CN106701100B - A kind of method of Salty Soil Subgrade filler and improvement roadbed - Google Patents
A kind of method of Salty Soil Subgrade filler and improvement roadbed Download PDFInfo
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- CN106701100B CN106701100B CN201710013851.3A CN201710013851A CN106701100B CN 106701100 B CN106701100 B CN 106701100B CN 201710013851 A CN201710013851 A CN 201710013851A CN 106701100 B CN106701100 B CN 106701100B
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- calcium
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- 239000002689 soil Substances 0.000 title claims abstract description 180
- 239000000945 filler Substances 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 49
- 230000006872 improvement Effects 0.000 title abstract description 9
- 241000894006 Bacteria Species 0.000 claims abstract description 25
- 244000005700 microbiome Species 0.000 claims abstract description 24
- 239000000203 mixture Substances 0.000 claims abstract description 22
- 159000000007 calcium salts Chemical class 0.000 claims abstract description 19
- 238000009472 formulation Methods 0.000 claims abstract description 19
- 108010046334 Urease Proteins 0.000 claims abstract description 17
- 239000004202 carbamide Substances 0.000 claims abstract description 15
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 14
- 150000003839 salts Chemical class 0.000 claims description 29
- 239000011780 sodium chloride Substances 0.000 claims description 19
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 15
- 238000011049 filling Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical group [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 12
- 239000000460 chlorine Substances 0.000 claims description 10
- 229910052801 chlorine Inorganic materials 0.000 claims description 10
- 239000003002 pH adjusting agent Substances 0.000 claims description 9
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 8
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical group [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 7
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 6
- 241000186547 Sporosarcina Species 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 5
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 5
- UNMYWSMUMWPJLR-UHFFFAOYSA-L Calcium iodide Chemical compound [Ca+2].[I-].[I-] UNMYWSMUMWPJLR-UHFFFAOYSA-L 0.000 claims description 4
- 241001478240 Coccus Species 0.000 claims description 4
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims description 4
- 229910001622 calcium bromide Inorganic materials 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical compound [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 claims description 4
- 229940046413 calcium iodide Drugs 0.000 claims description 4
- 229910001640 calcium iodide Inorganic materials 0.000 claims description 4
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 4
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 2
- 241000726221 Gemma Species 0.000 claims description 2
- 241000590002 Helicobacter pylori Species 0.000 claims description 2
- 241000192041 Micrococcus Species 0.000 claims description 2
- 241000588769 Proteus <enterobacteria> Species 0.000 claims description 2
- NKWPZUCBCARRDP-UHFFFAOYSA-L calcium bicarbonate Chemical compound [Ca+2].OC([O-])=O.OC([O-])=O NKWPZUCBCARRDP-UHFFFAOYSA-L 0.000 claims description 2
- 229910000020 calcium bicarbonate Inorganic materials 0.000 claims description 2
- LVGQIQHJMRUCRM-UHFFFAOYSA-L calcium bisulfite Chemical compound [Ca+2].OS([O-])=O.OS([O-])=O LVGQIQHJMRUCRM-UHFFFAOYSA-L 0.000 claims description 2
- 235000010260 calcium hydrogen sulphite Nutrition 0.000 claims description 2
- 238000005056 compaction Methods 0.000 claims description 2
- 229940037467 helicobacter pylori Drugs 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000008188 pellet Substances 0.000 claims description 2
- 210000000476 body water Anatomy 0.000 claims 1
- JXRVKYBCWUJJBP-UHFFFAOYSA-L calcium;hydrogen sulfate Chemical compound [Ca+2].OS([O-])(=O)=O.OS([O-])(=O)=O JXRVKYBCWUJJBP-UHFFFAOYSA-L 0.000 claims 1
- SEGLCEQVOFDUPX-UHFFFAOYSA-N di-(2-ethylhexyl)phosphoric acid Chemical compound CCCCC(CC)COP(O)(=O)OCC(CC)CCCC SEGLCEQVOFDUPX-UHFFFAOYSA-N 0.000 claims 1
- 239000001257 hydrogen Substances 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 claims 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 6
- 238000007906 compression Methods 0.000 abstract description 4
- 230000006835 compression Effects 0.000 abstract description 4
- 230000006378 damage Effects 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 238000002360 preparation method Methods 0.000 description 22
- 239000000243 solution Substances 0.000 description 10
- 239000002245 particle Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 239000000843 powder Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 229960005069 calcium Drugs 0.000 description 4
- 239000004568 cement Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 241000193395 Sporosarcina pasteurii Species 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001963 growth medium Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- -1 villaumite Chemical compound 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- AFCARXCZXQIEQB-UHFFFAOYSA-N N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CCNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 AFCARXCZXQIEQB-UHFFFAOYSA-N 0.000 description 1
