CN110284491B - Magnetized solution microorganism soil solidifying device and method - Google Patents
Magnetized solution microorganism soil solidifying device and method Download PDFInfo
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- CN110284491B CN110284491B CN201910705035.8A CN201910705035A CN110284491B CN 110284491 B CN110284491 B CN 110284491B CN 201910705035 A CN201910705035 A CN 201910705035A CN 110284491 B CN110284491 B CN 110284491B
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- 239000002689 soil Substances 0.000 title claims abstract description 78
- 244000005700 microbiome Species 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 181
- 230000001580 bacterial effect Effects 0.000 claims abstract description 81
- 239000002002 slurry Substances 0.000 claims abstract description 64
- 230000000813 microbial effect Effects 0.000 claims abstract description 40
- 238000003756 stirring Methods 0.000 claims abstract description 32
- 230000005415 magnetization Effects 0.000 claims abstract description 28
- 238000005507 spraying Methods 0.000 claims abstract description 13
- 239000000243 solution Substances 0.000 claims description 25
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 12
- 239000004202 carbamide Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 159000000007 calcium salts Chemical class 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 6
- 108010046334 Urease Proteins 0.000 claims description 5
- 239000012266 salt solution Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 241000894006 Bacteria Species 0.000 claims description 3
- 235000015097 nutrients Nutrition 0.000 claims description 2
- 230000001976 improved effect Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 241000233866 Fungi Species 0.000 abstract 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 42
- 229910000019 calcium carbonate Inorganic materials 0.000 description 21
- 239000013078 crystal Substances 0.000 description 12
- 239000002245 particle Substances 0.000 description 11
- 230000003014 reinforcing effect Effects 0.000 description 9
- 238000002425 crystallisation Methods 0.000 description 6
- 230000008025 crystallization Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000000126 substance Substances 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
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Piles And Underground Anchors (AREA)
Abstract
A magnetized solution microorganism soil solidifying device and a magnetized solution microorganism soil solidifying method are provided, wherein the device comprises a cementing liquid container, a fungus liquid container, a cementing liquid input pipe, a cementing liquid control valve, a fungus liquid control valve, a magnetized processor, a magnetized microorganism slurry output pipe, a slurry pump, a drill rod, a blade and a slurry spraying port. The method for using the magnetized solution microorganism soil solidifying device mainly comprises the following steps: the cementing liquid and the bacterial liquid respectively enter a magnetization processor from a cementing liquid input pipe and a bacterial liquid input pipe to prepare magnetized microbial slurry, the magnetized microbial slurry is conveyed to a guniting port, and a drill rod drives a blade to stir a foundation to be reinforced and lift a drill to prepare the microbial stirring pile. The device is used for magnetizing bacterial liquid and cementing liquid under the action of a magnetic field, then injecting the bacterial liquid and the cementing liquid into a foundation to be reinforced and stirring, so that a uniform and high-strength microorganism stirring pile can be manufactured, the utilization rate of materials is improved, and the construction period is shortened.
Description
Technical Field
The invention relates to a device and a soil-fixing method for improving the working performance of microorganism soil-fixing slurry by magnetization treatment, belonging to the technical field of foundation treatment.
Background
Compared with the traditional chemical soil fixing technology, the microbial soil fixing technology is a more environment-friendly soil fixing method. The microbial bacterial liquid and the cementing liquid are mixed and conveyed into loose soil, and after the calcium carbonate is induced by microorganisms to precipitate and crystallize cemented soil particles, a blocky, wall-shaped or single-pile reinforcing body is formed in the foundation, so that the bearing capacity of the foundation can be effectively improved, and the foundation settlement can be reduced. In the process of solidifying the soil body by microorganisms, the activity of the microorganisms and nucleation sites are important factors influencing the process of inducing calcium carbonate crystallization by the microorganisms, the cementing rate and strength of the solidified soil body are directly influenced, and the realization of the controllability of the microorganism reaction process is a key link of applying the microorganism soil solidification technology.
Technical proposal of the prior art
The microorganism grouting is used for reinforcing the foundation, a grouting pipe is inserted into the foundation to be reinforced, bacterial liquid and cementing liquid containing calcium salt and urea are injected into soil through the grouting pipe together or sequentially, and microorganisms are utilized to induce calcium carbonate precipitation reaction, so that microorganisms adsorbed on soil particles are continuously mineralized to generate calcium carbonate crystals, the soil particles are cemented, the soil strength is improved, and the foundation is reinforced.
