CN110241809A - A kind of microorganism reinforces the curing agent and its reinforcement means of cohesiveless soil - Google Patents
A kind of microorganism reinforces the curing agent and its reinforcement means of cohesiveless soil Download PDFInfo
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- CN110241809A CN110241809A CN201910555665.1A CN201910555665A CN110241809A CN 110241809 A CN110241809 A CN 110241809A CN 201910555665 A CN201910555665 A CN 201910555665A CN 110241809 A CN110241809 A CN 110241809A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
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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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
Abstract
The invention discloses curing agent and its reinforcement means that a kind of microorganism reinforces cohesiveless soil, the curing agent includes solution A, solution B and solution C, and the solution A is the mixed solution that anaerobic ammonia oxidizing bacteria solution, urea liquid and nitrous acid calcium solution are formed；The solution B is Bacillus pasteurii solution；The solution C is the mixed solution of saleratus, potassium dihydrogen phosphate, magnesium sulfate, calcium chloride and ferrous sulfate.Cohesiveless soil is solidified using the curing agent, the ammonium ion in cohesiveless soil can be effectively reduced, while generating nitrogen, the saturation degree for lowering the soil body improves solidification effect.
Description
Technical field
The present invention relates to the field of building materials, and in particular to a kind of microorganism reinforces curing agent and its reinforcing of cohesiveless soil
Method.
Background technique
The argillaceous grain of cohesiveless soil is less, and water penetration is larger, is one of most common rock soil medium in civil engineering.Nothing
Cohesive soil easily destroys under load or seepage effect without intrinsic cohesive strength, and the most common destruction case is geological process
The liquefaction phenomenon of lower sand.In recent years it has been confirmed that sand, silt, gravel soil may liquefy, anti-liquefaction will become anti-
Shake a most important ring in Disaster Prevention Design.Cohesiveless soil caused by seepage flow is when foundation pit tunnel excavation, pile foundation engineering are constructed
Drift sand, collapse hole phenomenon are also common operating risk；Dam piping is also due to cohesiveless soil and is taken away and caused by water flow.So
Improving the intrinsic cohesive strength of cohesiveless soil is to prevent the most effective means of cohesiveless soil correlation engineering accident.
The reinforcement means of cohesiveless soil is based on slip casting at present, including all kinds of chemical groutings, high polymer grouting, cement injection
Deng.However due to the viscosity of slurries, this kind of injecting paste material treatment effect is limited, while some injecting paste materials are also possible to underground
Water pollutes.
In recent years, microorganism soil mass consolidation causes the extensive concern of academia because of the characteristics of its environmentally friendly low-carbon, conventional
The solution that microorganism reinforcement means uses includes the bacterium solution formed Bacillus pasteurii and made of urea and calcium chloride
Mixed liquor.Precipitation of calcium carbonate is generated by the way that bacterium solution and mixed liquor are sequentially added the soil body to block soil body hole, cementing sand grains
Achieve the purpose that improve soil strength.
Although the technical application range is very wide, but fail to obtain large-scale promotion application at present.Such as Van Paassen
It attempts for Bacillus pasteurii induction precipitation of calcium carbonate to be used in the foundation treatment engineering of horizontal directional drill gravel layer, testing result
There are a large amount of ammonia roots to be detained for stabilization zone after the completion of display processing；Edward S.Kuclfarskb has applied in 2007 by urea water
Solution bacterium and calcium urea Ar ion mixing form the patent (US8182604) of adhesive bond in permeable material, and Dutch Deltares is public
It takes charge of the power of popularizations in 10 years having purchased and but has no line of trade, main reason is that the ammonia generated after reaction may make underground water
At pollution.Many studies have shown that the ammonium ion and water eutrophication in water body are closely related.The presence of ammonium ion hinders
How the application of this method decreases or even eliminates the ammonia root generated after the completion of reinforcing, industry at present and academia there has been no compared with
Good processing method.
Summary of the invention
In view of the above shortcomings of the prior art, the object of the invention is that provide it is a kind of can be effectively reduced it is inviscid
Ammonium ion in soil, while nitrogen is generated, the saturation degree for lowering the soil body improves the microorganism reinforcing cohesiveless soil of solidification effect
Curing agent and its reinforcement means.