- 239000001888 Peptone Substances 0.000 description 1
- 108010080698 Peptones Proteins 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 235000015278 beef Nutrition 0.000 description 1
- YYRMJZQKEFZXMX-UHFFFAOYSA-L calcium bis(dihydrogenphosphate) Chemical compound [Ca+2].OP(O)([O-])=O.OP(O)([O-])=O YYRMJZQKEFZXMX-UHFFFAOYSA-L 0.000 description 1
- 229940062672 calcium dihydrogen phosphate Drugs 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-M hydrogensulfate Chemical compound OS([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-M 0.000 description 1
- 230000001976 improved effect Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000009629 microbiological culture Methods 0.000 description 1
- 235000019691 monocalcium phosphate Nutrition 0.000 description 1
- 238000000643 oven drying Methods 0.000 description 1
- 235000019319 peptone Nutrition 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
-
- 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Architecture (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- General Engineering & Computer Science (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention relates to geotechnical engineering fields, disclose the method for a kind of Salty Soil Subgrade filler and improvement roadbed.Specifically, the present invention provides a kind of Salty Soil Subgrade fillers, wherein the Salty Soil Subgrade filler contains salinized soil, soluble calcium salt, urea and microorganism formulation, and the microorganism formulation contains the bacterium of urase and/or urease-producing.Salty Soil Subgrade filler compression strength with higher provided by the invention, simultaneously as using the microorganism being widely present in the soil body, it will not cause damages to environment and human body, advantage with environmental protection, and curing cycle can also be shortened, improve construction efficiency.
Description
Technical field
The present invention relates to geotechnical engineering fields, and in particular, to a kind of Salty Soil Subgrade filler and by the salt marsh dirt road
The method that based filler is used for roadbed improvement.
Background technique
Important component of the roadbed as entire transportation system, directly receiving superstructure load and vehicle are quiet
The long term of dynamic load, and the quality of roadbed quality directly affects running speed and traffic safety, it is therefore necessary to using excellent
The roadbed filling of matter fills.Into 21st century, as China express railway, personal rapid transit special line, heavy haul railway, high speed are public
The increasingly quickening on road, railway tunnel, vcehicular tunnel and metro construction, and the coastal strategy of country and strategy to develop western regions
Deep propulsion, more and more builds to foundation engineering are located at saline soil area.However, the salt content due to salinized soil is higher,
And there are the engineering problems such as molten sunken, salt is swollen, corrosion, it is extremely disadvantageous to engineering construction.
Currently, generalling use remote transport in salinized soil engineering construction or building stones factory buying high-quality roadbed filling
Mode improves Salty Soil Subgrade, but subgrade engineering certainly will be caused by buying high quality filler by transport at a distance or producer
The problems such as cost is excessively high, duration process.Therefore, the condition local in conjunction with construction is allowed to by carrying out improvement in situ to salinized soil
The basic demand for meeting roadbed filling and later period operation becomes the problem urgently to be resolved for Salty Soil Subgrade engineering construction.
Traditional soil improvement method carries out soil often through a series of stronger chemical curing agent of pollutions is added
Solidification.But due in salinized soil containing there are many salinity and salt content it is higher, use the effect of conventional curing agent stabilized saline soil
Fruit is unsatisfactory.For example, most common curing agent cement, plays solidification mainly by forming aquation silicon to common roadbed
Sour calcium (CSH), and a large amount of existing sulfate, villaumite, carbonate etc. in salinized soil, seriously affect the generation and stabilization of CSH, from
And cause the intensity of the salinized soil of cement solidification very low.Simultaneously as the salt ion in salinized soil largely exists for a long time, cement is solid
The salt erodibility endurance of the salinized soil of change is very weak, so utilizing Cement-Stabilized Saline Soil, it is difficult to guarantee the intensity of solidified earth, and be difficult to full
The requirement of sufficient project durability.And existing other soil-solidified-agents, realize that the hydrated product of solidification effect is still mainly CSH,
So all there is above-mentioned problem of solidification.In addition, existing chemical curing agent (such as fine cement, epoxy resin, acrylamide,
Phenolic resin, polyurethane etc.) toxicity or risk with higher to a certain extent.
