CN106153860A - A kind of device and method of one-dimensional microorganism grouting and reinforcing silt test - Google Patents
A kind of device and method of one-dimensional microorganism grouting and reinforcing silt test Download PDFInfo
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- CN106153860A CN106153860A CN201610467436.0A CN201610467436A CN106153860A CN 106153860 A CN106153860 A CN 106153860A CN 201610467436 A CN201610467436 A CN 201610467436A CN 106153860 A CN106153860 A CN 106153860A
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Abstract
The invention discloses the device and method of a kind of one-dimensional microorganism grouting and reinforcing silt test, device includes model groove, Air Pressure Unit, consolidating fluid bottle, pressure slurry feeding device, recycling bin, moisture separator and vavuum pump, the top of model groove connects consolidating fluid bottle by flexible pipe, consolidating fluid bottle is connecting Air Pressure Unit by flexible pipe, the bottom of model groove is connected recycling bin and moisture separator respectively by flexible pipe, and moisture separator connects vavuum pump；In model groove, lower end is provided with the dividing plate with several holes, and is equipped with filter paper on dividing plate；The method that the present invention uses pressure to inhale carries out slip casting to silt, and model groove top is a resistance to compression steel cage, and bottom is provided with glass with hole plate, and glass with hole plate is placed filter paper, added that vacuum pressure can be evenly distributed on soil body lower surface below glass with hole plate.Utilize this device to carry out grouting and reinforcing experiment to silt, the experiment of various bacterium solution, microorganism soil mass consolidation effect under the conditions of different pressures can be set.
Description
Technical field
The invention belongs to grouting test technical field, particularly to the dress of a kind of one-dimensional microorganism grouting and reinforcing silt test
Put and method.
Background technology
With the quickening of current China modernization, during coastal cities are built, there is substantial amounts of soft soil foundation
Need to process.Slip casting can carry out Dam Foundation Strengthened in Situ and change its intrinsic physico-mechanical properties, so it is extensive to broken ground
Being applied in civil construction project, existing filling system is many for actual grouting operation with sand slip casting, in laboratory
The research of the poor grouting in soil mass experiment of the character such as silt has certain restriction.
Since entering 21 century, intersect between subject and shown powerful competitiveness in some advanced problems of process, profit
With microorganism can grow in porous media, migrate and the characteristic such as breeding to carry out the soil body modified, be not only brand-new theory and dash forward
Break and technological innovation, and far-reaching influence will be brought to ecological environment and sustainable development.Now there are some researches show, microorganism with
Surrounding medium interphase interaction can greatly improve the macromechanical property Zhou Fangqin etc. such as soil strength, rigidity and permeability
Inquire into owing to environmental factor changes the impact on dam foundation Rock And Soil engineering properties for the microorganism of induction.Fischer etc. find bar
Family name bacillus (BacillusPasteurii) can comparatively fast separate out the precipitation of calcium carbonate with cementation in sand.But
Mostly counting the research with regard to microorganism soil mass consolidation at present to be only limitted to reinforce sand, the research reinforcing silt to microorganism is less.
But now there are some researches show and utilize microbial metabolic products to carry out engineering modification, permeability test and unconfined compressive strength to silt
Test shows that corresponding engineering objective all can significantly improve.So the Research Prospects that microorganism reinforces silt is boundless
Existing laboratory test slip casting mostly is sand slip casting experimental provision, and mostly is uniaxial pressure slip casting, there is no composite pressure note
The experimental provision of slurry is tested for silt grouting and reinforcing.Owing to soil body osmotic coefficient is relatively low, silt slip casting uses slip casing by pressure
Effect is unsatisfactory.Due to the limitation of Practical Project, the research relative difficult of the slip casting dilation angle of pressure grouting.
Content of the invention
Goal of the invention: for above-mentioned problems of the prior art and deficiency, the present invention provides a kind of one-dimensional microorganism
The device and method of grouting and reinforcing silt test, such that it is able to improve slip casting effect, accelerates the process that the soil body is processed.