The technical scheme of the present invention is realized as follows:
A kind of microorganism reinforces the curing agent of cohesiveless soil, including solution A, solution B and solution C, and the solution A is anaerobism
The mixed solution that ammonia oxidation bacteria solution, urea liquid and nitrous acid calcium solution are formed；The solution B is that Bacillus pasteurii is molten
Liquid；The solution C is the mixed solution of saleratus, potassium dihydrogen phosphate, magnesium sulfate, calcium chloride and ferrous sulfate.
Further, the molar concentration of nitrous acid calcium solution is equal in the solution A, and the molar concentration be 10~
100mmol/L。
Further, the OD of the Bacillus pasteurii solution600Greater than 2.
Further, in solution C the concentration of each component be respectively as follows: 2~5g/L of saleratus, potassium dihydrogen phosphate 40~
70mg/L, 200~500mg/L of magnesium sulfate, 200~500mg/L of sodium chloride, 8~15mg/L of ferrous sulfate.
Further, the anaerobic ammonia oxidizing bacteria solution is the solution that anaerobic ammonium oxidation sludge particle is dissolved in water formation.
A kind of reinforcement means of cohesiveless soil, specifically includes the following steps:
(1) prospecting obtains the thickness of depth h and inviscid soil layer of cohesiveless soil layer the to be reinforced upper surface apart from ground surface
Spend s；
(2) standby by a kind of mentioned-above curing agent preparation solution A, solution B and solution C that microorganism reinforces cohesiveless soil
With；
(3) if the ground surface in cohesiveless soil layer to be reinforced bores dry-well vertically downward, all wells are by 1.5~2m of spacing and are in
Matrix form is uniformly distributed, and all wells are divided into slip casting well and pumped well, is pumped well around the slip casting well, around pumped well
For slip casting well；And steel floral tube is inserted into each well, the length l of steel floral tube insertion underground is
(4) Grouting Pipe and drinking-water pipe be installed respectively in the slip casting well and pumped well in step (3), the one of the Grouting Pipe
End is connect with the steel floral tube in slip casting well, and the other end is connect with grouting equipment；The steel floral tube in pumped well is inserted into drinking-water pipe one end
Interior, the other end is connect with pumping equipment；
(5) slip casting and reinforcing:
5.1) it first time slip casting: after the grouting equipment in step (4) is connected to solution A and solution C, opens slip casting and sets
Standby, solution A and solution C are that 1:9 is injected into slip casting well, while opening pumping equipment by volume, by the solution I in pumped well
Extraction, and calcium ion concentration in solution I is checked in time, when calcium ion concentration is greater than 60mg/L in solution I, stops pumping and infuse
Slurry, and stand 3h；
After grouting equipment is connected to solution B, grouting equipment is opened, solution B is injected into slip casting well, while opening and drawing water
Solution II in pumped well is extracted out, while detecting OD in solution II by equipment600Value, with underground water OD600Value is blank sample, if
It measures solution II and subtracts the OD after blank sample600Value is greater than 0.1, stops pumping and slip casting, and stands 24~48h；
5.2) second of slip casting: repeating step 5.1), and the volume ratio of solution A and solution C is 1:4 during this time slip casting；
5.3) third time slip casting: repeating step 5.1), and the volume ratio of solution A and solution C is 1:1 during this time slip casting；
5.4) the 4th time and with grouting behind shaft or drift lining: repeating step 5.3)；
The calcium carbonate content in cohesiveless soil layer to be reinforced is detected after each slip casting, when detecting cohesiveless soil layer to be reinforced
In calcium carbonate content be more than or equal to setting value when, then complete the reinforcing of the inviscid soil layer in slip casting well corresponding region.
Further, the vertical error of wellbore construction plane is less than or equal to 80cm in step (3).
Further, when injecting solution A and solution C in step (5) into slip casting well, the grouting pressure of grouting equipment is set
For 100~300KPa；When injecting solution B, the grouting pressure that grouting equipment is arranged is 10~100KPa.
Further, the setting value of calcium carbonate content is 10Kg/m in step (5)3。
Further, calcium carbonate content calculates as follows in inviscid soil layer in step (5):
Wherein: the number of n- repetition slip casting；
The molar concentration of urea, mmol/L in A- solution A；
M- calcium carbonate content, Kg/m3。
Compared with prior art, the invention has the following beneficial effects:
1, hydrolysis of urea is ammonium ion and carbanion by Bacillus pasteurii of the present invention, in anaerobic ammonia oxidizing bacteria
Under effect, ammonium ion and nitrite ion reaction generate nitrogen, effectively prevent ammonium ion polluted underground water, produce simultaneously
The saturation degree that raw nitrogen advantageously reduces sand improves soil body liquefaction stress；And carbanion and calcium ion reaction generate
Calcium carbonate solidifies cohesiveless soil, will not generate secondary pollution.
