CN104452740B - A kind of method of Reinforcement liquefaction sand foundation - Google Patents
A kind of method of Reinforcement liquefaction sand foundation Download PDFInfo
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- CN104452740B CN104452740B CN201410671469.8A CN201410671469A CN104452740B CN 104452740 B CN104452740 B CN 104452740B CN 201410671469 A CN201410671469 A CN 201410671469A CN 104452740 B CN104452740 B CN 104452740B
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- sand foundation
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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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Abstract
The present invention is a kind of method of Reinforcement liquefaction sand foundation, imbeds some drain pipies on the sandy soils to be reinforced of sand foundation, and the surrounding of every drain pipe is embedded with some feed tubes, and the upper end of some feed tubes is connected with liquid reservoir is reinforced by booster pump；The upper end of some drain pipies is connected with vacuum pump by conduit；When reinforcing operation：Will reinforce liquid injection reinforce liquid reservoir, start vacuum pump and increase pump, in sand foundation produce pressure differential, reinforce liquid by feed tube flow into sand foundation in, and with sand foundation in water together from drain pipe discharge, such repeatable operation until reinforcing complete.By the present invention in that reinforce liquid with microorganism reinforcing to sand foundation, which reinforces liquid good fluidity, can go deep into inside sand foundation, increases sand foundation degree of compaction, improves ground liquefaction stress；In addition reinforcement means is simple, the depth depth of reinforcing, and little to surrounding enviroment and effect of adjoining buildings.
Description
Technical field
The present invention relates to a kind of foundation treatment technology in Geotechnical Engineering field, is more particularly to reinforced using microbial mineralization and is controlled
The method of reason liquefaction sand foundation.
Background technology
Sand foundation includes subjacent bed, sandy soils to be reinforced and upper strata overburden layer, the destruction of the liquefaction of sand to structures
It is very serious, easily causes great loss.At present, for the anti-seismic treatment method of liquified sand foundation mainly has by force
Rammer method, vibro-replacement stone column method and sand compaction pile method etc..And the use of these methods has some limitations, such as heavy-tamping method
Influence depth is limited, typically can only achieve 10m or so；And vibrating macadam pile method has greater environmental impacts, and basement process cost
Higher.
Content of the invention
The technical problem to be solved is for the deficiencies in the prior art, there is provided a kind of method is simple, operation side
The method of Reinforcement liquefaction sand foundation just.
The technical problem to be solved is realized by following technical scheme.The present invention is a kind of reinforcing
The method for administering liquefaction sand foundation, is characterized in, imbeds some drain pipies on the sandy soils to be reinforced of sand foundation, per
The surrounding of root drain pipe is embedded with the distance between some feed tubes, adjacent two feed tubes for 3-4m, in sand to be reinforced
The length of the feed tube in layer is 10-20cm, and the drain pipe in sandy soils to be reinforced is above sand foundation subjacent bed
Distance is 20-30cm；The upper end of some feed tubes is connected with booster pump by conduit, and booster pump is connected with liquid reservoir is reinforced；
The upper end of some drain pipies is connected with vacuum pump by conduit；When reinforcing operation：Liquid injection will be reinforced and reinforce liquid reservoir, be started
Vacuum pump and booster pump, produce pressure differential in sand foundation, reinforce liquid and are flowed in sand foundation, and with sand by feed tube
Water in ground is discharged from drain pipe together, and such repeatable operation is completed until reinforcing；Finally remove on drain pipe and feed tube
Conduit, and drain pipe and feed tube are filled and led up with coarse granule sand.
In the method for Reinforcement liquefaction sand foundation of the present invention, some feed tubes arrangement is rectangular,
Square, rhombus or triangle.
In the method for Reinforcement liquefaction sand foundation of the present invention, the drain pipe and feed tube are pvc pipe,
Bore is 5cm, wall thickness 4-6mm.
In the method for Reinforcement liquefaction sand foundation of the present invention, the bottom of feed tube is equipped with a diameter of 8-10cm
Spherical diffusion tip, be uniformly provided with some liquid outlets, a diameter of 4-6mm of liquid outlet on spherical diffusion tip.
In the method for Reinforcement liquefaction sand foundation of the present invention, drain pipe in sandy soils to be reinforced
Tube wall is provided with some inlet openings, the percent opening of the percent opening of drain pipe bottom more than drain pipe top, all inlet openings total
Area is provided with the filter membrane for covering some inlet openings on the outer wall of drain pipe less than the cross-sectional area of drain pipe.
In the method for Reinforcement liquefaction sand foundation of the present invention, the reinforcing liquid with water as solvent and contains calcium
Ion, carbamide and urea bacterium；Wherein：The mass concentration of carbamide is 15-90g/L, the quantity of carbon atom in calcium ion and carbamide
Than for 0.7 ~ 1.5:1, the concentration of urea bacterium is 108~1010Individual/L；And the pH of reinforcing liquid is 5.0 ~ 7.0.