Therefore, it is badly in need of finding a kind of method for improveing roadbed that improved effect is good, curing cycle is short, at low cost and environmentally friendly.
Summary of the invention
The purpose of the invention is to overcome drawbacks described above existing in the prior art, provides a kind of Salty Soil Subgrade and fill out
Material and the method that the Salty Soil Subgrade filler is used for roadbed improvement.The road that Salty Soil Subgrade filler provided by the invention is formed
Base, compression strength with higher, and also there is advantage at low cost and environmentally friendly.
To achieve the goals above, the present invention provides a kind of Salty Soil Subgrade fillers, wherein the Salty Soil Subgrade filler
Containing salinized soil, soluble calcium salt, urea and microorganism formulation, the microorganism formulation contains the bacterium of urase and/or urease-producing.
The present invention also provides a kind of methods for improveing roadbed, this method comprises: roadbed filling to be applied to the table of the soil body
Face, wherein the roadbed filling is above-mentioned Salty Soil Subgrade filler.
The present invention is by microorganism formulation, soluble calcium salt and the urea of salinized soil and the bacterium containing urase and/or urease-producing
It is applied in combination, the Ca generated using soluble calcium salt2+The CO generated with urase decomposing urea3 2-Form calcium carbonate not soluble in water
Crystal, the calcium carbonate crystal bond salt marsh soil particle as binding material, stable salinized soil grain skeleton are formed, to mention
Rise the compression strength of salinized soil.Simultaneously as using the microorganism being widely present in the soil body, environment and human body will not be made
At harm, there is the advantage of environmental protection, and curing cycle can also be shortened, improve construction efficiency.
In particular, roadbed filling provided by the invention can be carried out to the salinized soil soil body in situ using salinized soil as raw material
Transformation, so as to avoid higher economic cost and the longer duration caused by long-distance sand transport improvement roadbed filling, therefore,
With the advantage for reducing cost and shortening the construction period, have a good application prospect.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Specific embodiment
Detailed description of the preferred embodiments below.It should be understood that described herein specific
Embodiment is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
The present invention provides a kind of Salty Soil Subgrade fillers, wherein the Salty Soil Subgrade filler contains salinized soil, solubility
Calcium salt, urea and microorganism formulation, the microorganism formulation contain the bacterium of urase and/or urease-producing.
According to the present invention, in terms of butt, relative to the salinized soil of 100 parts by weight, the content of the soluble calcium salt can be with
For 1-40 parts by weight, the content of the urea can be 2-30 parts by weight, and the content of the microorganism formulation can be 1-20 weight
Measure part；
Preferably, in terms of butt, relative to the salinized soil of 100 parts by weight, the content of the soluble calcium salt is 1-10 weight
Part is measured, the content of the urea is 4-12 parts by weight, and the content of the microorganism formulation is 4-6 parts by weight.
In the present invention, term " salinized soil " refers to the general name of solonchak and alkaline earth and various salinization, alkali-affected soil.At me
State, salinized soil are mainly distributed on inland arid, semiarid zone and coastal region.
There is no particular limitation in source of the present invention to the salinized soil, can acquire comfortable China's salinized soil and mainly be distributed
Area.
According to the present invention, the salt content of the salinized soil is more than or equal to 0.3 weight %, preferably 0.3-10 weight %, more
Preferably 1-5 weight %.In the present invention, salt content is measured using oven drying method or conductance method.
In the present invention, the partial size of the salinized soil is more than or equal to 0.05mm, preferably 0.075-2mm, more preferably
0.25-2mm。
In the present invention, the salinized soil can be chlorine saline soil, sulfate-salinized soil, carbonate-saline soil, sub- chlorine saline soil
At least one of with sulfurous acid salinized soil, preferably at least one of chlorine saline soil, sulfate-salinized soil and carbonate-saline soil.