2, the curing agent that the present invention uses reduces cohesiveless soil by generating calcarinate cohesiveless soil and generating nitrogen
Saturation degree handles cohesiveless soil, and the uniformity coefficient of reinforcing can be improved in more traditional microorganism reinforcement means, reduces and reinforces
The generation of by-product ammonia, while the saturation degree of inviscid soil layer is reduced, facilitate earthquake liquefaction prevention and treatment.
Detailed description of the invention
The inviscid soil layer ruggedized construction schematic diagram of Fig. 1-present invention.
The inviscid soil layer of Fig. 2-present invention reinforces schematic cross-sectional view.
Wherein: 1- slip casting well；2- pumped well.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and detailed description.
A kind of microorganism reinforces the curing agent of cohesiveless soil, including solution A, solution B and solution C, and the solution A is anaerobism
The mixed solution that ammonia oxidation bacteria solution, urea liquid and nitrous acid calcium solution are formed；The solution B is that Bacillus pasteurii is molten
Liquid；The solution C is the mixed solution that saleratus, potassium dihydrogen phosphate, magnesium sulfate, calcium chloride and ferrous sulfate are formed.
Bacillus pasteurii is the alkaliphilic bacterium being rich in a kind of soil, and under the adverse circumstances such as soda acid, high salinity
Stronger bioactivity can be kept, a large amount of high activity urase can be generated by metabolic activity using urea as the energy, it will
Hydrolysis of urea generates NH4 +And CO3 2-, in the presence of calcium nitrite, the special cell wall structure of Bacillus pasteurii,
Ca is adsorbed with a large amount of anion groups in surface2+, Bacillus pasteurii is by life activity by CO3 2-It transports thin
Cellular surface and Ca2+In conjunction with formation calcium carbonate crystal；And NH4 +Under the action of anaerobic ammonia oxidizing bacteria, the nitrous acid in anaerobic environment
NO in calcium2 -Ion is by NH4 +It is oxidized to nitrogen, nitrogen further decreases the saturation degree of the soil body, improves consolidation effect.Anti- raw is anti-
Answer formula as follows:
CO(NH2)2+2H2O→2NH4 ++CO3 2-
Ca2++CO3 2-→CaCO3↓
NH4 ++NO2 -→N2↑+2H2O
The molar concentration of urea liquid and nitrous acid calcium solution is equal in the solution A, and the molar concentration be 10~
100mmol/L.In this way hydrolysis of urea generate ammonium ion and carbanion be able to calcium ion in calcium nitrite and
Nitrite ion reacts completely, can sufficiently solidify to cohesiveless soil, while can also remove ammonium ion.
The OD of the Bacillus pasteurii solution600Greater than 2.Here it can guarantee in bacterium solution containing sufficient Pasteur's gemma bar
Quickly urea can be hydrolyzed for bacterium.
The concentration of each component is respectively as follows: 2~5g/L of saleratus, 40~70mg/L of potassium dihydrogen phosphate, magnesium sulfate in solution C
200~500mg/L, 200~500mg/L of sodium chloride, 8~15mg/L of ferrous sulfate.Here solution C mentions for anaerobic ammonia oxidizing bacteria
For nutrient solution required for growing.
The anaerobic ammonia oxidizing bacteria solution is the solution that anaerobic ammonium oxidation sludge particle is dissolved in water formation, the anaerobism ammonia oxygen
Change mud granule and comes from anaerobic ammonia oxidation process sewage treatment plant or EGSB reactor.Anaerobic ammonium oxidizing bacteria is gathered into particle dirt
Mud form, is converted to biomass, and the biomass that anaerobic ammonium oxidizing bacteria is added is the life of isometric Bacillus pasteurii solution
100~500 times of object amount.
