CN110195431A - A kind of method that MICP combination vacuum pre-pressed joint plastic draining board reinforces deep weak soil - Google Patents
A kind of method that MICP combination vacuum pre-pressed joint plastic draining board reinforces deep weak soil Download PDFInfo
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- CN110195431A CN110195431A CN201910396744.2A CN201910396744A CN110195431A CN 110195431 A CN110195431 A CN 110195431A CN 201910396744 A CN201910396744 A CN 201910396744A CN 110195431 A CN110195431 A CN 110195431A
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- grouting pump
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- 239000002689 soil Substances 0.000 title claims abstract description 77
- 229920003023 plastic Polymers 0.000 title claims abstract description 46
- 239000004033 plastic Substances 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 35
- 101000965313 Legionella pneumophila subsp. pneumophila (strain Philadelphia 1 / ATCC 33152 / DSM 7513) Aconitate hydratase A Proteins 0.000 title claims abstract description 13
- 235000015097 nutrients Nutrition 0.000 claims abstract description 40
- 244000005700 microbiome Species 0.000 claims abstract description 26
- 239000012528 membrane Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 16
- 238000007596 consolidation process Methods 0.000 claims abstract description 12
- 230000008595 infiltration Effects 0.000 claims abstract description 6
- 238000001764 infiltration Methods 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 239000000243 solution Substances 0.000 claims description 54
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 13
- 241000193395 Sporosarcina pasteurii Species 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 8
- 239000004202 carbamide Substances 0.000 claims description 8
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 7
- 238000002347 injection Methods 0.000 claims description 7
- 239000007924 injection Substances 0.000 claims description 7
- 238000007569 slipcasting Methods 0.000 claims description 6
- 241000894006 Bacteria Species 0.000 claims description 3
- 238000005098 hot rolling Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 2
- 241000726221 Gemma Species 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 16
- 230000000694 effects Effects 0.000 description 11
- 229910000019 calcium carbonate Inorganic materials 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 230000002787 reinforcement Effects 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 230000033558 biomineral tissue development Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 4
- 229910021532 Calcite Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 235000016709 nutrition Nutrition 0.000 description 2
- 230000035764 nutrition Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 108010046334 Urease Proteins 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- 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
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- 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
Abstract
The present invention relates to a kind of methods that MICP combination vacuum pre-pressed joint plastic draining board reinforces deep weak soil, comprising: (1) is transformed to vacuum pre-pressed joint plastic draining panel assembly, increases grouting pump and conduit；(2) it is laid with sand bedding course, then is filled using medium coarse sand and is tamped with plate；(3) vacuum pre-pressed joint plastic draining panel assembly is installed, conduit connects plastic draining board bottom end and plate operation, and the closing of conduit tube head, vacuum preloading is to mud discharging consolidation；(4) grouting pump is opened, nutrient solution is flowed into plastic draining board filter membrane through conduit from bottom to up；(5) pressure for adjusting grouting pump, promotes nutrient solution to soil body infiltration of ambient；(6) after nutrient solution enters the soil body, turn off grouting pump, start vacuum pump.The present invention first passes through vacuum preloading and carries out discharging consolidation to mud, and the reinforcing stub and sand bedding course composition composite foundation for recycling microorganism to be formed along plastic draining board improve foundation strength, deformation performance, bearing capacity, the soil body allowed preferably to consolidate.
Description
Technical field
The invention belongs to reinforcement of soft soil processing technology field more particularly to a kind of utilization microorganism and vacuum preloading is combined to join
Close the method that plastic draining board carries out reinforcement of soft soil.
Background technique
Microorganism induction precipitation of calcium carbonate (Microbial induced calcite precipitation, abbreviation MICP
Technology) one of the biomineralization process that is widely present as nature.The method is by the catalytic action of microorganism in the soil body
Reaction generates precipitation of calcium carbonate and forms calcite crystal, and this calcite crystal is a kind of stable shape of calcium carbonate crystal
Formula, can fill up interstices of soil, and cementing soil particle significantly improves the strength and stiffness of soil.MICP technology has efficient, green
The advantages such as color, low cost are geotechnical engineering reinforcement techniques emerging at present.