In the method for Reinforcement liquefaction sand foundation of the present invention, described calcium ion from soluble calcium salt,
Including calcium chloride or calcium nitrate.
In the method for Reinforcement liquefaction sand foundation of the present invention, in the reinforcing liquid also containing mass concentration it is
The nutrient substance of the confession bacterial growth breeding of 5 ~ 75 g/L.
In the method for Reinforcement liquefaction sand foundation of the present invention, described nutrient substance is selected from 5 ~ 30 g/L
Yeast extract, the beef powder of 3 ~ 20g/L, the one kind in the Mannitol of 10 ~ 50g/L or the soy peptone of 10 ~ 40g/L or
Multiple.
In the method for Reinforcement liquefaction sand foundation of the present invention, the urea bacterium is that Pasteur's life spore eight folds ball
Bacterium（Sporosarcina pasteurii）CGMCC No. 1.3687；Or ground carbamide bacillus cereuss（Ureibacillus
terrenus）CGMCC No. 1.7272.
Bacterial strain Pasteur life spore sarcina involved in the present invention（Sporosarcina pasteurii）It is deposited in China
Microbiological Culture Collection administration committee common micro-organisms center CGMCC, deposit number are CGMCC No. 1.3687；Preservation list
Bit address：Datun Road, Chaoyang District, Beijing City Institute of Microorganism, Academia Sinica, phone：010-64807355.
Bacterial strain ground carbamide bacillus cereuss involved in the present invention（Ureibacillus terrenus）It is deposited in Chinese micro- life
Thing culture presevation administration committee common micro-organisms center CGMCC, deposit number are CGMCC No. 1.7272；Depositary institution ground
Location：Datun Road, Chaoyang District, Beijing City Institute of Microorganism, Academia Sinica, phone：010-64807355.
In the method for Reinforcement liquefaction sand foundation of the present invention, the preparation process for reinforcing liquid is as follows：
（1）It is standby after urea bacterium is cultivated according to a conventional method；
（2）0.25-1.5mol calcium chloride or calcium nitrate, the carbamide of 0.25-1.5mol is added in every liter of deionized water；
Add nutrient substance on demand again, dissolve mix homogeneously；
（3）It is 10 by the concentration of urea bacterium8~1010Individual/L is added thereto to urea bacterium；Obtain final product reinforcing liquid.
For first preparing fluid medium, the preparation method of fluid medium is the conventional method of urea bacterium, by 20g yeast
Cream, 10g ammonium sulfate are dissolved in 1000ml deionized waters, and then with alkaline buffer adjustment pH value to 9.0, then High Temperature High Pressure is gone out
Bacterium.
Then antibacterial culturing is carried out, and method is（1）Inoculation：25ml culture fluid is added in culture tube, is added with liquid-transfering gun
250ul strains；（2）Culture：It is placed on shaking table and shakes up 40h；（3）Outwell waste liquid after centrifugation, then plus 25ml culture medium, shake up.Training
After supporting, concentration is about 109Individual/ml (order of magnitude, i.e. 1-9*), antibacterial are preserved:4 degree of Refrigerator stores.
1.0mol calcium chloride or calcium nitrate, the carbamide of 0.8mol is added in every liter of deionized water；Add on demand again
Nutrient substance, dissolves mix homogeneously；It is 10 by the concentration of urea bacterium8~1010Individual/L is added thereto to urea bacterium；Obtain final product plus
Solid-liquid.
Reinforce the operation principle of liquid：
Antibacterial+Ca2+→ antibacterial-Ca2+(1)
Antibacterial life produces urease
Carbamide enzyme catalysiss CO (NH2)2+ 2H2O → CO3 2-+ 2NH4 +(2)
Antibacterial-Ca2++ CO3 2-→ antibacterial-CaCO3(3)
The Calcium Carbonate of generation is based on calcite, with cementing properties.
Compared with prior art, sand foundation is reinforced by the present invention in that reinforcing liquid with microorganism, which reinforces liquid
Good fluidity, can go deep into inside sand foundation, increase sand foundation degree of compaction, improve ground liquefaction stress；Other reinforcing side
Method is simple, the depth depth of reinforcing, and little to surrounding enviroment and effect of adjoining buildings.
Description of the drawings
Fig. 1 is a kind of leak stopping structure schematic diagram of the invention.
Fig. 2 is the arrangement schematic diagram of drain pipe and feed tube.
Specific embodiment
The concrete technical scheme of the present invention described further below, is further understood that in order to those skilled in the art
The present invention, and do not constitute the restriction to its right.
