CN114508089A - Construction method for reinforcing soft soil foundation by geopolymer - Google Patents
Construction method for reinforcing soft soil foundation by geopolymer Download PDFInfo
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- 229920000876 geopolymer Polymers 0.000 title claims abstract description 86
- 239000002689 soil Substances 0.000 title claims abstract description 78
- 238000010276 construction Methods 0.000 title claims abstract description 52
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 36
- 238000012360 testing method Methods 0.000 claims abstract description 51
- 239000002994 raw material Substances 0.000 claims abstract description 49
- 238000013461 design Methods 0.000 claims abstract description 28
- 230000002787 reinforcement Effects 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000013178 mathematical model Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 239000002002 slurry Substances 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 9
- 239000004927 clay Substances 0.000 claims description 9
- 238000007431 microscopic evaluation Methods 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- 239000002131 composite material Substances 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 239000010703 silicon Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 239000012190 activator Substances 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000004452 microanalysis Methods 0.000 claims 2
- 238000011065 in-situ storage Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000009897 systematic effect Effects 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 18
- 239000000203 mixture Substances 0.000 description 9
- 239000002699 waste material Substances 0.000 description 7
- 239000010881 fly ash Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 230000007246 mechanism Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 239000002893 slag Substances 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 4
- 238000006253 efflorescence Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical group O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 206010037844 rash Diseases 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 238000012669 compression test Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000002440 industrial waste Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 238000007619 statistical method Methods 0.000 description 2
- 239000005995 Aluminium silicate Substances 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000004573 interface analysis Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010811 mineral waste Chemical group 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2111/00—Details relating to CAD techniques
- G06F2111/10—Numerical modelling
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/14—Force analysis or force optimisation, e.g. static or dynamic forces
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geometry (AREA)
- Civil Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Theoretical Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Paleontology (AREA)
- Mining & Mineral Resources (AREA)
- Computer Hardware Design (AREA)
- Soil Sciences (AREA)
- Architecture (AREA)
- Computational Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Evolutionary Computation (AREA)
- Agronomy & Crop Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a construction method for a geopolymer reinforced soft soil foundation, which can dynamically adjust a design scheme according to raw materials and foundation conditions, verify the characteristics of a solidified soil body by adopting an indoor test and a field test, ensure that the bearing capacity of the reinforced foundation is in a stable interval, provide a systematic construction method for the geopolymer reinforced soft soil foundation and simultaneously guide the reinforcing construction of the soft soil foundation. The invention solves the problems that the existing soft soil foundation in-situ reinforcement method is not beneficial to environmental protection and has low strength.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a construction method for reinforcing a soft soil foundation by using a geopolymer.
Background
At present, the total amount of carbon dioxide discharged per year in China exceeds 100 hundred million tons, wherein CO in the production process of building materials2The discharge amount and the waste occupy a large part, so the exploration and the research and the development of novel building materials with low energy consumption and low discharge become the key point of the current research in China.
In the existing soft soil foundation in-situ reinforcement scheme, CFG piles (Cement Fly ash Gravel piles) and granular piles are mainly used; the CFG pile needs to use cement, and the production energy consumption of the cement is very large; aggregate piles require the use of sandstone aggregates, which are non-renewable resources. Both are not favorable for environmental protection, and the conditions of pile breakage and strength lower than the designed value often occur.
Therefore, it is necessary to provide a construction method which can effectively utilize industrial waste residues and construction wastes to reinforce the foundation and reduce environmental pollution.
Disclosure of Invention
In order to overcome the defects in the prior art, a construction method for reinforcing a soft soil foundation by using a geopolymer is provided so as to solve the problems that the existing soft soil foundation in-situ reinforcing method is not beneficial to environmental protection and has low strength.