Technical scheme: for achieving the above object, the technical solution used in the present invention is:
A kind of device of one-dimensional microorganism grouting and reinforcing silt test, including model groove the 4th, pressure slurry feeding device, recycling bin the 5th, water
Air separation 6 and vavuum pump 7, described pressure slurry feeding device includes Air Pressure Unit 1 and consolidating fluid bottle 3, described model groove 4
Top connect consolidating fluid bottle 3 by flexible pipe 2, consolidating fluid bottle 3 is connecting Air Pressure Unit 1, described model groove by flexible pipe 2
The bottom of 4 connects recycling bin 5 and moisture separator 6 respectively by flexible pipe 2, and described moisture separator 6 connects vavuum pump 7,
It is also associated with negative pressure control tabulation 8 on described recycling bin 5；The top of described model groove 4 is provided with cover plate 10, lower end in model groove 4
It is provided with the dividing plate 11 with several holes 13, and on dividing plate 11, be equipped with filter paper 12.
Further, described model groove the 4th, recycling bin 5 is connected by threeway 9 with moisture separator 6.
Further, described model groove 4 top is to be provided with external screw thread on outer wall, and external screw thread precession is highly 10mm, outward
Equipped with cover plate 10 on screw thread, cover plate 10 lucite bearing course thickness is 10mm, and the interior rubber sheet gasket having 2mm thick, to ensure
Sealing between model groove 4 and cover plate 10；Owing to having added rubber sheet gasket, the precession degree of depth in historical facts or anecdotes border is about 8mm.
Further, recycling bin 5 is connected by drainpipe bottom described model groove 4.
Further, the flexible pipe 2 that described consolidating fluid bottle 3 connects with Air Pressure Unit 1 and model groove 4 is provided with double
Lead to 14, and the flexible pipe 2 that consolidating fluid bottle 3 connects with Air Pressure Unit 1 stretches in consolidating fluid bottle 3.
Further, described model groove 4 is cylinder model groove.
Further, the material of described model groove 4 and dividing plate 11 is lucite.
Preferably, the intracavity diameter of described model groove 4 is 50mm, a height of 150mm；The thickness of described cover plate 10 is 20mm.
The method of a kind of one-dimensional microorganism grouting and reinforcing silt test, comprises the following steps:
Step one, first soil sample and bacterium solution are stirred, and be filled with on the filter paper 12 in model groove 4, cover tightly cover plate
10；
Step 2, model groove the 4th, pressure slurry feeding device, moisture separator 6 and vavuum pump 7 are connected by flexible pipe 2, and will reclaim
Bucket 5 is connected to the bottom of model groove 4, injects consolidating fluid in consolidating fluid bottle 3；
The pressure of step 3, regulation Air Pressure Unit 1 and negative pressure control tabulation 8 is to predetermined value；Finally open Air Pressure Unit 1
With vavuum pump 7, carry out slip casing by pressure；
Step 4, the consolidating fluid treated in flexible pipe 2 fully enter in model groove 4, close vavuum pump 7, and Air Pressure Unit 1 still keeps
Open a period of time, to ensure that after removing pressure, consolidating fluid will not reflux；
Soil sample several times, is taken out, is detected consolidation effect by step 5, repetition step three and four.
Beneficial effect: compared with prior art, the invention have the advantages that
Positive/negative pressure is all adjustable, can study the slip casting effect of different pressures slip casting, is made by the method for positive/negative-pressure combined casting
Obtaining consolidating fluid to be more evenly distributed in the soil body, consolidation effect is more uniform；Slip casting efficiency significantly improves；And simple to operate,
Convenient and practical.In view of the undesirable present situation of conventional silt slip casting effect, silt is carried out by the method that the present invention uses pressure to inhale
Slip casting, described model groove upper design one resistance to compression steel cage, bottom is provided with one block of glass with hole plate, and glass with hole plate is placed filter
Paper, thus added that vacuum pressure can be uniformly distributed in soil body lower surface below glass with hole plate.Utilize this device to powder
Soil carries out grouting and reinforcing experiment, can arrange the reality of microorganism soil mass consolidation effect under the conditions of various bacterium solution, different pressures etc.