Vacuum pre-pressed joint plastic drain board in soft soil foundation treatment, especially mud, have had and have been widely applied very much.Vacuum
Preloading method has will not make that soil body lateral extrusion, construction period are shorter, have fewer environmental impacts, economical when treating soft soil foundation
The advantages that benefit is evident.It is reinforced especially suitable for large-area soft ground, changes and be filled in blowing-filling sludge and the earthwork in road and bridge
It is a large amount of to use, it is the blowing-filling sludge processing method more commonly used at present, cost performance is high.However when soil mass consolidation sticky content compared with
Gao Shi, often effect is undesirable for simple vacuum pre-press reinforcing, and groundwork is completed in pumping often can still generate larger sedimentation.
The filter membrane silting situation of the soil body higher for sticky content, vacuum pre-pressed joint plastic draining board is more serious,
In addition, loss of vacuum causes deep soil consolidation effect bad in the vertical direction.Soft soil foundation after vacuum preloading,
Its vertical bearing capacity and deformation performance have the space further enhanced.The reason of causing the above problem is mainly: 1. vacuum pumps produce
When raw negative pressure transmits in plastic draining board, vacuum degree can be gradually decreased；2. vacuum method is in the horizontal direction true
Cycle loss is larger, and the water being unfavorable in the soil body is permeated to drain bar；3. Free water in the soil body is discharged to one by vertical drainage system
When determining degree, drainage effect gradually weakens；4. high sticky content soil is obvious to drain bar silting effect, drainage effect significantly drops
It is low.
Summary of the invention
The purpose of the present invention is to provide a kind of by MICP technology in conjunction with technique of soft soil foundation treatment, according to first precompressed micro- life again
The cured principle of object, using the drainage of vacuum preloading and the common soil mass consolidation of the mineralization of microorganism, to improve vacuum
The bearing capacity performance of precompressed groundwork soil.Present invention is mainly used for consolidated subsoil lower part muddy soft soils, while also having
Help the sand reinforced in horizontal direction.
A method of using microorganism and vacuum pre-pressed joint plastic draining board is combined to carry out deep reinforcement of soft soil, mainly
The following steps are included:
(1) vacuum pre-pressed joint plastic draining panel assembly is transformed, increases grouting pump and conduit, make nutrient solution under
And Shangdi smoothly flows into drain bar filter membrane；Vacuum pump is connected with vacuum pipe network, and vacuum pipe network is made of main pipe and branch pipe, each dry
It is connected between pipe with the pvc pipe of diameter 80mm；Grouting pump is connected with grouting pipe, and grouting pipe is soft using diameter 20mm's
Pvc pipe.Grouting pump and vacuum pump are split parallel, vacuum pipe network and slip casting pipe network independent work.
(2) it is laid with sand bedding course, sand bedding course is with a thickness of 30cm.It is filled using medium coarse sand and is tamped with plate, tamped 2~3 times, sand
Middle clay content is no more than 5% and is free of plant residue, rubbish.