In order to achieve the purpose, the construction method for reinforcing the soft soil foundation by the geopolymer comprises the following steps:
determining the pile length of a geopolymer reinforcing pile, the raw material range of the geopolymer reinforcing pile, and main influence factors and value intervals of a geopolymer reinforcing design scheme according to geological information of a soft soil foundation to be reinforced;
determining a plurality of groups of raw material components and proportions thereof of the geopolymer reinforced pile according to a design experience formula;
performing indoor tests and microscopic analysis on the multiple groups of raw material components and the proportions thereof to determine the original optimal mixing amount of the multiple groups of raw material components;
preparing an experimental reinforcing pile and testing the original bearing capacity of the experimental reinforcing pile based on the original optimal mixing amount of the multiple groups of raw material components through a field test;
establishing a multi-parameter and multi-factor mathematical model of the geopolymer reinforced pile, and constructing a bearing capacity prediction formula of the geopolymer reinforced pile based on the original bearing capacity;
determining an optimal reinforcement scheme of the geopolymer reinforced pile based on the multi-parameter and multi-factor mathematical model and the bearing capacity prediction formula, wherein the optimal reinforcement scheme comprises a pile foundation form, a pile diameter, a pile length, a pile interval, a raw material mixing ratio, a water-cement ratio, a soil-material ratio, stirring time and water temperature;
preparing the geopolymer reinforced pile in the soft soil foundation to be reinforced based on the optimal reinforcement scheme, and acquiring field construction data in the preparation process of the geopolymer reinforced pile, wherein the construction data comprises drilling speed and pipe drawing speed;
and constructing a mathematical model based on field construction data of preparing the geopolymer reinforced piles in various soft soil foundations to obtain geopolymer reinforced design schemes in different soft soil foundations.
Further, the geological information includes clay type, bearing capacity, clay layer thickness and clay layer distribution.
Further, the step of determining the multiple groups of raw material components and the proportions thereof of the geopolymer reinforced pile according to a design experience formula comprises designing the multiple groups of raw material components and the proportions thereof by using a response surface construction method.
Further, the indoor tests comprise a solidified soil sample test and a geopolymer slurry test.
Further, the microscopic analysis includes microscopic analysis of the product and the interface at the end of the reaction to determine the type of the product produced by the action of the alkali activator and the stability of the product in structure and durability as the raw material added to the reaction as the source of the elements silicon and aluminum.
Further, the bearing capacity prediction formula is a regression equation of the bearing capacity of the single pile and a regression equation of the bearing capacity of the composite foundation, wherein the main influence factors are used as variables.
The construction method for strengthening the soft soil foundation by the geopolymer has the advantages that the design scheme can be dynamically adjusted according to raw materials and foundation conditions, the characteristics of the solidified soil body can be verified by adopting an indoor test and a field test, the bearing capacity after the foundation is strengthened can be ensured to be in a stable interval, the systematic construction method is provided for strengthening the soft soil foundation by the geopolymer, and meanwhile, the construction method is used for guiding the strengthening construction of the soft soil foundation.
Detailed Description
The present application will be described in further detail with reference to examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail with reference to examples.
The invention provides a construction method for reinforcing a soft soil foundation by geopolymer, which comprises the following steps:
s1: according to geological information of a soft soil foundation to be reinforced, determining the pile length of a geopolymer reinforcing pile, the raw material range of the geopolymer reinforcing pile, main influence factor raw materials of a geopolymer reinforcing design scheme and a value range of the main influence factor raw materials.
The geopolymer takes solid wastes such as coal-series kaolin, fly ash, mineral waste residues, coal gangue and the like as raw materials, and non-renewable limestone resources are not used in the production process.
In this embodiment, first, the pile length of the geopolymer reinforced pile, the range of usable raw materials of the geopolymer reinforced pile, and the appropriate material ratio are determined according to the geological survey of the soft soil foundation. Then, the existing literature results, single-factor experiments or the geopolymer reinforcement design scheme of the invention are utilized to determine the main influence factor raw materials and value intervals of the soft soil foundation reinforcement construction method, and then the response surface method is utilized to design the geopolymer test schemes with different components.
The geological information comprises clay type, bearing capacity, clay layer thickness and clay layer distribution.
The raw material range comprises materials which are rich in silicon and aluminum elements and can generate three-dimensional gel in geopolymer, and the raw materials specifically comprise: slag, fly ash, waste rubber powder, silica fume, metakaolin, waste concrete, high-aluminum-content alkaline waste liquid and the like.
The single factor is actually to experiment only one factor, while all other factors are fixed.
In this embodiment, the main influencing factor of the geopolymer reinforcement design scheme refers to the core index of the design test scheme, which plays a role in determining the success or failure of the test, such as the slag/fly ash mixing ratio, the sodium hydroxide mixing ratio and the water-cement ratio.
The value range of the main influence factors refers to the variation range of the main influence factors, for example, the sodium hydroxide doping amount generally varies between 10% and 20% of the raw material quality, the reaction is not thorough when the sodium hydroxide doping amount is less than 10%, and the efflorescence phenomenon can be caused when the sodium hydroxide doping amount is more than 20%, so that the sodium hydroxide doping amount generally does not exceed the value range when being designed.
S2: and determining a plurality of groups of raw material components and proportions thereof of the geopolymer reinforced pile according to a design empirical formula.