Referring to Fig. 1 and Fig. 2, a kind of reinforcement means of cohesiveless soil, specifically includes the following steps:
(1) prospecting obtains the thickness of depth h and inviscid soil layer of cohesiveless soil layer the to be reinforced upper surface apart from ground surface
Spend s；
(2) solution A, solution B and solution are prepared by the curing agent that a kind of microorganism described in claim 1 reinforces cohesiveless soil
C is spare；
(3) if the ground surface in cohesiveless soil layer to be reinforced bores dry-well vertically downward, all wells are by 1.5~2m of spacing and are in
Matrix form is uniformly distributed, and all wells are divided into slip casting well 1 and pumped well 2, is pumped well around the slip casting well, around pumped well
It is slip casting well；And steel floral tube is inserted into each well, the length l of steel floral tube insertion underground is
(4) Grouting Pipe and drinking-water pipe be installed respectively in the slip casting well and pumped well in step (3), the one of the Grouting Pipe
End is connect with the steel floral tube in slip casting well, and the other end is connect with grouting equipment, to constitute grouting system；The insertion of drinking-water pipe one end
In steel floral tube in pumped well, the other end is connect with pumping equipment, to constitute pumping system；
As shown in Figure 1, Grouting Pipe and the setting of drinking-water pipe interval, arrange upper Grouting Pipe positioned at two and drinking-water pipe are also interval setting
, meanwhile, Grouting Pipe and drinking-water pipe in grouting system and pumping system can be it is multiple, the area disposably reinforced in this way is more
Greatly.
(5) slip casting and reinforcing:
5.1) it first time slip casting: after the grouting equipment in step (4) is connected to solution A and solution C, opens slip casting and sets
Standby, solution A and solution C are that 1:9 is injected into slip casting well, while opening pumping equipment by volume, by the solution I in pumped well
Extraction, and calcium ion concentration in solution I is checked in time, when calcium ion concentration is greater than 60mg/L in solution I, stops pumping and infuse
Slurry, and stand 2~4h；It theoretically, is underground water in solution I at this time, it, may in solution I after solution A and solution C injection
It is the equal of that solution A and solution C and underground water carry out after extracting solution I out containing the component in a small amount of solution A and solution B
Displacement is the mixed solution of solution A and solution C in inviscid soil layer at this time.
After grouting equipment is connected to solution B, grouting equipment is opened, solution B is injected into slip casting well, while opening and drawing water
Solution II in pumped well is extracted out, while detecting OD in solution II by equipment600Value, with underground water OD600Value is blank sample, if surveying
Obtain II OD of solution600Value is blank sample, if measuring solution II subtracts the OD after blank sample600Value is greater than 0.1, stops pumping and infuses
Slurry, and stand 24~48h；At this point, being mainly solution A and solution C and a small amount of Bacillus pasteurii, ammonium root in solution II
Ion and carbanion etc. are added solution B and are convenient for mixing with solution A and solution C, react.
5.2) second of slip casting: repeating step 5.1), and the volume ratio of solution A and solution C is 1:4 during this time slip casting；
5.3) third time slip casting: repeating step 5.1), and the volume ratio of solution A and solution C is 1:1 during this time slip casting；
5.4) the 4th time and with grouting behind shaft or drift lining: repeating step 5.3)；
The calcium carbonate content in cohesiveless soil layer to be reinforced is detected after each slip casting, when detecting cohesiveless soil layer to be reinforced
In calcium carbonate content be more than or equal to setting value when, then complete the reinforcing of the inviscid soil layer in slip casting well corresponding region.
There are toxicity to anaerobic ammonia oxidizing bacteria for high concentration nitrite anions, and toxicity threshold is with the life of anaerobic ammonia oxidizing bacteria
It grows and gradually rises；It being carried out in solidification process to inviscid soil layer, the speed of the higher production calcium carbonate of calcium ion concentration is faster,
Production quantity is higher.For the activity and relatively high calcium carbonate growth rate for guaranteeing anaerobic ammonia oxidizing bacteria in reinforcing process, so
The mode for stepping up calcium ion concentration in solution A and solution C mixed solution optimizes reinforcing process.
Wherein, the vertical error of wellbore construction plane is less than or equal to 80cm in step (3).
Wherein, when injecting solution A and solution C in step (5) into slip casting well, the grouting pressure that grouting equipment is arranged is
100~300KPa；When injecting solution B, the grouting pressure that grouting equipment is arranged is 10~100KPa.In this way using Hyposmolality
Mode injects solution B, so that solution B is mainly migrated in cohesiveless soil layer gap with diffusion, it both will not be by cohesiveless soil
Existing solution in layer gap is gone out, and will not be run from cohesiveless soil layer gap in advance since speed forms preferential stream very much fastly
Out, and then guarantee to make full use of Bacillus pasteurii in solution B.