Shortcomings of the prior art
When microorganism grouting is used for reinforcing a foundation, bacteria liquid and cementing liquid diffuse and permeate to soil through a grouting pipe, calcium carbonate is fast in crystallization speed near a grouting pipe orifice and easy to form blockage, microorganisms are difficult to convey to a region far away from the grouting pipe, the soil at the far end is poor in reinforcing effect, the soil reinforcing region is small, and the strength and uniformity of the reinforcing body are low.
Technical proposal of the second prior art
The microbial stirring pile is used for reinforcing the foundation, bacterial liquid and cementing liquid containing calcium salt and urea are stirred and injected into the foundation to be reinforced together or sequentially, and the soil body, the bacterial liquid and the cementing liquid are mixed by rotating stirring blades of a stirring pile machine to form a reinforcing body.
Disadvantages of the second prior art
The microbial mixing pile can be made into a cylindrical pile body with certain strength and uniform texture, but because the speed of the microbial induced calcium carbonate reaction is faster and difficult to control, when the mixing pile machine is constructed, the mixing blades continuously mix and cut the soil body, and the calcium carbonate cement among the soil particles is mixed and destroyed while forming inter-granular connection. When stirring is stopped, most of calcium carbonate crystals can only play a role in filling soil voids, residual effective inter-particle cementing is less, and finally pile forming strength is not high or reinforcement is not effective.
Disclosure of Invention
The prior art can not well solve the problem of low strength of the microbial mixing pile, the microbial soil fixing technology is used for conveying bacterial liquid and cementing liquid into soil, the alkaline environment formed by urea hydrolysis reaction is favorable for adsorbing calcium ions in calcium salt on the surface of soil particles, calcium ions and carbonate ions generated by urea hydrolysis reaction are combined into calcium carbonate crystals which are continuously increased, and the surfaces of the soil particles are wrapped and bridged, so that cementing and filling effects are achieved. However, the reaction rate of the calcium carbonate crystallization induced by the microorganism is very fast and difficult to control, the generated cementing body can be damaged in the process of stirring and piling, and finally the calcium carbonate serving as the cementing body only plays a role of filling the pores of the soil body, so that the strength of the strengthening body cannot be expected.
The principle of the invention is as follows: after bacterial liquid and cementing liquid containing calcium salt and urea enter a magnetization processor from a pipeline, magnetic force lines are repeatedly cut in the vertical direction for multiple times, the activity of microorganism individuals is inhibited under the action of Lorentz force, and meanwhile, ca 2+ and Ca 2+ in the solution are restrained by a magnetic fieldThe Brownian movement speed, the ion concentration near the magnetic line of force is higher, and the movement direction of the anions and the cations is opposite, ca 2+ and Ca 2+ are addedThe probability of meeting. Ca 2+ In the solution, in the form of hydrated ions, the mutual collision of the ions changes the hydration state of the ions, and a large number of single water molecules are generated at the same time of generating calcium carbonate crystals, the more the water molecule activity is increased, the smaller the solubility is, and the smaller the supersaturation degree of calcium carbonate is, thereby inhibiting the nucleation rate of calcium carbonate crystals. In addition, the magnetic field has an orientation effect on water molecules, and calcium carbonate crystals are bound between the water molecules, so that small crystals cannot move freely, and are difficult to meet and combine into large crystals. The small crystal calcium carbonate is conveyed into soil along with magnetized microbial slurry, the small crystal calcium carbonate is stirred by a stirring blade and is uniformly mixed with foundation soil to be reinforced, after the magnetized microbial slurry is gradually separated from magnetization influence, the microbial activity is gradually recovered, the individual microorganisms and the small crystal calcium carbonate are taken as crystallization nuclei, and calcium carbonate crystals form packages on the surfaces of soil particles and form bridges among the soil particles, so that the uniform and high-strength reinforced soil is gradually formed, and the purpose of reinforcing the foundation is achieved.
The invention aims to solve the problem of low strength of the microbial mixing pile, and the cementing liquid and the bacterial liquid are simultaneously conveyed to soil after passing through the magnetization processor, so that the speed of cementing connection among soil particles formed by calcium carbonate crystallization induced by microorganisms can be more effectively controlled, the utilization efficiency of materials is improved, and the soil fixing effect is improved.