(3) vacuum pre-pressed joint plastic draining panel assembly is installed, conduit connects plastic draining board bottom end and plate operation, stake
Position errors of centration control is within ± 5cm, and the error of perpendicularity is within 1%；The closing of conduit tube head, starts vacuum preloading, passes through
Vacuum preloading carries out discharging consolidation to mud；
(4) grouting pump is opened, nutrient solution is flowed into plastic draining board filter membrane to soil body depths through conduit from bottom to up
Infiltration；To enable microorganism to carry out mineralization in the deeper soil body, accelerates the consolidation of the soil body, improve the intensity of the soil body
And rigidity；
(5) according to weak soil intensity and water level, the pressure meeting that the pressure of grouting pump is generated to 70~80kpa, grouting pump is adjusted
Decay with the increase of height, the gravity of the nutrient solution on top is greater than the pressure that grouting pump provides at this time, and nutrient solution can penetrate
Plastic draining board filter membrane is to soil body infiltration of ambient；
(6) after nutrient solution is completely into the soil body, turn off grouting pump, start vacuum pump, the work for playing draining can be continued
With by water discharge extra in the soil body.With the progress of MICP process, it is short that crystalline calcium carbonate is gradually formed around drain bar
Stake, and vacuum preloading sand bedding course form compound foundation, to play the effect of further reinforcing soft ground.
Deep weak soil is usually muddy soft soil.
Basic principle of the invention are as follows: after vacuum pre-press reinforcing, utilize the vertical drainage channel of plastic draining board, grouting pump
Certain normal pressure is kept, compressing nutrient solution is permeated to soil body depths from bottom to top through filter membrane.In the positive pressure of grouting pump
Lower nutrient solution is acted on to soil body perimetric penetration, this is conducive to nutrient solution and spreads in the horizontal direction.After grouting pump stops working,
Nutrient solution can be permeated through filter membrane to soil body depths under gravity.When first time, the nutrient solution of injection enters the soil body
Afterwards, it can according to circumstances continue to inject nutrient solution, can stop injecting when reaching a certain amount of.Into the nutrition after the soil body
Liquid is conducive to the growth of microorganism in the soil body and enhances the mineralization of microorganism.It, can as needed again after to a period of time
Start vacuum pump, the air pressure in conduit is made to be negative, the water energy in the soil body is allowed to flow out again from conduit by drain bar.It is discharged to water
Afterwards, it followed by injection nutrient solution, loops back and forth like this until the intensity of weak soil reaches expected strength and stiffness.
Further, the method for step (5) pressure for adjusting grouting pump are as follows: when the amount of injection nutrient solution is drain bar
Volume 3/4ths when, stop injection nutrient solution, and keep slip casting pump work；After fully penetrated, slip casting is started again at.
Further, step (1) the conduit installation site is located at plastic draining board lower end.Conduit has good sealing
Property.The position of conduit and pore size can also be adjusted according to actual needs.
Further, the nutrient solution is that 10 DEG C of reaction solutions are prepared to obtain with 4 DEG C of Bacillus pasteurii microorganism suspensions
Mixed liquor；The wherein Bacillus pasteurii microorganism suspension OD600It is 1.628~1.821.The reaction solution is that concentration is
It according to volume ratio is that 1:1 is mixed that the calcium chloride solution and concentration of 0.25~2mol/L, which is 0.25~2mol/L urea liquid,.
Find that the strain urease-producing ability height of this reaction solution, reproduction speed are fast by Exploring Analysis many times, urea is in biodegrade
Effect is lower to generate carbanion and ammonium ion.The pH value that mud can be promoted after ammonium ion hydrolysis, in alkaline environment
Microorganism and carbanion are negatively charged, generate crystalline calcium carbonate after attracting positively charged calcium ion.Reaction solution concentration point
Not She Ji 0.25mol/L, 0.75mol/L, 1.25mol/L, 1.75mol/L, 2.25mol/L when, measure mud 3d after it is aqueous
Rate reduces 13.2%, 12.1%, 13.4%, 14%, 11.3% respectively.
Nutrient solution density of the invention is greater than the density of Free water in the soil body, and nutrient solution can be independently to soil body penetration；?
After grouting pump stops working, nutrient solution can be permeated to weak soil depths under the effect of gravity.
Further, the concentration of the calcium chloride solution and urea liquid ratio is 1:1.
Further, the volume ratio of the reaction solution and Bacillus pasteurii microorganism suspension is 20:1~10:1.