According to the present invention, to the type of the soluble calcium salt, there is no particular limitation, as long as free calcium can be provided
Ion, for example, the soluble calcium salt can be selected from calcium chloride, calcium nitrate, calcium dihydrogen phosphate, calcium bicarbonate, hydrogen sulfate
In at least one of calcium, calcium bisulfite, calcium bromide and calcium iodide, preferably calcium chloride, calcium bromide and calcium iodide at least
It is a kind of.
There is no particular limitation for use form of the present invention to the soluble calcium salt, can be solution and/or solid
Form, for example, can directly be used when the soluble calcium salt is the form of solution；When the soluble calcium salt is solid
Form when, can be first configured to solution use, or can in presence of water, by solid solubility calcium salt and remaining
Raw material mixing.
In the present invention, to the form of the microorganism formulation, there is no particular limitation, if can guarantee urase and/or
The bacterium of urease-producing has bioactivity, for example, can be the form of liquid and/or solid, it is preferable that when the microorganism
When preparation is liquid form, wherein any solvent of the bioactivity also containing the bacterium for being suitable for keeping urase and/or urease-producing, example
Such as, the solvent can be culture medium commonly used in the art.
In the present invention, to the source of the microorganism formulation, there is no particular limitation, for example, can pass through conventional quotient
Purchase obtains, and can also be prepared by conventional biological means.
According to the present invention, on the basis of the total amount of the salinized soil, the content of the bacterium of the urease-producing can be at least 1
×107CFU/g, preferably 1-100 × 107CFU/g。
In the present invention, the bacterium of the urease-producing can be bacillus and/or coccus, preferably bacillus, gemma coccus,
At least one of proteus and micrococcus, more preferably Pasteur's sporosarcina, Bacillus pasteurii, urea pellets bacterium
At least one of with helicobacter pylori, further preferably Pasteur's sporosarcina (Sporosarcina
) and/or Bacillus pasteurii (Bacillus pasteurii) pasteurii.
According to the present invention, the pH value of the Salty Soil Subgrade filler can be 6-9, preferably 7-8；Water content can be
10-40 weight %, preferably 20-30 weight %.
In the present invention, in order to guarantee the pH value of the Salty Soil Subgrade filler within the above range, the salt marsh dirt road
Based filler can also contain pH adjusting agent, and relative to the salinized soil of 100 parts by weight, the content of the pH adjusting agent is 0.1-10 weight
Measure part, preferably 0.5-5 parts by weight.
In the present invention, to the pH adjusting agent, there is no particular limitation, can be to be commonly used in the art for adjusting
Save the various acid and/or alkaline, inorganic salts of pH, it is preferable that the pH adjusting agent is in sodium bicarbonate and/or saleratus
It is at least one.
The present invention also provides the preparation method of above-mentioned Salty Soil Subgrade filler, the preparation method include by salinized soil, can
Dissolubility calcium salt, urea and microorganism formulation mixing, the microorganism formulation contain the bacterium of urase and/or urease-producing.Wherein, each original
Dosage, type and performance parameter of material etc. are as described above, details are not described herein.
In the present invention, to the mixed condition, there is no particular limitation, as long as each raw material can be made to be uniformly mixed i.e.
Can, for example, the mixed form can be stirring, the mixed temperature can be 20-45 DEG C.
According to the present invention, the present invention also provides a kind of methods for improveing roadbed, this method comprises: roadbed filling is applied
In the surface of the soil body, wherein the roadbed filling is above-mentioned Salty Soil Subgrade filler provided by the invention.
According to the present invention, it is 10-40 DEG C, preferably 30-35 DEG C that the condition of the application, which may include: temperature,；PH value is
5-10, preferably 6-9；Time is 5-21 days, preferably 7-14 days.
In the present invention, the mode of the application can be pave, at least one of mix and injection.
According to the present invention, the method can also include: that watering and compaction treatment, institute are carried out during the application
Watering is stated so that the water content of the roadbed filling is 10-40 weight %, preferably 20-30 weight %.
In the present invention, to the type of the soil body, there is no particular limitation, can be the common soil body, or special
The different soil body, it is preferable that the soil body is made of salinized soil, that is to say, that in Salty Soil Subgrade filler provided by the invention
The salinized soil can be obtained by in-situ acquisition.