Wherein, the setting value of calcium carbonate content is 10Kg/m in step (5)3。
Wherein, calcium carbonate content calculates as follows in inviscid soil layer in step (5):
Wherein: the number of n- repetition slip casting；
The molar concentration of urea, mmol/L in A- solution A；
M- calcium carbonate content, Kg/m3。
Embodiment:
One, the preparation before constructing:
1, prospecting obtains depth h=3m and inviscid soil layer of cohesiveless soil layer the to be reinforced upper surface apart from ground surface
Thickness s=5m；
If 2, boring dry-well vertically downward in the ground surface of cohesiveless soil layer to be reinforced, all wells are by spacing 1.5m and are in
Matrix form is uniformly distributed, and all wells are divided into slip casting well and pumped well, is pumped well around the slip casting well, around pumped well
For slip casting well；And the steel floral tube that caliber is 60mm wall thickness 5mm is inserted into each well, the length l of steel floral tube insertion underground
For 7m；Drilling construction plane vertical error is not more than 80cm；
3, Grouting Pipe and drinking-water pipe be installed respectively, in one end of the Grouting Pipe and slip casting well in slip casting well and pumped well
Steel floral tube connection, the other end is connect with grouting equipment, to constitute grouting system；The spray of molten steel in pumped well is inserted into drinking-water pipe one end
In pipe, the other end is connect with pumping equipment, to constitute pumping system.
Two, it is spare that solution A, solution B and solution C are prepared
1, solution A: anaerobic ammonium oxidation granular sludge is derived from anaerobic ammonia oxidation process sewage treatment plant or EGSB reactor, claims
Technical grade calcium nitrite 13.21g (100mmol) and urea 6.01g (100mmol) is taken to be dissolved in 1L water and solution A is made, solution A
It should be stored in the container with blender.
2, solution B: Bacillus pasteurii is seeded in yeast extract medium, and every liter of culture medium contains 15g yeast
Extract, 10g ammonium sulfate are controlled pH 9~10, using constant temperature oscillation case with 120r/min with sodium hydroxide and hydrochloric acid solution
Revolving speed, at 30 DEG C, culture obtains Bacillus pasteurii culture solution in 20-30 hours.In order to guarantee the survival rate of bacterium, preferably connect
It is continuous to be pumped into air.By medium centrifugal, and the aqueous solution for being 5g/L with yeast extract will be centrifuged after bacterium resuspension, obtain bar
Family name's bacillus bacterium solution, the OD of bacterium solution600Greater than 2, solution B should be stored in the container with blender.
3, technical grade saleratus 4.66g, PHOSPHORIC ACID TECH.GRADE potassium dihydrogen 20mg, technical grade sulfuric acid magnesium solution C: are weighed
400mg, industry grade sodium chloride 400mg and technical grade sulfuric acid ferrous iron 10mg are dissolved in 1L water and solution C are made, ready-to-use.
Three, slip casting and reinforcing
1, first time slip casting: after the grouting equipment in step (4) is connected to solution A and solution C, opening grouting equipment,
Solution A and solution C are that 1:9 is injected into slip casting well, while opening pumping equipment by volume, and the solution I in pumped well is taken out
Out, and in time check that calcium ion concentration in solution I is stopped pumping and infused when calcium ion concentration is greater than 60mg/L in solution I
Slurry, and stand 3h；
After grouting equipment is connected to solution B, grouting equipment is opened, solution B is injected into slip casting well, while opening and drawing water
Solution II in pumped well is extracted out, while detecting OD in solution II by equipment600Value, with underground water OD600Value is blank sample, is surveyed
It obtains solution II and subtracts the OD after blank sample600Value is greater than 0.3, stops pumping and slip casting, and stands 48h；
2, second of slip casting: repeating first time slip casting step, and only this time the volume ratio of solution A and solution C is 1:4,
The concentration for detecting the calcium carbonate in inviscid soil layer simultaneously is 6Kg/m3；
3, third time slip casting: repeating first time slip casting step, and only this time the volume ratio of solution A and solution C is 1:1,
The concentration for detecting the calcium carbonate in inviscid soil layer simultaneously is 8Kg/m3；
4, the 4th slip casting: repeating third time slip casting step, and the concentration that detection obtains the calcium carbonate in inviscid soil layer is
13Kg/m3, terminate the reinforcing of reinforcing area.