Further, the plastic draining board in the vacuum pre-pressed joint plastic draining panel assembly is whole using different fusing point hot rolling
Body formula plastic draining belt.Sectional dimension wide 100 ± 2mm, thick 4mm；Longitudinal water flowing rate > 55cm3/s；Complex stretching resistance, dry state
(when elongation percentage 10%) >=2.5KN/10cm；Filter membrane infiltration coefficient >=5 × 10-3cm/s；Filter membrane effective aperture < 0.08mm；Filter membrane
Pulling force, dry state (when elongation percentage 10%) >=25N/cm, hygrometric state when elongation percentage 15% (impregnated in water for 24 hours) >=25N/cm.Drain bar
Core plate will have corrosion resistance and sufficiently flexible, with guarantee the durability of drain bar and in Consolidation Deformation of Soil drain bar not by
It fractures or ruptures.
The present invention combines MICP technology with technique of soft soil foundation treatment, then it is solid to the soil body further to strengthen technique of soft soil foundation treatment
The effect of change, the strength and stiffness for enhancing mud and weak soil subtract so that more fully the weak soils such as silt soil be used
Few mud subsequent treatment cost and environmental pollution.
Compared with prior art, the present invention first passes through vacuum preloading and carries out discharging consolidation to mud, recycles microorganism edge
The reinforcing stub and sand bedding course that plastic draining board is formed constitute composite foundation.This approach improves traditional vacuum ground preloading weak soils
The work present situation of ground forms mini pile by MICP technology, further increases foundation strength and deformation performance.The present invention can be
It allows the soil body preferably to consolidate in 60 days, shortens construction period, overcome conventional discharge concretion method in horizontal radial Seep- Solidifying
Slow defect improves the bearing capacity of the soil body.The method is easy to operate, easily fabricated, and applicability is wide.
Detailed description of the invention
Fig. 1 is the flow chart for the method that MICP combination vacuum pre-pressed joint plastic draining board of the present invention reinforces deep weak soil；
Fig. 2 is schematic diagram when starting to inject nutrient solution；Wherein 1 is vacuum pump, and 2 be grouting pump, and 3 be conduit, and 4 be ground
Face, 5 be conduit, and 6 be plastic drain-pipe, and 7 be nutrient solution；
Fig. 3 is schematic diagram when nutrient solution is gradually spread；Wherein 1 is vacuum pump, and 2 be grouting pump, and 3 be conduit, and 4 be ground
Face, 5 be conduit, and 6 be plastic drain-pipe, and 7 be nutrient solution；
Fig. 4 is the composite foundation schematic diagram adopting the MICP crystallization stub being obtained by the present invention and sand bedding course and constituting；
Wherein 11 be plastic drain-pipe, and 22 be calcium carbonate crystal stake, and 33 be sand bedding course；
Fig. 5 is the solidification soil sample that laboratory is obtained using method of the invention；
Fig. 6 is laboratory using test specimen EDS layered image after the reinforcing of method acquisition of the invention；(a) for Si, Al, Ca,
O and C element (b) are Si element, (c) Al element, (d) Ca element, (e) O element, (f) C element；
Fig. 7 is SEM photograph after laboratory is reinforced using the soft layer that method of the invention obtains；
Fig. 8 is undrained shear strength with bacterium solution optical density OD600Relation with increase.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.