The technical scheme of the invention is as follows:
The device is characterized by comprising a cementing liquid container 1, a bacterial liquid container 2, a cementing liquid input pipe 3, a bacterial liquid input pipe 4, a cementing liquid control valve 5, a bacterial liquid control valve 6, a magnetization processor 7, a magnetized microbial slurry output pipe 8, a slurry pump 9, a drill rod 10, a microbial stirring pile body 12, blades 13 and a slurry spraying port 14.
The microbial soil solidifying device for magnetized solution is characterized in that a magnetization processor 7 consists of a shell 15 and a magnetic core assembly 16, the magnetic core assembly 16 consists of a plurality of groups of magnetic blocks NS which are alternately arranged, the magnetic blocks are permanent magnets or electromagnetic, the magnetic field intensity is 6000-10000 gauss, the magnetization processor 7 is connected with a cementing liquid input pipe 3, a bacterial liquid input pipe 4 and a magnetized microbial slurry output pipe 8, the input cementing liquid and bacterial liquid are respectively subjected to the magnetic field action in the magnetization processor 7 and then are mixed, and the mixed liquid is output after the magnetic field action.
The soil fixing method using the magnetized solution microorganism soil fixing device is characterized by comprising the following steps:
a. preparing cementing liquid formed by mixing calcium salt and urea, placing the cementing liquid in a cementing liquid container 1, and placing prepared bacterial liquid in a bacterial liquid container 2;
b. the drill rod 10 drives the blades 13 to stir the foundation 11 to be reinforced in a rotating way until the pile bottom elevation is reached;
c. the slurry pump 9 is started, the dosage of cementing liquid and bacterial liquid is controlled through the cementing liquid control valve 5 and the bacterial liquid control valve 6, the cementing liquid and the bacterial liquid respectively enter the magnetization processor 7 from the cementing liquid input pipe 3 and the bacterial liquid input pipe 4 to prepare magnetized microbial slurry, and the magnetized microbial slurry is conveyed to the slurry spraying port 14 through the magnetized microbial slurry output pipe 8;
d. The guniting port 14 sprays magnetized microorganism slurry, the drill rod 10 drives the blade 13 to stir the foundation 11 to be reinforced in a rotating way and lift the drill, stopping after reaching the designed elevation of the pile top, and closing the slurry pump 9;
e. repeating the b-d operation for 2-4 times to prepare the microbial stirring pile body 12.
The soil solidifying method using the magnetized solution microorganism soil solidifying device is characterized in that the bacterial liquid in the step a consists of urease bacteria and nutrient solution, the bacterial liquid concentration OD 600 = 1.0-2.0, and the cementing liquid is formed by mixing 1.0-1.5 mol/L calcium salt solution and urea with equal molar concentration.
The soil solidifying method using the magnetized solution microorganism soil solidifying device is characterized in that the dosage volume ratio of the cementing liquid to the bacterial liquid in the step c is 2:1-1:2, and the total dosage volume of the cementing liquid and the bacterial liquid is 0.6-1.0 times of the pore volume of the soil body in the foundation 11 to be solidified.
The invention has the beneficial effects that: (1) The slurry can inhibit crystallization of large-particle calcium carbonate before being mixed with the soil body to be reinforced, slow down the cementing rate, avoid the connection damage of the cementing body in the process of stirring and soil fixation, and improve the material utilization rate and the strength of the reinforced soil body; (2) The process of injecting the slurry into the soil body in stages is simplified, and the construction period is shortened; (3) The scaling and blocking of the drill rod and the guniting port are avoided, and the maintenance cost of construction machinery is reduced.
Drawings
FIG. 1 is a schematic diagram of a magnetized solution microorganism soil solidifying device;
FIG. 2 is a schematic cross-sectional view of a magnetization processor structure
Reference numerals: the device comprises a 1-cementing liquid container, a 2-bacteria liquid container, a 3-cementing liquid input pipe, a 4-bacteria liquid input pipe, a 5-cementing liquid control valve, a 6-bacteria liquid control valve, a 7-magnetization processor, an 8-magnetization microorganism slurry output pipe, a 9-slurry pump, a 10-drill pipe, a 11-foundation to be reinforced, a 12-microorganism stirring pile body, 13-blades, 14-slurry spraying ports, a 15-shell and a 16-magnetic core component.