Finally, it should be noted that the above embodiment of the present invention is only example to illustrate the invention, and it is not
It is the restriction to embodiment of the present invention.For those of ordinary skill in the art, on the basis of the above description also
Other various forms of variations and variation can be made.Here all embodiments can not be exhaustive.It is all to belong to this
The technical solution changes and variations that derived from of invention are still in the scope of protection of the present invention.
Claims (10)
1. the curing agent that a kind of microorganism reinforces cohesiveless soil, which is characterized in that described molten including solution A, solution B and solution C
Liquid A is the mixed solution that anaerobic ammonia oxidizing bacteria solution, urea liquid and nitrous acid calcium solution are formed；The solution B is Pasteur's bud
Spore bacillus solution；The solution C is the mixed solution of saleratus, potassium dihydrogen phosphate, magnesium sulfate, calcium chloride and ferrous sulfate.
2. the curing agent that a kind of microorganism according to claim 1 reinforces cohesiveless soil, which is characterized in that the solution A
The molar concentration of middle nitrous acid calcium solution is equal, and the molar concentration is 10~100mmol/L.
3. the curing agent that a kind of microorganism according to claim 1 reinforces cohesiveless soil, which is characterized in that Pasteur's bud
The OD of spore bacillus solution600Greater than 2.
4. the curing agent that a kind of microorganism according to claim 1 reinforces cohesiveless soil, which is characterized in that each in solution C
The concentration of component is respectively as follows: 2~5g/L of saleratus, 40~70mg/L of potassium dihydrogen phosphate, 200~500mg/L of magnesium sulfate, chlorination
200~500mg/L of sodium, 8~15mg/L of ferrous sulfate.
5. the curing agent that a kind of microorganism according to claim 1 reinforces cohesiveless soil, which is characterized in that the anaerobism ammonia
Oxidation bacteria solution is the solution that anaerobic ammonium oxidation sludge particle is dissolved in water formation.
6. a kind of reinforcement means of cohesiveless soil, which is characterized in that specifically includes the following steps:
(1) prospecting obtains depth h and inviscid the thickness of the layer s of cohesiveless soil layer the to be reinforced upper surface apart from ground surface；
(2) curing agent preparation solution A, solution B and the solution C for reinforcing cohesiveless soil by a kind of microorganism described in claim 1 are standby
With；
(3) if the ground surface in cohesiveless soil layer to be reinforced bores dry-well vertically downward, all wells are by 1.5~2m of spacing and are in matrix
Formula is uniformly distributed, and all wells are divided into slip casting well and pumped well, is pumped well around the slip casting well, is note around pumped well
Starch well；And steel floral tube is inserted into each well, the length l of steel floral tube insertion underground is
(4) Grouting Pipe and drinking-water pipe be installed respectively in the slip casting well and pumped well in step (3), one end of the Grouting Pipe with
Steel floral tube connection in slip casting well, the other end are connect with grouting equipment；Drinking-water pipe one end is inserted into the steel floral tube in pumped well, separately
One end is connect with pumping equipment；
(5) slip casting and reinforcing:
5.1) first time slip casting: after the grouting equipment in step (4) is connected to solution A and solution C, opening grouting equipment, molten
Liquid A and solution C are that 1:9 is injected into slip casting well, while opening pumping equipment by volume, and the solution I in pumped well is extracted out,
And calcium ion concentration in solution I is checked in time, when calcium ion concentration is greater than 60mg/L in solution I, stop pumping and slip casting, and
Stand 3h；
After grouting equipment is connected to solution B, grouting equipment is opened, solution B is injected into slip casting well, while opening to draw water and set
It is standby, the solution II in pumped well is extracted out, while detecting OD in solution II600Value, with underground water OD600Value is blank sample, if surveying
It obtains solution II and subtracts the OD after blank sample600Value is greater than 0.1, stops pumping and slip casting, and stands 24~48h；
5.2) second of slip casting: repeating step 5.1), and the volume ratio of solution A and solution C is 1:4 during this time slip casting；
5.3) third time slip casting: repeating step 5.1), and the volume ratio of solution A and solution C is 1:1 during this time slip casting；
5.4) the 4th time and with grouting behind shaft or drift lining: repeating step 5.3)；
The calcium carbonate content in cohesiveless soil layer to be reinforced is detected after each slip casting, when detecting in cohesiveless soil layer to be reinforced
When calcium carbonate content is more than or equal to setting value, then the reinforcing of the inviscid soil layer in slip casting well corresponding region is completed.
