CN108824111A - It is a kind of that real method is hit based on biological cementing road foundation - Google Patents
It is a kind of that real method is hit based on biological cementing road foundation Download PDFInfo
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- CN108824111A CN108824111A CN201810658578.4A CN201810658578A CN108824111A CN 108824111 A CN108824111 A CN 108824111A CN 201810658578 A CN201810658578 A CN 201810658578A CN 108824111 A CN108824111 A CN 108824111A
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- moisture content
- urea
- calcium chloride
- soil
- optimum moisture
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- 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
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- 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
- E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder
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- 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
- E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a kind of road foundations cementing based on biology to hit real method, which is characterized in that includes the following steps：1) field sampling；After collecting subgrade soils soil sample, natural moisture content is tested, then optimum moisture content is determined by compaction test；The quantity many 5 of the subgrade soils soil sample；2) analysis of experiments；2.1) subgrade soils for water content more than optimum moisture content mix anhydrous calcium chloride, then mix urea, stir；2.2) it is lower than the foundation soil of optimum moisture content for water content, mixes the mixed solution of urea and calcium chloride, stirring；2.3) Bacillus pasteurii cell, stirring are sprayed into；2.4) volume maximum value and its it is lower choose 5 different volume values and carry out compaction tests, obtain the maximum urea of dry density and calcium chloride volume, as optimal mixing amount；3) stirring paves；It according to optimal mixing amount, adds urea and calcium chloride and sprays Bacillus pasteurii cell, after stirring, layering paves, and is densified to design dry density.
Description
Technical field
The present invention relates to road foundation Construction Technology field, specifically a kind of road foundation cementing based on biology is hit
Real method.
Background technique
Compactness is the major quality controlling index of road foundation construction.The compacting of roadbed is for reducing under traffic load
Permanent deformation, prevents roadbed from generating depression, crack and water destruct in use and has a very important significance.Compactness takes
Certainly in Compaction Effort and water content.Under certain Compaction Effort, there is the water content by soil pressure to maximum compactness, which claims
For optimum moisture content.However, the water content of subgrade soils is usually not equal to optimum moisture content.
The low subgrade soils of water content lack the lubricating action of moisture film, generate that relative displacement is more difficult to be not easy to reach compacting between particle
Degree requires, and applies the certain moisture of man-hour requirement sprinkling and improves its water content.It is native for high-moisture, pore water pressure under external action
Power easily increases, and the effective stress of particle is not easy to improve, and is easy to happen overall deformation, occurs " spongy soil " in cohesive soil without viscous
Property soil in the phenomenon that liquefying.When thus constructing or by its outer abandoning or by drying or adding the modes such as lime, cement
Reduce water content.
It is directed to the processing of swelled ground, high liquid limit soil, High water cut Extra-fine sand etc. in the prior art based on lime and cement, applies
Often easily there is mass defect such as in work：, there is interlayer, surface is easy hollow, peeling etc. in rendzinas cracking.
Although lime and cement have preferable water absorbing capacity, more difficult to stir evenly, because lime, cement are hydraulic
Property material water suction after generate and be insoluble in the colloid of water, colloid wraps up grogs, causes grogs unity difficulties in dispersion.Although many engineerings
Dirt or soil cement has been used to improve water content construction in later period effect still poor.
And for the lower subgrade soils of water content, there is also stirring is difficult, it is more difficult to which the phenomenon that water is added in control.It obtains
Mixing quality is good to be filled material then to need to expend higher energy higher so as to cause construction cost, and slow setting, stirring matter are found
It measures manageable, while lesser water suction filler is influenced for raising roadbed filling quality on later period consolidation effect, reduction is built the road
Cost has positive social and economic implications.
Summary of the invention
Present invention aim to address problems of the prior art, provide a kind of road foundation cementing based on biology
Hit real method.
To realize the present invention purpose and the technical solution adopted is that such, a kind of road foundation cementing based on biology is hit
Real method, which is characterized in that include the following steps：
1) field sampling
After collecting subgrade soils soil sample, the natural moisture content of subgrade soils soil sample is tested, then subgrade soils are determined by compaction test
The optimum moisture content of soil sample；
When natural moisture content is greater than optimum moisture content, the value more than optimum moisture content is denoted as we, we=w-wop；
When natural moisture content is less than optimum moisture content, the value less than optimum moisture content is denoted as wl, wl=wop-w；
The quantity many 5 of the subgrade soils soil sample；
2) analysis of experiments
2.1) subgrade soils for water content more than optimum moisture content mix anhydrous calcium chloride, then mix urea, then will
Roadbed earth mixtures is stirred；
2.2) it is lower than the foundation soil of optimum moisture content for water content, mixes the mixed solution of urea and calcium chloride, stirring；
2.3) into the constructing soil for mixing calcium chloride and urea obtained in step 2.1) and step 2.2), penetrating culture 24~
The Bacillus pasteurii cell of 48h, stirring；
2.4) by volume maximum value in step 2.3) and its under randomly select 5 different volume values and carry out compaction tests,
Obtain the maximum urea of dry density and calcium chloride volume, as optimal mixing amount；
3) stirring paves
The optimal mixing amount according to obtained in step 2.4) adds urea and calcium chloride and to spray Bacillus pasteurii thin
Born of the same parents, after stirring, layering paves, and is densified to design dry density.