Detailed Description
Example 1
In the embodiment, a magnetized solution microorganism soil solidifying device and a soil solidifying method are used for strengthening a silt foundation, the length of a designed pile is 8.0m, the diameter of the pile is 0.6m, and the magnetized solution microorganism soil solidifying device is composed of a cementing liquid container 1, a bacterial liquid container 2, a cementing liquid input pipe 3, a bacterial liquid input pipe 4, a cementing liquid control valve 5, a bacterial liquid control valve 6, a magnetization processor 7, a magnetized microorganism slurry output pipe 8, a slurry pump 9, a drill rod 10, a microorganism stirring pile body 12, blades 13 and a slurry spraying port 14.
The microbial soil solidifying device for the magnetized solution is characterized in that a magnetization processor 7 consists of a shell 15 and a magnetic core assembly 16, the magnetic core assembly 16 consists of a plurality of groups of magnetic blocks NS which are alternately arranged, the magnetic blocks are permanent magnets, the magnetic field intensity is 6000 gauss, the magnetization processor 7 is connected with a cementing liquid input pipe 3, a bacterial liquid input pipe 4 and a magnetized microbial slurry output pipe 8, the input cementing liquid and bacterial liquid are respectively and independently subjected to the magnetic field in the magnetization processor 7 and then are mixed, and the mixed liquid is output after the magnetic field is acted.
The soil fixing method using the magnetized solution microorganism soil fixing device comprises the following steps:
a. Mixing 1.5mol/L calcium salt solution with urea with equal molar concentration to prepare cementing liquid, placing the cementing liquid in a cementing liquid container 1, and placing urease bacterial liquid with the concentration of OD 600 = 2.0 in a bacterial liquid container 2;
b. the drill rod 10 drives the blades 13 to stir the foundation 11 to be reinforced in a rotating way until the pile bottom elevation is reached;
c. The slurry pump 9 is started, the dosage of cementing liquid and bacterial liquid is controlled through the cementing liquid control valve 5 and the bacterial liquid control valve 6, the cementing liquid and the bacterial liquid enter the magnetization processor 7 from the cementing liquid input pipe 3 and the bacterial liquid input pipe 4 respectively, magnetized microbial slurry is prepared and is conveyed to the slurry spraying port 14 through the magnetized microbial slurry output pipe 8, wherein the dosage volume ratio of the cementing liquid and the bacterial liquid is 2:1, and the total dosage volume of the cementing liquid and the bacterial liquid is 1.0 times of the pore volume of soil in the foundation 11 to be reinforced;
d. The guniting port 14 sprays magnetized microorganism slurry, the drill rod 10 drives the blade 13 to stir the foundation 11 to be reinforced in a rotating way and lift the drill, stopping after reaching the designed elevation of the pile top, and closing the slurry pump 9;
e. Repeating the operations b-d for 2 times to prepare the microbial stirring pile body 12.
Example 2
In the embodiment, a magnetized solution microorganism soil solidifying device and a soil solidifying method are used for strengthening a powdery clay foundation, the length of a designed pile is 6.0m, the diameter of the pile is 0.5m, and the magnetized solution microorganism soil solidifying device is composed of a cementing liquid container 1, a bacterial liquid container 2, a bacterial liquid input pipe 3, a bacterial liquid input pipe 4, a cementing liquid control valve 5, a bacterial liquid control valve 6, a magnetization processor 7, a magnetized microorganism slurry output pipe 8, a slurry pump 9, a drill pipe 10, a microorganism stirring pile body 12, blades 13 and a slurry spraying port 14.
The microbial soil solidifying device for the magnetized solution is characterized in that a magnetization processor 7 consists of a shell 15 and a magnetic core assembly 16, the magnetic core assembly 16 consists of a plurality of groups of magnetic blocks NS which are alternately arranged, the magnetic blocks are electromagnetic, the magnetic field strength is 8000 gauss, the magnetization processor 7 is connected with a cementing liquid input pipe 3, a bacterial liquid input pipe 4 and a magnetized microbial slurry output pipe 8, the input cementing liquid and bacterial liquid are respectively and independently subjected to the magnetic field in the magnetization processor 7 and then are mixed, and the mixed liquid is output after the magnetic field is acted.