7. a kind of reinforcement means of cohesiveless soil according to claim 6, which is characterized in that wellbore construction in step (3)
The vertical error of plane is less than or equal to 80cm.
8. a kind of reinforcement means of cohesiveless soil according to claim 6, which is characterized in that toward slip casting well in step (5)
When middle injection solution A and solution C, the grouting pressure that grouting equipment is arranged is 100~300KPa；When injecting solution B, slip casting is set
The grouting pressure of equipment is 10~100KPa.
9. a kind of reinforcement means of cohesiveless soil according to claim 6, which is characterized in that calcium carbonate contains in step (5)
The setting value of amount is 10Kg/m3。
10. a kind of reinforcement means of cohesiveless soil according to claim 6, which is characterized in that cohesiveless soil in step (5)
Calcium carbonate content calculates as follows in layer:
Wherein: the number of n- repetition slip casting；
The molar concentration of urea, mmol/L in A- solution A；
M- calcium carbonate content, Kg/m3。
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| CN111377627A (en) * | 2020-02-18 | 2020-07-07 | 温州大学 | Method for reinforcing residual soil by novel microbial inorganic cementing material and spraying equipment thereof |
| CN111395310A (en) * | 2020-02-18 | 2020-07-10 | 温州大学 | Method for reinforcing residual soil by carbonizing and mineralizing photosynthetic microorganisms and construction equipment thereof |
| CN113185981A (en) * | 2021-04-12 | 2021-07-30 | 三峡大学 | Urease reinforcing liquid for slope protection and preparation and construction method thereof |
| CN113250184A (en) * | 2021-03-31 | 2021-08-13 | 南京大学 | Combined repairing method for multi-scale fracture of rock mass based on microbial mineralization |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| JP2016222776A (en) * | 2015-05-28 | 2016-12-28 | 株式会社竹中工務店 | Heavy metal insolubilized composition and method for repairing heavy metal contaminated soil |
| CN107555616A (en) * | 2017-10-31 | 2018-01-09 | 苏州科技大学 | A kind of method that ammonia nitrogen and nitrate nitrogen synchronously remove in water body |
| CN108408891A (en) * | 2018-05-16 | 2018-08-17 | 郑州大学 | The device and method of ammonia nitrogen in a kind of sludge bed reactor, the enrichment method of anaerobic ammonia oxidizing bacteria, removal waste water |
-
2019
- 2019-06-25 CN CN201910555665.1A patent/CN110241809B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016222776A (en) * | 2015-05-28 | 2016-12-28 | 株式会社竹中工務店 | Heavy metal insolubilized composition and method for repairing heavy metal contaminated soil |
| 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 |
| 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 |
| CN107555616A (en) * | 2017-10-31 | 2018-01-09 | 苏州科技大学 | A kind of method that ammonia nitrogen and nitrate nitrogen synchronously remove in water body |
| CN108408891A (en) * | 2018-05-16 | 2018-08-17 | 郑州大学 | The device and method of ammonia nitrogen in a kind of sludge bed reactor, the enrichment method of anaerobic ammonia oxidizing bacteria, removal waste water |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111377627A (en) * | 2020-02-18 | 2020-07-07 | 温州大学 | Method for reinforcing residual soil by novel microbial inorganic cementing material and spraying equipment thereof |
| CN111395310A (en) * | 2020-02-18 | 2020-07-10 | 温州大学 | Method for reinforcing residual soil by carbonizing and mineralizing photosynthetic microorganisms and construction equipment thereof |
| CN113250184A (en) * | 2021-03-31 | 2021-08-13 | 南京大学 | Combined repairing method for multi-scale fracture of rock mass based on microbial mineralization |
| CN113250184B (en) * | 2021-03-31 | 2022-02-01 | 南京大学 | Combined repairing method for multi-scale fracture of rock mass based on microbial mineralization |
| CN113185981A (en) * | 2021-04-12 | 2021-07-30 | 三峡大学 | Urease reinforcing liquid for slope protection and preparation and construction method thereof |
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