Further, anhydrous calcium chloride incorporation maximum value is M in every 100 parts of soil in the step 2.1)c=0.51we。
Further, urea incorporation maximum value is M in every 100 parts of soil in the step 2.1)u=0.94we。
Further, the urea in the step 2.2) in mixed solution is identical with calcium chloride concentration；The urea and chlorination
The concentration of calcium is 0.5~1mol/L.
Further, in the step 2.3) Pasteur's bacillus cell straying quatity：
In constructing soil for mixing calcium chloride and urea obtained in step 2.1), the straying quatity of Bacillus pasteurii cell
For we0.1 times；
In constructing soil for mixing calcium chloride and urea obtained in step 2.2), the straying quatity of Bacillus pasteurii cell
For wl0.1 times.
Further, in the step 3) every layer roll after, surface spray Bacillus pasteurii cell liquid.The present invention
Have the technical effect that unquestionable, the present invention has the following advantages that：
1) anhydrous calcium chloride in the present invention and urea are sheet or globular solids, compare lime and when cement is constructed not
It is also easy to produce dust, is had fewer environmental impacts.
2) metal cation that subgrade soils are neutralized after the negatively charged addition of Bacillus pasteurii cell surface in the present invention, mentions
The mix of elevated formation level soil can be stirred the mixture for uniformly using less energy.
3) anhydrous calcium chloride in the present invention can consume itself nearly 1 times of moisture, and it is same that hydrolysis of urea can further consume water
The calcium carbonate-filled hole of Shi Shengcheng, it is more closely knit to roll rear subgrade soils, prevents subgrade soils from cracking.
4) the calcium carbonate blocking hole generated in the present invention, promotes the globality of subgrade soils, subgrade soils after reduction processing
Permeability prevents pavement construction is bad from leading to water destructs such as " purt slurries " occur during later period operation.
Detailed description of the invention
Fig. 1 is the CBR value under the calcareous sand tamping curve that comparative example 1 of the present invention obtains and the optimum moisture content；
Fig. 2 is the CBR value under the calcareous sand tamping curve that the embodiment of the present invention 1 obtains and the optimum moisture content.
Specific embodiment
Below with reference to embodiment, the invention will be further described, but should not be construed the above-mentioned subject area of the present invention only
It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used
With means, various replacements and change are made, should all include within the scope of the present invention.
Embodiment 1：
Calcareous sand is widely distributed on China South China Sea Islands, by taking the calcareous sand at Haikou as an example.
It is a kind of that real method is hit based on biological cementing road foundation, which is characterized in that include the following steps：
1) field sampling
After collecting 5 parts of calcareous sand dry sand subgrade soils soil samples, number 1,2,3,4,5；Test subgrade soils soil sample naturally contains
Water, then determine by compaction test the optimum moisture content of subgrade soils soil sample；
When natural moisture content is greater than optimum moisture content, the value more than optimum moisture content is denoted as we, we=w-wop；
When natural moisture content is less than optimum moisture content, the value less than optimum moisture content is denoted as wl, wl=wop-w；
The natural moisture content for testing 5 parts of obtained subgrade soils soil samples is respectively 2%；Compaction test determines subgrade soils soil sample
Optimum moisture content is 19%；
The parameter of the liquid content can substitute water content, and the liquid content is the quality and dry sand quality of liquid in hole
The ratio between；
2) analysis of experiments
2.1) it is lower than the foundation soil of optimum moisture content for water content, mixes the mixed solution of urea and calcium chloride, respectively
The liquid content for obtaining 1,2,3,4, No. 5 sand samples is w1=8.16%, w2=11.2%, w3=12.8%, w4=14.4%, w5=
16%；Stirring；
Urea in the mixed solution is identical with calcium chloride concentration；The equal 1mol/L of the concentration of the urea and calcium chloride.