Embodiment 1, a kind of method of Reinforcement liquefaction sand foundation, as depicted in figs. 1 and 2, treating in sand foundation
Reinforce, on sandy soils 7, some drain pipies 1 are imbedded using bore mode, the surrounding of every drain pipe 1 is embedded with some feed tubes
5, some feed tubes 5 are arranged into rectangle as shown in Figure 2.The drain pipe 1 and feed tube 5 are pvc pipe, bore
For 5cm, wall thickness 5mm.Spherical diffusion tip 9 of the bottom of every feed tube 5 equipped with a diameter of 9cm, uniformly sets on spherical diffusion tip 9
There are some liquid outlets, a diameter of 5mm of liquid outlet.The tube wall of the drain pipe 1 in the sandy soils to be reinforced 7 be provided with some enter
Fluid apertures, liquid outlet gradually increases drain pipe 1 from top to bottom, and aperture should carry out respective design, all inlet openings according to sand particle diameter
The gross area less than drain pipe 1 cross-sectional area, cross-sectional area is 19.6cm2, covering is provided with the outer wall of drain pipe 1
The filter membrane of some inlet openings.Gushing out for silt in drainage procedure can be prevented, its material and characteristic can refer to engineering draining
Plate filter membrane.
The distance between adjacent two feed tubes 5 are 3.5m, and the length of the feed tube in sandy soils to be reinforced 7 is
15cm, distance of the drain pipe 1 in sandy soils to be reinforced 7 above sand foundation subjacent bed 8 are 25cm.Some feed liquors
The upper end of pipe 5 is connected with booster pump 3 by conduit, and booster pump 3 is connected with liquid reservoir 4 is reinforced；The upper end of some drain pipies 1 leads to
Cross conduit to be connected with vacuum pump 2.
When reinforcing operation：Liquid injection will be reinforced and reinforce liquid reservoir 4, and be started vacuum pump 2 and booster pump, produce in sand foundation
Pressure differential, reinforce liquid by feed tube 5 flow into sand foundation in, and with sand foundation in water discharge from drain pipe 1 together,
So repeatable operation is completed until reinforcing；Drain pipe 1 and conduit feed tube 5 on are finally removed, and will be at the top of upper mantle rock 6
Above feed tube 5 is cut off with drain pipe 1, and is filled and led up remaining drain pipe 1 and feed tube 5 with coarse granule sand.
Booster pump 3 and the main purpose that vacuum pump 2 is used are to make to produce pressure differential in sand foundation so as to forming reinforcing liquid
Circulation passage, therefore pressure size can voluntarily be adjusted according to engine request.From cost-effective angle, booster pump 3 with
The pressure value of vacuum pump 2 is unsuitable excessive, is defined by forming circulation passage.
Embodiment 2, method as described in Example 1, the reinforcing liquid as solvent and contain calcium ion, carbamide and urine with water
Plain antibacterial；Wherein：The mass concentration of carbamide is 50g/L, and calcium ion is 1 with the quantity ratio of carbon atom in carbamide:1, urea bacterium
Concentration be 108~1010Individual/L；And the pH of reinforcing liquid is 5.5 ~ 6.5.
Embodiment 3, method as described in Example 2, described calcium ion from soluble calcium salt, including calcium chloride or nitre
Sour calcium.
Embodiment 4, method as described in Example 2：Also thin for the confession of 60 g/L containing mass concentration in the reinforcing liquid
The nutrient substance of bacteria growing breeding.
Embodiment 5, method as described in Example 4, described nutrient substance are selected from the yeast extract of 20 g/L, 12g/L
Beef powder, one or more in the Mannitol of 30g/L or the soy peptone of 25g/L.
Embodiment 6, the method as described in embodiment 2-5, the urea bacterium are that Pasteur gives birth to spore sarcina
（Sporosarcina pasteurii）CGMCC No. 1.3687；Or ground carbamide bacillus cereuss（Ureibacillus
terrenus）CGMCC No. 1.7272.
Embodiment 7, the method as described in embodiment 1-6, the preparation process of the reinforcing liquid are as follows：
（1）It is standby after urea bacterium is cultivated according to a conventional method；
（2）0.8mol calcium chloride or calcium nitrate, the carbamide of 0.8mol is added in every liter of deionized water；Add on demand again
Enter nutrient substance, dissolve mix homogeneously；
（3）It is 10 by the concentration of urea bacterium8~1010Individual/L is added thereto to urea bacterium；Obtain final product reinforcing liquid.