Embodiment 1
A method of using microorganism and vacuum pre-pressed joint plastic draining board is combined to carry out reinforcement of soft soil, such as Fig. 1 institute
Show, mainly comprises the steps that
(1) vacuum pre-pressed joint plastic draining panel assembly is transformed, increases grouting pump and conduit, make nutrient solution under
And Shangdi smoothly flows into drain bar filter membrane；Obtained vacuum pre-pressed joint plastic draining panel assembly such as Fig. 2 and Fig. 3 institute is transformed
Show.Plastic draining board uses different fusing point hot rolling integrated plastic drainage belt.Sectional dimension wide 100 ± 2mm, thick 4mm；Longitudinal water flowing
Rate > 55cm3/s；Complex stretching resistance, dry state (when elongation percentage 10%) >=2.5KN/10cm；Filter membrane infiltration coefficient >=5 × 10- 3cm/s；Filter membrane effective aperture < 0.08mm；Filter membrane pulling force, dry state (when elongation percentage 10%) >=25N/cm, hygrometric state (impregnate in water
For 24 hours, when elongation percentage 15%) >=25N/cm.Drain bar core plate will have corrosion resistance and sufficiently flexible, to guarantee the durable of drain bar
Property and drain bar is not broken or ruptures in Consolidation Deformation of Soil.
(2) preparation of nutrient solution: 1, Bacillus pasteurii microorganism suspension is prepared；Wherein, the Bacillus pasteurii
Microorganism suspension 600nm OD value OD600=1.628~1.821；The guarantor of the Bacillus pasteurii microorganism suspension
Depositing temperature is 4 DEG C.2, using 10 DEG C of calcium chloride solutions and 10 DEG C of urea liquid mixed configuration reaction solutions, and keeping temperature is 10
℃.Wherein, the concentration of the calcium chloride solution is 0.25~2mol/L, and the concentration of urea liquid is 0.25~2mol/L；It is described
The volume ratio of calcium chloride solution and urea liquid is 1:1, and concentration ratio is 1:1.3,10 DEG C of reaction solutions and 4 DEG C of Bacillus pasteuriis are taken
Microorganism suspension is prepared to obtain mixed liquor i.e. nutrient solution；Wherein, the reaction solution and Bacillus pasteurii microorganism suspension
Volume ratio be 20:1~10:1.
(3) conduit connection plastic draining board bottom end and plate operation, the closing of conduit tube head, start vacuum preloading, and vacuum is pre-
Grouting pump is installed after pressure, nutrient solution is then flowed into plastic draining board by conduit from bottom to up, when injection nutrient solution
Amount when being 3/4ths of drain bar volume, the pressure of grouting pump to 70~80kpa at this time stops injection, and keeps slip casting
Pump work；State of the nutrient solution in drain bar is as shown in Figure 2 at this time.After fully penetrated, slip casting is started again at, at this time nutrition
Liquid can be gradually to soil body external diffusion, and state is as shown in Figure 3.Vacuum pump can be started as needed, made in drain bar using negative pressure
Nutrient solution liquid level is promoted to plate top and prevents excessive horizontal proliferation.After nutrient solution is completely into the soil body, turn off grouting pump, opens
Dynamic vacuum pump, can continue to play the role of draining, and water extra in the soil body is discharged.With the progress of MICP process, arranging
Crystalline calcium carbonate stub is gradually formed around water plate, with vacuum preloading sand bedding course form compound foundation, is further added to play
Gu the effect of soft soil foundation, as shown in Figure 4.Fig. 5 is the solidification soil sample that laboratory is obtained using method of the invention.From Fig. 6
With Fig. 7 it can be seen that foring crystalline calcium carbonate using the solidification soil sample that method of the invention obtains.
It is compound along plastic draining board formation reinforcing stub and sand bedding course composition that microorganism is obtained using the method for the present embodiment
Ground enhances the overall stability of vacuum preloading groundwork, and the soil body of ground lower part is more closely knit, as shown in fig. 7, can mention
The bearing capacity performance of high vacuum precompressed groundwork soil.Both the soil body can generate differential settlement after having overcome vacuum preloading
Defect, and enhance the consolidation effect of vacuum preloading in the horizontal direction.
Embodiment 2
Bacillus pasteurii microorganism suspension 600nm OD value OD600With the exploration of undrained shear strength relationship
Bacillus pasteurii microorganism suspension 600nm OD value OD600Take different value, other conditions with embodiment 1,
Undrained shear strength is obtained with bacterium solution optical density OD600Relation with increase it is as shown in Figure 8.