The soil fixing method using the magnetized solution microorganism soil fixing device comprises the following steps:
a. Mixing 1.25mol/L calcium salt solution with urea with equal molar concentration to prepare cementing liquid, placing the cementing liquid in a cementing liquid container 1, and placing urease bacterial liquid with the concentration of OD 600 = 1.5 in a bacterial liquid container 2;
b. the drill rod 10 drives the blades 13 to stir the foundation 11 to be reinforced in a rotating way until the pile bottom elevation is reached;
c. The slurry pump 9 is started, the dosage of cementing liquid and bacterial liquid is controlled through the cementing liquid control valve 5 and the bacterial liquid control valve 6, the cementing liquid and the bacterial liquid enter the magnetization processor 7 from the cementing liquid input pipe 3 and the bacterial liquid input pipe 4 respectively, magnetized microbial slurry is prepared and is conveyed to the slurry spraying port 14 through the magnetized microbial slurry output pipe 8, wherein the dosage volume ratio of the cementing liquid and the bacterial liquid is 1:1, and the total dosage volume of the cementing liquid and the bacterial liquid is 0.8 times of the pore volume of soil in the foundation 11 to be reinforced;
d. The guniting port 14 sprays magnetized microorganism slurry, the drill rod 10 drives the blade 13 to stir the foundation 11 to be reinforced in a rotating way and lift the drill, stopping after reaching the designed elevation of the pile top, and closing the slurry pump 9;
e. repeating the operations b-d for 3 times to prepare the microbial stirring pile body 12.
Example 3
In the embodiment, a magnetized solution microorganism soil solidifying device and a soil solidifying method are used for strengthening a clay foundation, the length of a designed pile is 8.0m, the diameter of the pile is 0.6m, and the magnetized solution microorganism soil solidifying device is composed of a cementing liquid container 1, a bacterial liquid container 2, a cementing liquid input pipe 3, a bacterial liquid input pipe 4, a cementing liquid control valve 5, a bacterial liquid control valve 6, a magnetization processor 7, a magnetized microorganism slurry output pipe 8, a slurry pump 9, a drill rod 10, a microorganism stirring pile body 12, blades 13 and a slurry spraying port 14.
The microbial soil solidifying device for the magnetized solution is characterized in that a magnetization processor 7 consists of a shell 15 and a magnetic core assembly 16, the magnetic core assembly 16 consists of a plurality of groups of magnetic blocks NS which are alternately arranged, the magnetic blocks are electromagnetic, the magnetic field strength is 10000 gauss, the magnetization processor 7 is connected with a cementing liquid input pipe 3, a bacterial liquid input pipe 4 and a magnetized microbial slurry output pipe 8, the input cementing liquid and bacterial liquid are respectively and independently subjected to the magnetic field in the magnetization processor 7 and then are mixed, and the mixed liquid is output after the magnetic field is acted.
The soil fixing method using the magnetized solution microorganism soil fixing device comprises the following steps:
a. Mixing 1.0mol/L calcium salt solution with urea with equal molar concentration to prepare cementing liquid, placing the cementing liquid in a cementing liquid container 1, and placing urease bacterial liquid with the concentration of OD 600 = 1.0 in a bacterial liquid container 2;
b. the drill rod 10 drives the blades 13 to stir the foundation 11 to be reinforced in a rotating way until the pile bottom elevation is reached;
c. The slurry pump 9 is started, the dosage of cementing liquid and bacterial liquid is controlled through the cementing liquid control valve 5 and the bacterial liquid control valve 6, the cementing liquid and the bacterial liquid enter the magnetization processor 7 from the cementing liquid input pipe 3 and the bacterial liquid input pipe 4 respectively, magnetized microbial slurry is prepared and is conveyed to the slurry spraying port 14 through the magnetized microbial slurry output pipe 8, wherein the dosage volume ratio of the cementing liquid and the bacterial liquid is 1:2, and the total dosage volume of the cementing liquid and the bacterial liquid is 0.6 times of the pore volume of soil in the foundation 11 to be reinforced;
d. The guniting port 14 sprays magnetized microorganism slurry, the drill rod 10 drives the blade 13 to stir the foundation 11 to be reinforced in a rotating way and lift the drill, stopping after reaching the designed elevation of the pile top, and closing the slurry pump 9;
e. repeating the operations b-d for 4 times to prepare the microbial stirring pile body 12.