In this embodiment, the determination of the plurality of groups of raw material components and the ratio thereof by the design empirical formula means that the combination of several groups of raw materials and the ratio of each component are determined according to the design empirical formula in consideration of the cost of the raw materials.
Preferably, a plurality of groups of raw material components and the proportion thereof are designed by utilizing a response curved surface construction method. The construction method of the response curved surface is a statistical method which utilizes a reasonable test construction method and obtains certain data through experiments, adopts a multiple quadratic regression equation to fit the functional relation between factors and response values, seeks optimal process parameters through analysis of the regression equation and solves the multivariable problem.
The multiple groups of raw material components and the mixture ratio thereof refer to a series of tests which are respectively determined according to main influence factors and value intervals and are used for searching the optimal mixing amount and easily fitting a regression curve, wherein the raw material combination schemes of different components.
For example, the raw material combination scheme can be slag + fly ash + sodium hydroxide, or slag + metakaolin + sodium silicate, which is a raw material combination scheme with different components.
A series of tests determined from the main influencing factors and the value intervals refer to the different combination proportions of the raw materials, such as slag: fly ash: sodium hydroxide-7: 2:1 or 6.5:2.5:1 or 7.5:1.5:1, i.e. 3 different ratio runs.
S3: and performing indoor tests and microscopic analysis on the multiple groups of raw material components and the proportions thereof to determine the original optimal mixing amount of the multiple groups of raw material components.
Specifically, a plurality of groups of raw material components are subjected to indoor tests and microscopic analysis according to the mixture ratio, the test results are utilized to determine the performances of the geopolymer and the solidified soil body, the reaction mechanism of the geopolymer and the solidified soil body is researched, and the optimal mixing amount of each scheme is preliminarily determined.
In this example, laboratory tests, including the solidified soil sample test and the geopolymer slurry test, were performed.
Specifically, the solidified soil sample test is that the geopolymer is added with water to solidify and disturb the soil sample to be uniformly stirred and then is put into a mold for maintenance. And 3d or 7d later, performing a soil body shearing test or a conventional triaxial compression test on the solidified soil sample.
The geopolymer slurry test is to add water to geopolymer, stir the mixture evenly and then put the mixture into a mold for maintenance. After 3d or 7d, the geopolymer slurry was subjected to an unconfined compression test.
The microscopic analysis includes microscopic analysis of the product at the end of the reaction (i.e., the reaction product) and the interface to determine the type of the product produced by the action of the alkaline activator and the structural and durability stability of the product as the raw material added to the reaction as the source of elemental silicon or aluminum.
Wherein, the reaction product analysis adopts XRD (X-ray diffraction) test, and the interface analysis adopts SEM (scanning electron microscope) test. Microscopic analysis is a powerful basis for subsequent reaction mechanism research.
For geopolymers, the geopolymers are added with water to form slurry, and after the slurry is solidified for a period of time, the compressive strength and the flexural strength of the slurry are tested and used as strength design indexes of different geopolymers.
For the solidified soil body, the geopolymer slurry and the soil are uniformly stirred to form the solidified soil body, and after the soil body is solidified for a period of time, the shear strength of the soil body is tested and used as the strength design index of different geopolymer solidified soil bodies.
The reaction mechanism is used for describing all elementary reactions through which the geopolymer three-dimensional network structure is generated, and the purposes of setting up the internal relation of complex reactions and describing the internal relation between total reactions and elementary reactions are achieved. The study of geopolymer reaction mechanisms is the basis for the rapid establishment of mathematical models.
The optimal mixing amount of the geopolymer is determined preliminarily according to a plurality of groups of test results of different components and by combining with reaction mechanism judgment, and the material mixing amount capable of obtaining the highest shear strength under each component is determined preliminarily.
S4: and preparing an experimental reinforcing pile and testing the original bearing capacity of the experimental reinforcing pile based on the original optimal mixing amount of the multiple groups of raw material components.
The field test is used for preparing the experimental reinforcing pile, namely the in-situ reinforced soil body test, and the soil body is not subjected to sampling disturbance unlike the disturbed soil body, so that the obtained result is closer to the actual result. When the original bearing capacity of the experimental reinforcing pile is tested, a single-pile bearing capacity test is carried out on the pile foundation after pile forming, a composite foundation bearing capacity test is carried out, and the test result is recorded to obtain the original bearing capacity.
S5: and establishing a multi-parameter and multi-factor mathematical model of the geopolymer reinforced pile, and constructing a bearing capacity prediction formula of the geopolymer reinforced pile based on the original bearing capacity.