Claims (6)
1. a kind of method of Reinforcement liquefaction sand foundation, it is characterised in that bury on the sandy soils to be reinforced of sand foundation
Enter some drain pipies, the surrounding of every drain pipe is embedded with the distance between some feed tubes, adjacent two feed tubes for 3-
4m, the length of the feed tube in sandy soils to be reinforced is 10-20cm, and the drain pipe in sandy soils to be reinforced is away from sand
Distance above foundation soft sublayer is 20-30cm；The upper end of some feed tubes is connected with booster pump by conduit, booster pump with
Reinforce the connection of liquid reservoir；The upper end of some drain pipies is connected with vacuum pump by conduit；When reinforcing operation：Liquid injection will be reinforced
Liquid reservoir is reinforced, starts vacuum pump and booster pump, pressure differential is produced in sand foundation and forms the circulation passage for reinforcing liquid, reinforce liquid
Flowed in sand foundation by feed tube, and with sand foundation in water discharge from drain pipe together, such repeatable operation is straight
Complete to reinforcing；Drain pipe and the conduit on feed tube is finally removed, and drain pipe and feed tube is filled and led up with coarse granule sand；
Spherical diffusion tip of the bottom of feed tube equipped with a diameter of 8-10cm, is uniformly provided with some liquid outlets, goes out liquid on spherical diffusion tip
A diameter of 4-6mm in hole；The tube wall of the drain pipe in sandy soils to be reinforced is provided with some inlet openings, drain pipe bottom
Percent opening of the percent opening more than drain pipe top, the gross area of all inlet openings are less than the cross-sectional area of drain pipe, in draining
The outer wall of pipe is provided with the filter membrane for covering some inlet openings；Described reinforcing liquid with water as solvent and contain calcium ion, carbamide and
Urea bacterium；Wherein：The mass concentration of carbamide is 15-90g/L, the quantity ratio of calcium ion and carbon atom in carbamide is 0.7 ~
1.5:1, the concentration of urea bacterium is 108~1010Individual/L；And the pH of reinforcing liquid is 5.0 ~ 7.0.
2. the method for Reinforcement liquefaction sand foundation according to claim 1, it is characterised in that some feed liquors
Bank of tubes cloth squarely, rhombus or triangle.
3. the method for Reinforcement liquefaction sand foundation according to claim 1, it is characterised in that the drain pipe and enter
Liquid pipe is pvc pipe, and bore is 5cm, wall thickness 4-6mm.
4. the method for Reinforcement liquefaction sand foundation according to claim 1, it is characterised in that：Described calcium ion comes
From soluble calcium salt, including calcium chloride or calcium nitrate.
5. the method for Reinforcement liquefaction sand foundation according to claim 1, it is characterised in that：In the reinforcing liquid also
Containing the nutrient substance that the confession bacterial growth that mass concentration is 5 ~ 75 g/L is bred.
6. the method for Reinforcement liquefaction sand foundation according to claim 5, it is characterised in that：Described nutrient substance
Yeast extract, the soybean protein of the beef powder, the Mannitol of 10 ~ 50g/L or 10 ~ 40g/L of 3 ~ 20g/L selected from 5 ~ 30 g/L
One or more in peptone.
The method of the 7 Reinforcement liquefaction sand foundations according to any item of claim 4-6, it is characterised in that the urine
Plain antibacterial is that Pasteur gives birth to spore sarcina（Sporosarcina pasteurii）CGMCC No. 1.3687；Or ground carbamide bud
Spore bacillus（Ureibacillus terrenus）CGMCC No. 1.7272.
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| CN201410671469.8A CN104452740B (en) | 2014-11-21 | 2014-11-21 | A kind of method of Reinforcement liquefaction sand foundation |
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| CN105220681A (en) * | 2015-10-26 | 2016-01-06 | 南京林业大学 | A kind of method of microorganism-electric field joint reinforcement Liquefaction Foundation |
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| JP2630587B2 (en) * | 1986-03-04 | 1997-07-16 | 日東化学工業株式会社 | Grout injection method |
| CN101215833A (en) * | 2008-01-15 | 2008-07-09 | 同济大学 | Gas injection type vacuum precipitation method |
| CN100596319C (en) * | 2008-09-19 | 2010-03-31 | 东南大学 | Earth solidification method by using carbonate mine |
| CN101644047A (en) * | 2009-07-23 | 2010-02-10 | 东南大学 | Method of adhering loose sands employing microbial mineralization |
| JP2012112103A (en) * | 2010-11-20 | 2012-06-14 | Maruyama Kogyo Kk | Soft ground improvement method |
| CN102604641A (en) * | 2012-02-17 | 2012-07-25 | 水利部交通运输部国家能源局南京水利科学研究院 | Microorganism reinforcing fluid for slope strengthening and using method thereof |
| CN102677683A (en) * | 2012-04-13 | 2012-09-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Environment-friendly type microorganism-plant combined slope protection method |
| CN103031835B (en) * | 2012-12-28 | 2014-11-12 | 宁波高新区围海工程技术开发有限公司 | Method for increasing foundation bearing capacity |
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