Claims (3)
1. The soil solidifying method using a magnetized solution microorganism soil solidifying device comprises a cementing liquid container (1), a bacterial liquid container (2), a cementing liquid input pipe (3), a bacterial liquid input pipe (4), a cementing liquid control valve (5), a bacterial liquid control valve (6), a magnetization processor (7), a magnetized microorganism slurry output pipe (8), a slurry pump (9), a drill pipe (10), a microorganism stirring pile body (12), blades (13) and a slurry spraying port (14); the magnetizing processor (7) consists of a shell (15) and a magnetic core assembly (16), wherein the magnetic core assembly (16) consists of a plurality of groups of magnetic blocks NS, the magnetic blocks are alternately arranged, the magnetic field intensity is 6000-10000 Gauss, the magnetizing processor (7) is connected with a cementing liquid input pipe (3), a bacterial liquid input pipe (4) and a magnetized microorganism slurry output pipe (8), the input cementing liquid and bacterial liquid are respectively and independently subjected to the magnetic field in the magnetizing processor (7) and then are mixed, and the mixed liquid is output after the magnetic field is acted, and the method is characterized by comprising the following steps:
a. preparing cementing liquid formed by mixing calcium salt and urea, placing the cementing liquid in a cementing liquid container (1), and placing prepared bacterial liquid in a bacterial liquid container (2);
b. the drill rod (10) drives the blades (13) to stir the foundation (11) to be reinforced in a rotating way until the pile bottom elevation is reached;
c. Starting a slurry pump (9), controlling the dosage of cementing liquid and bacterial liquid through a cementing liquid control valve (5) and a bacterial liquid control valve (6), enabling the cementing liquid and the bacterial liquid to enter a magnetization processor (7) from a cementing liquid input pipe (3) and a bacterial liquid input pipe (4) respectively, and preparing magnetized microbial slurry which is conveyed to a slurry spraying port (14) through a magnetized microbial slurry output pipe (8);
d. The spraying opening (14) sprays magnetized microorganism slurry, the drill rod (10) drives the blade (13) to stir the foundation (11) to be reinforced in a rotating way and lift the drill, and the slurry pump (9) is closed after the designed elevation of the pile top is reached;
e. repeating the operation b-d for 2-4 times to prepare the microbial stirring pile body (12).
2. The soil solidifying method using the magnetized solution microorganism soil solidifying device according to claim 1, wherein the bacterial liquid in the step a is composed of urease bacteria and nutrient solution, the bacterial liquid concentration OD 600 = 1.0-2.0, and the cementing liquid is formed by mixing 1.0-1.5 mol/L calcium salt solution and urea with equal molar concentration.
3. The soil solidifying method using the magnetized solution microorganism soil solidifying device according to claim 1, wherein the dosage volume ratio of the cementing liquid and the bacterial liquid in the step c is 2:1-1:2, and the total dosage volume of the cementing liquid and the bacterial liquid is 0.6-1.0 times of the pore volume of the soil body in the foundation (11) to be solidified.
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| CN111396052B (en) * | 2020-02-18 | 2023-03-07 | 温州大学 | Method for mineralizing and reinforcing coal pillar by urease microorganisms |
| CN111139084B (en) * | 2020-03-03 | 2021-03-05 | 江苏科技大学 | Microbial curing agent for soft foundation reinforcement and preparation method thereof |
| CN112147302B (en) * | 2020-09-04 | 2022-08-05 | 三峡大学 | Centrifugal type graded presplitting and microorganism grouting solidification maintenance test device and method |
| CN112813953B (en) * | 2020-12-29 | 2022-04-15 | 南京工业大学 | Device for reinforcing foundation by microorganism ultrasonic grouting and construction method thereof |
| CN113092719A (en) * | 2021-04-01 | 2021-07-09 | 武汉科技大学 | A test device for microorganism solidification soil body |
| CN113756355B (en) * | 2021-09-07 | 2023-10-13 | 安方高科电磁安全技术(北京)有限公司 | Weak magnetic foundation replacement method and weak magnetic laboratory |
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| CN107100162A (en) * | 2017-05-19 | 2017-08-29 | 南京林业大学 | A kind of solid indigenous method of microorganism gas-liquid cycle slip casting |
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| CN211368668U (en) * | 2019-07-31 | 2020-08-28 | 南京林业大学 | Magnetized solution microorganism soil stabilization device |
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