A multi-parameter, multi-factor mathematical model is a mathematical model that takes into account multiple variables and that has simultaneous multi-factor effects. And (5) performing significance test on the linear function, the second-order model and the third-order model by combining the step S3, and selecting a proper mathematical model.
According to the test results recorded by carrying out single pile bearing capacity test and composite foundation bearing capacity test on the pile foundation after pile forming, carrying out variance analysis and significance analysis on the determined proper mathematical model, and fitting a regression equation; and then carrying out error statistical analysis on the fitted regression equation, and checking the applicability of the mathematical model.
In this embodiment, the single-pile bearing capacity prediction formula and the composite foundation bearing capacity prediction formula are single-pile bearing capacity regression equations and composite foundation bearing capacity regression equations using a plurality of main influence factors as variables.
S6: and determining an optimal reinforcement scheme of the geopolymer reinforced pile based on the multi-parameter and multi-factor mathematical model and the bearing capacity prediction formula, wherein the optimal reinforcement scheme comprises a pile foundation form, a pile diameter, a pile length, a pile interval, a raw material mixing ratio, a water-cement ratio, a soil-material ratio, stirring time and water temperature.
Specifically, by using a regression equation (a single-pile bearing capacity prediction formula and a composite foundation bearing capacity prediction formula), an optimal reinforcement scheme which not only meets the requirement of the foundation bearing capacity, but also is economical and applicable is calculated. The optimal reinforcement scheme should include, but is not limited to, pile foundation form, pile diameter, pile length, pile spacing, raw material mix ratio, water cement ratio, soil-to-material ratio, mixing time, water temperature. Wherein, the pile foundation form can be a mixing pile or a screw pile.
S7: and preparing the geopolymer reinforced pile in the soft soil foundation to be reinforced based on the optimal reinforcement scheme, and acquiring field construction data in the preparation process of the geopolymer reinforced pile, wherein the construction data comprises drilling speed and pipe drawing speed.
Based on the optimal reinforcement scheme, the on-site construction is carried out, drilling machines such as a long spiral drilling machine and a triaxial mixing pile machine are selected, drilling is carried out to the designed depth, geological data is checked, geopolymer mixture is pumped, pipe drawing is started until the pile top after the drill pipe is filled with the mixture, the pipe drawing speed meets the process test standard, and the feeding amount is not less than the optimal mixing amount of the unit soil body. Collecting on-site construction data and problems existing in construction.
The design depth is determined according to the geological survey condition of the soft soil foundation, and the pile bottom of the mixing pile is arranged at the depth of the soil layer with the carrying capacity.
And checking the geological data to check whether the prospecting data is real or not, and if the prospecting data deviates from the actual situation, timely changing the optimal reinforcement scheme.
The geopolymer mixture is mixed slurry obtained by uniformly mixing and stirring a geopolymer solid material and water according to an optimal reinforcement scheme.
The geopolymer solid material is a solid mixture obtained by stirring a silicon-aluminum raw material and an exciting agent according to a certain proportion, and is convenient to store and transport. The geopolymer slurry can be formed after water is added on site, and is very convenient.
The process test standard is that before large-area construction, soft soil foundations with the same geological conditions are selected to carry out small-scale process tests so as to determine optimal construction process parameters.
The optimal mixing amount of the unit soil body is the soil-material ratio determined by the optimal reinforcement scheme, namely the mass ratio of the soil body to the mixture.
The field construction data refers to actual measurement parameters including but not limited to pile position deviation, verticality deviation, drilling speed, pipe drawing speed, real aperture and real hole depth.
The problems existing in the construction are the problems which are not beneficial to the construction in the current test scheme, such as the problems of efflorescence, difficult pipe drawing and the like. The efflorescence problem refers to soil whitening caused by overhigh alkali content in the raw materials, and the difficult tube drawing refers to the slow speed of the stirring rod during drawing out and is obviously lower than the drilling speed.
S8: and constructing a mathematical model based on field construction data of preparing the geopolymer reinforced piles in various soft soil foundations to obtain geopolymer reinforced design schemes in different soft soil foundations.
Specifically, the main influence factors and the value range determined by the original test scheme are optimized according to the field test result. And when the field construction data of different soft soil foundations are accumulated to form a mathematical model with the correlation of more than 95%, constructing geopolymer reinforcement design schemes aiming at different soft soil foundations, and dynamically adjusting to facilitate the subsequent design of the soft soil foundation schemes.
