early strength agent to improve the early strength of the composite foundation. The next construction procedure is not influenced, and the construction progress is accelerated;
2. compared with cement-water glass slurry, the composite slurry can obviously increase the plasticity of the composite foundation, reduce the brittle failure of the composite foundation and ensure the stability of the composite foundation;
3. the silty soft soil is used as a base material and is mixed with the composite slurry to react to form a composite foundation, so that the composite foundation is not required to be removed, the environment-friendly and pollution-free characteristic is realized, the construction progress is fast, and the construction period is shortened;
4. the composite slurry has the advantages of wide raw material source, low price, good economic benefit and capability of saving a large amount of engineering funds;
5. the slurry has high bearing capacity of the composite foundation formed by treating the soft foundation, eliminates the liquefaction phenomenon and can meet the bearing capacity requirement of the highway foundation.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A composite grouting slurry mixing proportion design method is characterized by comprising the following steps:
A. taking an undisturbed silt material, cement, water glass and calcium chloride as raw materials, firstly determining the natural water content of a soil sample, then air-drying and crushing the soil, sieving the ground soil by a 5mm sieve, and measuring the water content of the air-dried soil;
B. determining three different cement mixing ratios which are respectively 5%, 2.5% and 1.5% of the mass of the undisturbed soil;
C. selecting a water-cement ratio of 1:1, wherein the water-glass mixing ratio is 4% of the mass of the cement, and the calcium chloride mixing ratio is 1% of the mass of the cement;
D. preparing slurry with three different cement doping ratios, wherein the slurry with the three different cement doping ratios meets the condition of good slurry fluidity, and in the process of preparing the slurry, firstly, uniformly mixing cement and air-dried silt, then uniformly stirring water glass, calcium chloride and water to prepare a gelling liquid, adding the gelling liquid once or gradually, stirring the gelling liquid to be uniform from the time of adding the gelling liquid, wherein the stirring time is not less than 5min, and after the uniform stirring, filling the mixture into a test mold for molding to prepare a standard sample;
E. placing the sample into a standard curing box for curing according to the standard requirements, and respectively carrying out three times of unconfined compression tests and shear tests on slurry samples with three different cement mixing ratios at the ages of 1d, 3d and 7 d;
F. according to the analysis of test results of unconfined compression test and shear test, the change relationship of the internal friction angle with age and mixing ratio is not obvious; the cohesive force can be increased along with the increase of the cement mixing ratio, the change of the 7d age is obvious, the maximum increase is nearly two times, along with the increase of the cement mixing ratio, the unconfined compressive strength of a test piece is enhanced, and simultaneously the unconfined compressive strength of the test piece is increased along with the extension of the maintenance period, so that according to the test result and the engineering economy requirement, the scheme that the cement mixing ratio is 2.5 wt% is adopted, namely the final design quality mixing ratio is selected as follows: undisturbed soil: cement: water glass: calcium chloride 400: 10: 0.4:0.1, and the water-glue ratio is 1: 1.
2. The method for designing the mix proportion of the composite grouting slurry according to claim 1, wherein the size of the test piece for the unconfined test is a cubic test piece with the size of 7.07cm, the direct shear test is a cutting ring test piece with the diameter of 6.18cm and the height of 2cm, the cutting ring test piece is demoulded after 24h, cement soil on the outer side and two ends of the cutting ring is removed after the demould, the test piece is taken out of the cutting ring, the model of the unconfined test piece is removed after the test piece is kept still for 48h, the test piece is placed in a standard maintenance box for maintenance, the interval between the test pieces is not less than 10mm, and the water surface is not less than 20mm higher than the surface of the test piece.
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| CN102030508B (en) * | 2010-11-24 | 2013-02-13 | 潘林有 | Muddy soil cement grout applied to vertical shaft part of pedestrian underpass in saturated soft clay region |
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