Test；Simple, convenient and practical.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the structural representation of model groove in the present invention；
Fig. 3 is the structural representation of porous plate in the present invention；
Fig. 4 is the structural representation of consolidating fluid bottle in the present invention；
Wherein: 1-Air Pressure Unit, 2-flexible pipe, 3-consolidating fluid bottle, 4-model groove, 5-recycling bin, 6-moisture separator, 7-
Vavuum pump, the tabulation of 8-negative pressure control, 9-threeway, 10-lid, 11-dividing plate, 12-filter paper, 13-hole, 14-bilateral.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is further described.
The principle of the present invention is: under the conditions of the grouting of conventional microbiological soil mass consolidation, due to silt poor permeability, it is difficult to relatively
Grouting in the short time finishes, and causes blocking during grouting halfway, it is impossible to complete grouting.The effect of air pressure provisions for grouting is
There is provided the pressure of about 100kPa, to provide the penetration oozing under consolidating fluid so that slip casting is more quick, effectively.And vacuumize
Device then forms the negative pressure of about 80kPa in model groove 4 bottom, also can accelerate the lower infiltration rate rate of consolidating fluid, improves slip casting efficiency.
As Figure 1-4, the device of a kind of one-dimensional microorganism grouting and reinforcing silt test, including model groove the 4th, pressure is for slurry
Device, recycling bin the 5th, moisture separator 6 and vavuum pump 7, described pressure slurry feeding device includes Air Pressure Unit 1 and consolidating fluid
Bottle 3, the top of described model groove 4 connects consolidating fluid bottle 3 by flexible pipe 2, and consolidating fluid bottle 3 is connecting air pressure by flexible pipe 2
Device 1, the bottom of described model groove 4 connects recycling bin 5 and moisture separator 6 respectively by flexible pipe 2, and described aqueous vapor separates dress
Put 6 connection vavuum pumps 7, described recycling bin 5 is also associated with negative pressure control tabulation 8；The top of described model groove 4 is provided with cover plate
10, described cover plate 10 is resistance to compression steel cage, and in model groove 4, lower end is provided with the dividing plate 11 with several holes 13, and on dividing plate 11
It is equipped with filter paper 12, thus added that vacuum pressure can be uniformly distributed in soil body lower surface below apertured partition.
Described model groove the 4th, recycling bin 5 is connected by threeway 9 with moisture separator 6, by row bottom described model groove 4
Cross current recycling bin 5.
Described model groove 4 top is to be provided with external screw thread on outer wall, external screw thread precession highly be 10mm, on external screw thread equipped with
Cover plate 10, cover plate 10 lucite bearing course thickness is 10mm, and the interior rubber sheet gasket having 2mm thick, to ensure model groove 4 and lid
Sealing between plate 10；Owing to having added rubber sheet gasket, the actual precession degree of depth is about 8mm.
It is provided with bilateral 14, and glue with Air Pressure Unit 1 and model groove 4 on the flexible pipe 2 that described consolidating fluid bottle 3 connects
The flexible pipe 2 that knot liquid bottle 3 connects with Air Pressure Unit 1 stretches in consolidating fluid bottle 3.
Described model groove 4 is cylinder model groove, and the material of model groove 4 and dividing plate 11 is lucite, described model
Groove 4 bottom is separated by the poly (methyl methacrylate) plate of one piece of porous, to ensure the uniformity that bottom vacuumizes.
The intracavity diameter of described model groove 4 is 50mm, a height of 150mm；The thickness of described cover plate 10 is 20mm.