The geopolymer reinforcement design scheme for different soft soil foundations finally constructed by the invention is characterized in that the geopolymer reinforcement schemes for different types of soft soil foundations are calculated by substituting the soft soil foundation indexes into the scheme through the fitted regression curve by utilizing the main survey indexes of the soft soil foundation, and complete calculation basis and empirical data are provided as supports.
The construction method for the geopolymer reinforced soft soil foundation can dynamically adjust the design scheme according to raw materials and foundation conditions, verify the characteristics of the solidified soil body by adopting an indoor test and a field test, ensure that the bearing capacity of the reinforced foundation is in a stable interval, provide a systematic construction method for the geopolymer reinforced soft soil foundation and simultaneously guide the reinforcing construction of the soft soil foundation.
The construction method for reinforcing the soft soil foundation by the geopolymer fully utilizes industrial waste residues and construction wastes, can be used for construction by adding water and stirring on site, and replaces a resource consumption type reinforcing method represented by CFG (cement fly gravel) piles and granular piles in the traditional foundation reinforcing method.
According to the construction method for reinforcing the soft soil foundation by the geopolymer, the early strength of soft soil foundation reinforcement is improved by the geopolymer reinforcing pile, the foundation bearing capacity is predicted according to the reinforcement design scheme, the foundation bearing capacity is guaranteed, the construction interval is shortened, the labor and time waste is reduced, and the construction quality of foundation reinforcement is guaranteed.
The construction method for reinforcing the soft soil foundation by the geopolymer is applied to reinforcing various soft soil foundations, can provide design and experience guarantee for reinforcing the soft soil foundations, accurately estimates the bearing capacity of the soft soil foundations, designs an optimal geopolymer reinforcing scheme, improves the construction quality of the soft soil foundations, and reduces the invalid cost.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (6)
1. A construction method for reinforcing a soft soil foundation by geopolymer is characterized by comprising the following steps:
determining the pile length of a geopolymer reinforcing pile, the raw material range of the geopolymer reinforcing pile, and main influence factors and value intervals of a geopolymer reinforcing design scheme according to geological information of a soft soil foundation to be reinforced;
determining a plurality of groups of raw material components and proportions thereof of the geopolymer reinforced pile according to a design experience formula;
performing indoor tests and microscopic analysis on the multiple groups of raw material components and the proportions thereof to determine the original optimal mixing amount of the multiple groups of raw material components;
preparing an experimental reinforcing pile and testing the original bearing capacity of the experimental reinforcing pile based on the original optimal mixing amount of the multiple groups of raw material components through a field test;
establishing a multi-parameter and multi-factor mathematical model of the geopolymer reinforced pile, and constructing a bearing capacity prediction formula of the geopolymer reinforced pile based on the original bearing capacity;
determining an optimal reinforcement scheme of the geopolymer reinforced pile based on the multi-parameter and multi-factor mathematical model and the bearing capacity prediction formula, wherein the optimal reinforcement scheme comprises a pile foundation form, a pile diameter, a pile length, a pile interval, a raw material mixing ratio, a water-cement ratio, a soil-material ratio, stirring time and water temperature;
preparing the geopolymer reinforced pile in the soft soil foundation to be reinforced based on the optimal reinforcement scheme, and acquiring field construction data in the preparation process of the geopolymer reinforced pile, wherein the construction data comprises drilling speed and pipe drawing speed;
and constructing a mathematical model based on field construction data of preparing the geopolymer reinforced piles in various soft soil foundations to obtain geopolymer reinforced design schemes in different soft soil foundations.
2. The method of claim 1, wherein the geological information includes clay type, bearing capacity, clay layer thickness and clay layer distribution.
3. The method of claim 1, wherein the step of determining the plurality of raw material components and their ratios for the geopolymer-reinforced pile according to a design-experience formula comprises designing the plurality of raw material components and their ratios using a response-surface construction method.
4. A method of construction of a geopolymer reinforced soft soil foundation as claimed in claim 1, wherein said indoor tests include a solidified soil sample test and a geopolymer slurry test.
5. A method of constructing a soft soil foundation consolidated with a geopolymer according to claim 1, wherein the micro analysis comprises micro analysis of the products and interfaces at the end of the reaction to determine the types of the products produced by the reaction of the raw materials added as the source of silicon and aluminum elements, the action of the alkaline activator and whether the products have structural and durability stability.
6. The method of claim 1, wherein the formula for predicting the bearing capacity is a regression equation of the bearing capacity of the single pile and a regression equation of the bearing capacity of the composite foundation with the main influencing factors as variables.
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