2.2) into the constructing soil for mixing calcium chloride and urea obtained in step 2.1), the Pasteur's gemma of culture for 24 hours is sprayed into
Bacilli-cell；Obtaining liquid content is w1=10.2%, w2=14%, w3=16%, w4=18%, w5=19%, stirring；Cell liquid
Mix significantly improves after addition；
The straying quatity of the Bacillus pasteurii cell is wl0.1 times.
2.3) compaction tests are carried out by the different volume values of volume maximum value in step 2.2) and its lower selection 5；
Dry density of 1~No. 5 soil sample under corresponding liquid content state is respectively ρ after hitting reality1=1.269g/cm3、ρ2=
1.294g/cm3、ρ3=1.303g/cm3、ρ4=1.269g/cm3、ρ5=1.255g/cm3；
Draw liquid content-dry density curve as shown in Fig. 2, optimal liquid content be 16%, maximum dry density 1.303g/
cm3。
3) stirring paves
Urea and calcium chloride and Bacillus pasteurii cell liquid is added to optimal liquid content 16%, hits reality after mixing evenly,
And a small amount of Bacillus pasteurii cell liquid is sprayed on its surface, the CBR value that specimen surface appearance crust measures after 3 days is：
10.0%.
Comparative example 1：
By taking the calcareous sand at Haikou as an example, follow the steps below：
1) 5 progress compaction tests of calcareous sand soil sample identical with 1 water content of embodiment are taken again, obtain water content and are done
Density parameter is：(14%, 1.248g/cm3), (16%, 1.260g/cm3), (18%, 1.274g/cm3), (22%, 1.254g/
cm3), (24%, 1.2301g/cm3)。
2) data obtained in step 1) are plotted on water content-dry density curve, obtain curve graph as shown in Figure 1,
Optimum moisture content is 19%.
3) the real sample that hits under optimum moisture content is taken, progress CBR, which tests to obtain CBR value, is：5.0%.
By comparative example 1 and comparative example 1, it is found that the optimum moisture content of embodiment 1 is 16%, less than comparative example 1
Optimum moisture content 19%, and optimal dry density is greater than the optimal dry density of comparative example 1 in embodiment 1.
Compare the CBR value of embodiment 1 and comparative example 1 under optimum moisture content, it was demonstrated that more normal based on compacting step of the invention
Intensity is higher after rule method hits reality.
Embodiment 2：
Red clay is mainly distributed on south China, and the often obvious dehydration of cranny development is easily shunk inside original state red clay, and
Natural moisture content is higher, is difficult for it to be compacted to regulation compactness.
Chongqing red clay is chosen in the present embodiment；
It is a kind of that real method is hit based on biological cementing road foundation, which is characterized in that include the following steps：
1) field sampling
Natural red clay water content 34% is measured, 5 parts are divided into after drying, number is 6,7,8,9,10 respectively；
Obtaining optimum moisture content by modified compaction test is 29%.
2) analysis of experiments
2.1) subgrade soils for water content more than optimum moisture content mix anhydrous calcium chloride, then mix urea, then will
Roadbed earth mixtures is stirred；
Every 26.8kg natural earth sequentially added in 6,7,8,9, No. 10 soil samples calcium chloride and urea amount be respectively (60g,
30g), (50g, 25g), (40g, 20g), (30g, 15g), (20g, 10g).
2.2) into the constructing soil for mixing calcium chloride and urea obtained in step 2.1), the Pasteur's gemma of culture for 24 hours is sprayed into
Bacilli-cell, stirring；
The straying quatity of the Bacillus pasteurii cell is 134g；
2.3) compaction tests are carried out by the different volume values of volume maximum value in step 2.2) and its lower selection 5, obtained
The maximum urea of dry density and calcium chloride volume, as optimal mixing amount (50g, 25g)；
3) stirring paves
The optimal mixing amount according to obtained in step 2.3) (50g, 25g) adds urea and calcium chloride and sprays Pasteur's bud
Spore bacilli-cell, after stirring, layering paves, and is densified to design dry density.
After every layer is rolled, Bacillus pasteurii cell liquid is sprayed on surface.
Take under (50g, 25g) volume compacted soil samples carry out CBR and test to obtain CBR value be：41%.