The method of a kind of one-dimensional microorganism grouting and reinforcing silt test, comprises the following steps:
Step one, the preparation of soil sample: add water by the soil sample after drying, make the soil sample that moisture content is 5%；
Step 2, bacterium solution stirring: the bacterium solution adding volume to be soil body total pore size volume 50%-80% in soil sample, stir；
Step 3, soil sample load model groove: a sheet plastic is curved cylinder, cuts into consistent with model groove 4 internal height,
And be connected fixing with filter paper adhesive tape for the bottom surface of the sheet plastic of curling, then put it in model groove 4；After bacterium solution being added
Soil sample be packed in model groove 4, often fill out the soil sample of about 3cm height, with instrument, appropriate compacting carried out to the soil body, to prevent
The rear soil body is crossed pine and is calculated required soil amount and cannot be completely filled with in model groove 4, finally covers tightly cover plate 10；
Step 4, connection equipment: pressure slurry feeding device, moisture separator 6 and vavuum pump 7 are connected by flexible pipe 2, and will reclaim
The bottom that bucket 5 is connected to model groove 4, and check an equipment and between air-tightness and firmness, due to whole pipe-line system
In all have pressure, so air-tightness is critically important, the junction of all parts and flexible pipe all should twine a circle glue band；
Step 5, inject consolidating fluid in consolidating fluid bottle 3；
Step 6, slip casting: first the first unloaded preheating of pressurization initial vacuum pump 75 minutes；Then regulate Air Pressure Unit 1 and bear
The pressure of voltage-controlled tabulation 8 is to predetermined value；Finally open Air Pressure Unit 1 and vavuum pump 7, carry out slip casing by pressure；On model groove 4
Being in the milk with air pressure in portion, bottom is to vacuumize formation negative pressure simultaneously, accelerates the lower infiltration rate rate of consolidating fluid.
Step 7, the consolidating fluid treated in flexible pipe 2 fully enter in model groove 4, close vavuum pump 7, and Air Pressure Unit 1 is still
It is held open a period of time, to ensure that after removing pressure, consolidating fluid will not reflux；
Step 8, carry out slip casting several times according to test plan after, sheet plastic is inconjunction with soil sample extract out, detection reinforce effect
Really.
In described step 3, soil sample loading model groove can also be in the following ways: filter paper is first put into model groove 4 bottom
Dividing plate 11 on, then insert in model groove after the soil body and bacterium solution are stirred, then on the soil body, put a metafiltration paper, finally tighten
Cover plate 10.
The above is only the preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For Yuan, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (8)
1. the device of an one-dimensional microorganism grouting and reinforcing silt test, it is characterised in that: include model groove (4), pressure for slurry
Device, recycling bin (5), moisture separator (6) and vavuum pump (7), described pressure slurry feeding device includes Air Pressure Unit (1)
With consolidating fluid bottle (3), the top of described model groove (4) connects consolidating fluid bottle (3) by flexible pipe (2), and consolidating fluid bottle (3) is passing through
Flexible pipe (2) connect Air Pressure Unit (1), the bottom of described model groove (4) by flexible pipe (2) connect respectively recycling bin (5) and
Moisture separator (6), described moisture separator (6) connects vavuum pump (7), and described recycling bin is also associated with negative pressure on (5)
Control table (8)；The top of described model groove (4) is provided with cover plate (10), and the interior lower end of model groove (4) is provided with several holes
(13) dividing plate (11), and it on dividing plate (11), is equipped with filter paper (12).
2. the device of one-dimensional microorganism grouting and reinforcing silt according to claim 1 test, it is characterised in that: described model
Groove (4), recycling bin (5) are connected by threeway (9) with moisture separator (6).
3. the device of one-dimensional microorganism grouting and reinforcing silt according to claim 1 test, it is characterised in that: described model
Groove (4) top is to be provided with external screw thread on outer wall, equipped with cover plate (10) on external screw thread.
4. the device of one-dimensional microorganism grouting and reinforcing silt according to claim 1 test, it is characterised in that: described model
Groove (4) bottom is by drainpipe connection recycling bin (5).
5. the device of one-dimensional microorganism grouting and reinforcing silt according to claim 1 test, it is characterised in that: described cementing
It is provided with bilateral (14), and consolidating fluid bottle with Air Pressure Unit (1) and model groove (4) on the flexible pipe (2) that liquid bottle (3) connects
(3) flexible pipe (2) connecting with Air Pressure Unit (1) stretches in consolidating fluid bottle (3).
6. the device of one-dimensional microorganism grouting and reinforcing silt according to claim 1 test, it is characterised in that: described model
Groove (4) is cylinder model groove.
7. the device of one-dimensional microorganism grouting and reinforcing silt according to claim 1 test, it is characterised in that: described model
The material of groove (4) and dividing plate (11) is lucite.