Embodiment 3
The discussion of the relationship of the concentration and moisture content of reaction solution
Reaction solution concentration separately designs 0.25mol/L, 0.75mol/L, 1.25mol/L, 1.75mol/L, 2.25mol/L,
Other conditions with embodiment 1, the moisture content after measuring mud 3d reduces 13.2% respectively, 12.1%, 13.4%, 14%,
11.3%.
Obviously, the above embodiment of the present invention is just for the sake of clearly illustrating examples made by the present invention, and being not is pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (7)
1. a kind of method that MICP combination vacuum pre-pressed joint plastic draining board reinforces deep weak soil, which is characterized in that main packet
Include following steps:
(1) vacuum pre-pressed joint plastic draining panel assembly is transformed, increases grouting pump and conduit, makes nutrient solution from bottom to top
Ground smoothly flows into drain bar filter membrane；
(2) it is laid with sand bedding course, then is filled using medium coarse sand and is tamped with plate, is tamped 2~3 times；
(3) vacuum pre-pressed joint plastic draining panel assembly is installed, conduit connects plastic draining board bottom end and plate operation；Catheter tube
Head closing, starts vacuum preloading, carries out discharging consolidation to mud by vacuum preloading；
(4) grouting pump is opened, nutrient solution is flowed into plastic draining board filter membrane through conduit from bottom to up and is permeated to soil body depths；
(5) according to weak soil intensity and water level, the pressure of grouting pump is adjusted to 70~80kpa, makes nutrient solution through plastic draining board
Filter membrane is to soil body infiltration of ambient；
(6) after nutrient solution is completely into the soil body, turn off grouting pump, start vacuum pump, water extra in the soil body is discharged.
2. method according to claim 1, which is characterized in that step (4) pressure for adjusting grouting pump to 70~80kpa
Method are as follows: when the amount for injecting nutrient solution is 3/4ths of drain bar volume, stops injection nutrient solution, and keep grouting pump
Work；After fully penetrated, slip casting is started again at.
3. method according to claim 1, which is characterized in that step (1) the conduit installation site is located at plastic draining board
Lower end.
4. method according to claim 1, which is characterized in that the nutrient solution is 10 DEG C of reaction solutions and 4 DEG C of Pasteur's gemma bars
Bacteria microorganism suspension is prepared to obtain mixed liquor；The wherein Bacillus pasteurii microorganism suspension OD600For 1.628~
1.821, the reaction solution is the calcium chloride solution that concentration is 0.25~2mol/L and concentration is 0.25~2mol/L urea liquid
It is mixed according to volume ratio for 1:1.
5. method according to claim 4, which is characterized in that the concentration of the calcium chloride solution and urea liquid ratio is 1:1.
6. method according to claim 4, which is characterized in that the reaction solution and Bacillus pasteurii microorganism suspension
Volume ratio is 20:1~10:1.
7. method according to claim 1, which is characterized in that the plastics in the vacuum pre-pressed joint plastic draining panel assembly
Drain bar uses different fusing point hot rolling integrated plastic drainage belt.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111945735A (en) * | 2020-08-21 | 2020-11-17 | 西南石油大学 | Microorganism alternate grouting device for soft soil solidification and use method |
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| JP2007309055A (en) * | 2006-05-22 | 2007-11-29 | Kurose Aiko | Soft-ground reinforcement method |
| JP2012092648A (en) * | 2012-02-03 | 2012-05-17 | Taisei Corp | Microbe-based soil improvement method |
| CN105649003A (en) * | 2016-01-11 | 2016-06-08 | 河海大学 | Reinforcing device for reinforcing sand foundation through combination of microorganisms with vacuum drainage and reinforcing method of reinforcing device |
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| CN111945735B (en) * | 2020-08-21 | 2021-11-30 | 西南石油大学 | Microorganism alternate grouting device for soft soil solidification and use method |
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