Claims (6)
1. a kind of road foundation cementing based on biology hits real method, which is characterized in that include the following steps：
1) field sampling
After collecting subgrade soils soil sample, the natural moisture content of subgrade soils soil sample is tested, then subgrade soils soil sample is determined by compaction test
Optimum moisture content；
When natural moisture content is greater than optimum moisture content, the value more than optimum moisture content is denoted as we, we=w-wop；
When natural moisture content is less than optimum moisture content, the value less than optimum moisture content is denoted as wl, wl=wop-w；
The quantity of the subgrade soils soil sample is no less than 5；
2) analysis of experiments
2.1) be more than for water content optimum moisture content subgrade soils, mix anhydrous calcium chloride, then mix urea, then by roadbed
Earth mixtures is stirred；
2.2) it is lower than the foundation soil of optimum moisture content for water content, mixes the mixed solution of urea and calcium chloride, stirring；
2.3) into the constructing soil for mixing calcium chloride and urea obtained in step 2.1) and step 2.2), 24~48h of culture is sprayed into
Bacillus pasteurii cell, stirring；
2.4) by volume maximum value in step 2.3) and its under randomly select 5 different volume values and carry out compaction tests, obtain
The maximum urea of dry density and calcium chloride volume, as optimal mixing amount；
3) stirring paves
The optimal mixing amount according to obtained in step 2.4) adds urea and calcium chloride and sprays Bacillus pasteurii cell, stirs
After mixing, layering paves, and is densified to design dry density.
2. a kind of road foundation cementing based on biology according to claim 1 hits real method, it is characterised in that：The step
It is rapid 2.1) in every 100 parts of soil anhydrous calcium chloride incorporation maximum value be Mc=0.51we。
3. a kind of road foundation cementing based on biology according to claim 1 hits real method, it is characterised in that：The step
It is rapid 2.1) in every 100 parts of soil urea incorporation maximum value be Mu=0.94we。
4. a kind of road foundation cementing based on biology according to claim 1 hits real method, it is characterised in that：The step
It is rapid 2.2) in urea in mixed solution it is identical with calcium chloride concentration；The concentration of the urea and calcium chloride is 0.5~1mol/
L。
5. a kind of road foundation cementing based on biology according to claim 1 hits real method, which is characterized in that the step
It is rapid 2.3) in Pasteur's bacillus cell straying quatity：
In constructing soil for mixing calcium chloride and urea obtained in step 2.1), the straying quatity of Bacillus pasteurii cell is we
0.1 times；
In constructing soil for mixing calcium chloride and urea obtained in step 2.2), the straying quatity of Bacillus pasteurii cell is wl
0.1 times.
6. a kind of road foundation cementing based on biology according to claim 1 hits real method, it is characterised in that：The step
It is rapid 3) in every layer roll after, surface spray Bacillus pasteurii cell liquid.
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| CN201810658578.4A CN108824111B (en) | 2018-06-25 | 2018-06-25 | Road subgrade compaction method based on biological cementation |
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| CN201810658578.4A CN108824111B (en) | 2018-06-25 | 2018-06-25 | Road subgrade compaction method based on biological cementation |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113417273A (en) * | 2021-06-29 | 2021-09-21 | 中铁十八局集团第一工程有限公司 | Silt stratum underground pipe gallery foundation sand replacement and filling reinforcement method |
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| CN1963022A (en) * | 2006-11-22 | 2007-05-16 | 天津市市政工程设计研究院 | Use method of industrial caustic dross in treatment of road bed and foundation |
| CN105137050A (en) * | 2015-08-26 | 2015-12-09 | 中铁第四勘察设计院集团有限公司 | Method for improving efficiency of roadbed filling improvement test |
| CN106498829A (en) * | 2016-10-26 | 2017-03-15 | 中国科学院地质与地球物理研究所 | A kind of cured modified processing method of pavement of road basic unit |
| CN106701100A (en) * | 2017-01-09 | 2017-05-24 | 中国神华能源股份有限公司 | Saline soil roadbed filler and method for improving roadbed |
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2018
- 2018-06-25 CN CN201810658578.4A patent/CN108824111B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1963022A (en) * | 2006-11-22 | 2007-05-16 | 天津市市政工程设计研究院 | Use method of industrial caustic dross in treatment of road bed and foundation |
| CN105137050A (en) * | 2015-08-26 | 2015-12-09 | 中铁第四勘察设计院集团有限公司 | Method for improving efficiency of roadbed filling improvement test |
| CN106498829A (en) * | 2016-10-26 | 2017-03-15 | 中国科学院地质与地球物理研究所 | A kind of cured modified processing method of pavement of road basic unit |
| CN106701100A (en) * | 2017-01-09 | 2017-05-24 | 中国神华能源股份有限公司 | Saline soil roadbed filler and method for improving roadbed |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113417273A (en) * | 2021-06-29 | 2021-09-21 | 中铁十八局集团第一工程有限公司 | Silt stratum underground pipe gallery foundation sand replacement and filling reinforcement method |
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