8. the method for the one-dimensional microorganism grouting and reinforcing silt test according to claim 1-7 is arbitrary, it is characterised in that bag
Include following steps:
Step one, first soil sample and bacterium solution are stirred, and be filled with on the filter paper (12) in model groove (4), cover tightly
Cover plate (10)；
Step 2, by model groove (4), pressure slurry feeding device, moisture separator (6) and vavuum pump (7) with flexible pipe (2) connect,
And recycling bin (5) is connected to the bottom of model groove (4), inject consolidating fluid in consolidating fluid bottle (3)；
The pressure of step 3, regulation Air Pressure Unit (1) and negative pressure control tabulation (8) is to predetermined value；Finally open air pressure
Device (1) and vavuum pump (7), carry out slip casing by pressure；
Step 4, the consolidating fluid treated in flexible pipe (2) fully enter in model groove (4), close vavuum pump (7), Air Pressure Unit
(1) it is still held open a period of time, to ensure that after removing pressure, consolidating fluid will not reflux；
Soil sample several times, is taken out, is detected consolidation effect by step 5, repetition step three and four.
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| CN201610467436.0A CN106153860B (en) | 2016-06-24 | 2016-06-24 | A kind of device and method of one-dimensional microorganism grouting and reinforcing silt test |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106970181A (en) * | 2017-04-07 | 2017-07-21 | 河海大学 | A kind of drainage consolidation test device and method of grouting behind shaft or drift lining slurries in the earth formation |
| CN107064472A (en) * | 2017-03-29 | 2017-08-18 | 河海大学 | The experimental rig and test method of a kind of microorganism grouting and reinforcing cylinder sand sample |
| CN107255705A (en) * | 2017-07-24 | 2017-10-17 | 河海大学 | Microorganism grouting test device and test method for uniform curing silt |
| CN108911605A (en) * | 2018-08-13 | 2018-11-30 | 重庆科技学院 | A kind of method that microorganism induction precipitation of calcium carbonate produces prefabricated drainage pipeline under subnormal ambient |
| CN109708941A (en) * | 2019-02-01 | 2019-05-03 | 贵州大学 | A kind of experimental rig and its test method solidifying the soil body for microorganism |
| CN109827823A (en) * | 2019-03-18 | 2019-05-31 | 四川农业大学 | A kind of experimental rig and application method that fluid cemented rock joint plane stage by stage can be used |
| CN109959773A (en) * | 2019-04-01 | 2019-07-02 | 合肥工业大学 | A kind of experimental rig and method demoulding microorganism grouting and reinforcing silt |
| CN110082506A (en) * | 2019-05-20 | 2019-08-02 | 南华大学 | A kind of test reaction unit and test reaction method |
| CN111334419A (en) * | 2020-03-27 | 2020-06-26 | 中山大学 | Microorganism reinforcement reaction device, system and method |
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| CN108911605A (en) * | 2018-08-13 | 2018-11-30 | 重庆科技学院 | A kind of method that microorganism induction precipitation of calcium carbonate produces prefabricated drainage pipeline under subnormal ambient |
| CN108911605B (en) * | 2018-08-13 | 2020-07-17 | 重庆科技学院 | Method for producing prefabricated drainage pipeline by microorganism-induced calcium carbonate precipitation in negative pressure environment |
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| CN109827823A (en) * | 2019-03-18 | 2019-05-31 | 四川农业大学 | A kind of experimental rig and application method that fluid cemented rock joint plane stage by stage can be used |
| CN109827823B (en) * | 2019-03-18 | 2023-10-31 | 四川农业大学 | Test device capable of adopting fluid to stage cementing rock joint surface and use method |
| CN109959773A (en) * | 2019-04-01 | 2019-07-02 | 合肥工业大学 | A kind of experimental rig and method demoulding microorganism grouting and reinforcing silt |
| CN109959773B (en) * | 2019-04-01 | 2021-07-13 | 合肥工业大学 | Test device and method for reinforcing silt through demoulding microorganism grouting |
| CN110082506A (en) * | 2019-05-20 | 2019-08-02 | 南华大学 | A kind of test reaction unit and test reaction method |
| CN111334419A (en) * | 2020-03-27 | 2020-06-26 | 中山大学 | Microorganism reinforcement reaction device, system and method |
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