In the present invention, the salt content of the soil body is more than or equal to 0.3 weight %, preferably 0.3-10 weight %, more excellent
It is selected as 1-5 weight %；Preferably, the partial size of the soil body is more than or equal to 0.05mm, preferably 0.075-2mm, preferably 0.25-
2mm；It is highly preferred that the water content of the soil body is 10-40 weight %, preferably 20-30 weight %；It is further preferred that institute
The soil body is stated by chlorine saline soil, sulfate-salinized soil, carbonate-saline soil, sub- at least one of chlorine saline soil and sulfurous acid salinized soil structure
At preferably at least one of chlorine saline soil, sulfate-salinized soil and carbonate-saline soil.
In situations where it is preferred, the present invention provides a kind of methods for improveing roadbed, method includes the following steps:
(1) salinized soil is acquired from salinized soil soil in-situ, by the salinized soil and soluble calcium salt, urea and microorganism system
Agent mixing, to obtain Salty Soil Subgrade filler；
(2) the Salty Soil Subgrade filler obtained by step (1) is applied to the surface of the salinized soil soil body；
Wherein, the microorganism formulation contains the bacterium of urase and/or urease-producing.
The present invention will be described in detail by way of examples below.
In following embodiment and comparative example,
Salt content in soil is measured according to method disclosed in LY/T 1251-199；
Unconfined compressive strength is measured according to " railway earthwork test rule TB10102-2010 ".
Preparation example 1
This preparation example is used to illustrate the method for manually preparing salinized soil.
Sodium sulphate is added into soil particle (acquiring from Harbin Bin County suburb), ground and sieving processing obtains
Salt content takes 1%, 3%, 5% salinized soil manually prepared of its mass fraction respectively, wherein partial size is the soil of 0.25-0.5mm
The 20% of the total soil particle weight of earth particle Zhan, partial size are the 20% of the total soil particle weight of soil particle Zhan of 0.5-1mm, grain
Diameter is the 60% of the total soil particle weight of 1-2mm particle Zhan.
Preparation example 2
This preparation example is used to illustrate the preparation method of microorganism formulation.
Pasteur's sporosarcina (is purchased from China General Microbiological culture presevation administrative center CGMCC, deposit number is
CGMCC NO.1.3687) it is inoculated in culture medium (formula: beef extract 5g/L, peptone 15g/L, sodium chloride 5g/L), in 30 DEG C
Lower culture 48h, obtaining density is 1 × 109The bacterium solution of CFU/mL.
Embodiment 1
The present embodiment is for illustrating Salty Soil Subgrade filler provided by the invention and preparation method thereof.
100g is weighed to be urinated by the salinized soil, 5g anhydrous calcium chloride powder, 8g that the salt content that preparation example 1 obtains is 1 weight %
The bacterium solution and 1g sodium bicarbonate that element (be purchased from chemical company, western Shandong, similarly hereinafter), 10mL are obtained by preparation example 2, place it in and stir
It mixes in machine and stirs 0.5h under room temperature (25 DEG C), obtain Salty Soil Subgrade filler A1 (pH value 8, water content are 25 weight %).
After measured, the results are shown in Table 1 for the unconfined compressive strength of Salty Soil Subgrade filler A1.
Embodiment 2
The present embodiment is for illustrating Salty Soil Subgrade filler provided by the invention and preparation method thereof.
Weigh salinized soil, 10g anhydrous calcium chloride powder, 12g that 100g is 1 weight % by the salt content that preparation example 1 obtains
The bacterium solution and 0.5g sodium bicarbonate that urea, 30mL are obtained by preparation example 2, place it in blender and stir under room temperature (25 DEG C)
0.5h obtains Salty Soil Subgrade filler A2 (pH value 8, water content are 30 weight %).
After measured, the results are shown in Table 1 for the unconfined compressive strength of Salty Soil Subgrade filler A2.
Embodiment 3
The present embodiment is for illustrating Salty Soil Subgrade filler provided by the invention and preparation method thereof.
100g is weighed to be urinated by the salinized soil, 1g anhydrous calcium chloride powder, 4g that the salt content that preparation example 1 obtains is 1 weight %
The bacterium solution and 5g sodium bicarbonate that element, 10mL are obtained by preparation example 2, place it in blender and stir under room temperature (25 DEG C)
0.5h obtains Salty Soil Subgrade filler A3 (pH value 7, water content are 00 weight %).
After measured, the results are shown in Table 1 for the unconfined compressive strength of Salty Soil Subgrade filler A3.
Embodiment 4
The present embodiment is for illustrating Salty Soil Subgrade filler provided by the invention and preparation method thereof.
The procedure of Example 1 was followed except that using the salt content of identical weight obtained by preparation example 1
Replacing salt content used in embodiment 1 by the salinized soil of 3 weight % is the salinized soil of 1 weight %, obtains Salty Soil Subgrade and fills out
Expect A4.
After measured, the results are shown in Table 1 for the unconfined compressive strength of Salty Soil Subgrade filler A4.
Embodiment 5
The present embodiment is for illustrating Salty Soil Subgrade filler provided by the invention and preparation method thereof.
The procedure of Example 1 was followed except that using the salt content of identical weight obtained by preparation example 1
Replacing salt content used in embodiment 1 by the salinized soil of 5 weight % is the salinized soil of 1 weight %, obtains Salty Soil Subgrade and fills out
Expect A5.
After measured, the results are shown in Table 1 for the unconfined compressive strength of Salty Soil Subgrade filler A5.
Embodiment 6
The present embodiment is for illustrating Salty Soil Subgrade filler provided by the invention and preparation method thereof.
The procedure of Example 1 was followed except that (being had purchased from Shang Hai Tuo Yang biotechnology using 10g urase powder
Limit company, article No. is by Y020089) bacterium solution used in embodiment 1 is replaced, obtain Salty Soil Subgrade filler A6.
After measured, the results are shown in Table 1 for the unconfined compressive strength of Salty Soil Subgrade filler A6.
Embodiment 7
The method that the present embodiment is used to illustrate improvement roadbed provided by the invention.
The procedure of Example 1 was followed except that using the acquisition of identical weight from the Jiayu Pass to Anxi level-one
(4.5 weight % of salt content, partial size 2mm is hereinafter, pH value is obtained the salinized soil of highway by 8) replacing salinized soil used in embodiment 1
To Salty Soil Subgrade filler A7.
Salinized soil filler A7 is paved on the soil body of this area, is then compacted, roadbed maintenance is carried out at 35 DEG C, is being supported
Constantly sprinkle water during shield, to guarantee the water content of salinized soil filler A7 not less than 30 weight %, after maintenance 7 days, sample into
Row measurement.
After measured, the results are shown in Table 1 for the unconfined compressive strength of Salty Soil Subgrade filler A7.
Comparative example 1
It is carried out according to the method for embodiment 7, the difference is that being added without bacterium solution, obtains roadbed filling D1.
After measured, the results are shown in Table 1 for the unconfined compressive strength of roadbed filling D1.
Comparative example 2
Weigh 100g acquisition from the Jiayu Pass to Anxi Class I highway salinized soil (salt content 4.5 weight %, partial size 2mm with
Under, pH value 8), 24g lime powder is added, places it in blender and stirs 0.5h under room temperature (25 DEG C), obtain salt marsh
Dirt road based filler D2.
After measured, the results are shown in Table 1 for the unconfined compressive strength of roadbed filling D2.
Table 1
By the way that above embodiments 1-7 is compared with the result of comparative example 1-2 it is found that Salty Soil Subgrade provided by the invention
Filler compression strength with higher, simultaneously as the microorganism being widely present in the soil body is used, it will not be to environment and people
Body causes damages, and has the advantage of environmental protection, and can also shorten curing cycle, improves construction efficiency.
The preferred embodiment of the present invention has been described above in detail, still, during present invention is not limited to the embodiments described above
Detail within the scope of the technical concept of the present invention can be with various simple variants of the technical solution of the present invention are made, this
A little simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, it can be combined in any appropriate way.In order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (21)
1. a kind of method for improveing roadbed, this method comprises: Salty Soil Subgrade filler to be applied to the surface of the soil body, feature exists
In the Salty Soil Subgrade filler contains salinized soil, soluble calcium salt, urea and microorganism formulation, and the microorganism formulation contains
There is the bacterium of urase and/or urease-producing, wherein in terms of butt, relative to the salinized soil of 100 parts by weight, the soluble calcium salt
Content is 1-40 parts by weight, and the content of the urea is 2-30 parts by weight, and the content of the microorganism formulation is 1-20 parts by weight；
The salt content of the soil body is more than or equal to 0.3 weight %, and the partial size of the soil body is more than or equal to 0.05mm, the soil body
Water content is 10-40 weight %；
The soil body by chlorine saline soil, sulfate-salinized soil, carbonate-saline soil, sub- chlorine saline soil and sulfurous acid salinized soil at least
A kind of composition.
2. described solvable relative to the salinized soil of 100 parts by weight in terms of butt according to the method described in claim 1, wherein
Property calcium salt content be 1-10 parts by weight, the content of the urea is 4-12 parts by weight, and the content of the microorganism formulation is 4-6
Parts by weight.
3. method according to claim 1 or 2, wherein in terms of butt, the salt content of the salinized soil is more than or equal to 0.3
The partial size of weight %, the salinized soil are more than or equal to 0.05mm.
4. in terms of butt, the salt content of the salinized soil is 0.3-10 weight % according to the method described in claim 3, wherein,
The salinized soil partial size is 0.075-2mm.
5. according to the method described in claim 4, wherein, in terms of butt, the salt content of the salinized soil is 1-5 weight %, institute
Stating salinized soil partial size is 0.25-2mm.
6. method according to claim 1 or 2, wherein the salinized soil is chlorine saline soil, sulfate-salinized soil, carbonate
Stain soil, sub- at least one of chlorine saline soil and sulfurous acid salinized soil.
7. method according to claim 1 or 2, wherein the soluble calcium salt is selected from calcium chloride, calcium nitrate, di(2-ethylhexyl)phosphate
At least one of hydrogen calcium, calcium bicarbonate, calcium bisulfate, calcium bisulfite, calcium bromide and calcium iodide.
8. according to the method described in claim 7, wherein, the soluble calcium salt is in calcium chloride, calcium bromide and calcium iodide
At least one.
9. method according to claim 1 or 2, wherein on the basis of the total amount of the salinized soil, the bacterium of the urease-producing
Content be at least 1 × 107CFU/g；The bacterium of the urease-producing is bacillus and/or coccus.
10. according to the method described in claim 9, wherein, on the basis of the total amount of the salinized soil, the bacterium of the urease-producing
Content is 1-100 × 107CFU/g；The bacterium of the urease-producing is in bacillus, gemma coccus, proteus and micrococcus
It is at least one.
11. according to the method described in claim 10, wherein, the bacterium of the urease-producing is Pasteur's sporosarcina, Ba Shiya
At least one of spore bacillus, urea pellets bacterium and helicobacter pylori.
12. according to the method for claim 11, wherein the bacterium of the urease-producing be Pasteur's sporosarcina and/or bar
Family name bacillus.
13. method according to claim 1 or 2, wherein the pH value of the Salty Soil Subgrade filler is 6-9；Water content is
10-40 weight %；
The Salty Soil Subgrade filler also contains pH adjusting agent, and relative to the salinized soil of 100 parts by weight, the pH adjusting agent contains
Amount is 0.1-10 parts by weight.
14. according to the method for claim 13, wherein the pH value of the Salty Soil Subgrade filler is 7-8；Water content is
20-30 weight %；
The Salty Soil Subgrade filler also contains pH adjusting agent, and relative to the salinized soil of 100 parts by weight, the pH adjusting agent contains
Amount is 0.5-5 parts by weight.
15. method described in 3 or 14 according to claim 1, the pH adjusting agent is sodium bicarbonate and/or saleratus.
16. according to the method described in claim 1, wherein, the condition of the application includes: that temperature is 10-40 DEG C, pH value 5-
10, the time is 5-21 days；The mode of the application be pave, at least one of mix and injection.
17. according to the method for claim 16, wherein the condition of the application includes: that temperature is 30-35 DEG C, and pH value is
6-9, time are 7-14 days.
18. according to claim 1 or method described in 16, wherein the method also includes: it carries out during the application
Watering and compaction treatment, the watering is so that the water content of the roadbed filling is 10-40 weight %.
19. according to the method for claim 18, wherein the watering is so that the water content of the roadbed filling is 20-30
Weight %.
20. according to the method for claim 19, wherein the salt content of the soil body is 0.3-10 weight %, the soil body
Partial size be 0.075-2mm, the water content of the soil body is 20-30 weight %.
21. according to the method for claim 20, wherein the salt content of the soil body is 1-5 weight %, the grain of the soil body
Diameter is 0.25-2mm.
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