CN108894208B - Microbial treatment method for low-decomposition-degree peat soil foundation - Google Patents

Microbial treatment method for low-decomposition-degree peat soil foundation Download PDF

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CN108894208B
CN108894208B CN201810454896.9A CN201810454896A CN108894208B CN 108894208 B CN108894208 B CN 108894208B CN 201810454896 A CN201810454896 A CN 201810454896A CN 108894208 B CN108894208 B CN 108894208B
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pipe
nutrient solution
growth promoting
pumping
soil
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CN108894208A (en
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桂跃
方超
吴承坤
刘锐
刘颖伸
杨松
徐其福
段亮亮
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Kunming University of Science and Technology
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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
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N1/00—Microorganisms, e.g. protozoa; Compositions thereof; Processes of propagating, maintaining or preserving microorganisms or compositions thereof; Processes of preparing or isolating a composition containing a microorganism; Culture media therefor

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Abstract

The invention discloses a microbial treatment method for a low-decomposition-degree peat soil foundation, which comprises the following steps: preparing a microbial growth promoting nutrient solution; vertically arranging a feeding pipe and a pumping pipe in the target foundation soil; thirdly, pouring microorganism growth promoting nutrient solution into the feeding pipe, pumping out the mixture of the microorganism growth promoting nutrient solution and other filtrate from the pumping pipe and then pouring the mixture into the feeding pipe, thereby realizing the circulation of the microorganism growth promoting nutrient solution in the soil; and fourthly, after the target foundation is treated, directly pumping out the mixture of the microorganism growth promoting nutrient solution and other filtrate by using a material pumping pipe, treating and discharging. The invention combines the biological science and the geotechnical engineering, and utilizes the microorganisms to reduce the content of organic matters in the soil, thereby improving the engineering property of the foundation soil; the construction is simple and convenient, no noise and vibration exist, the technical treatment cost is low, and a new means is provided for the treatment of the low-decomposition-degree peat soil foundation.

Description

Microbial treatment method for low-decomposition-degree peat soil foundation
Technical Field
The invention relates to a microbial treatment method for a low-decomposition-degree peat soil foundation, and belongs to the technical field of biological geotechnical engineering foundation treatment.
Background
The peat soil is distributed in a large quantity all over the world, and the total area is up to 415.3 km2The above. Wherein, a great part of peat soil belongs to low-decomposition-degree peat soil, and is characterized in that the soil contains a large amount of undecomposed and semi-decomposed residual fibersw f Up to more than 10-30%. The residual fibers are mainly from the residues of the decomposed plant roots, branches and leaves. The low-decomposition-degree peat soil has the extremely poor engineering geological characteristics of large porosity ratio, high natural water content, low bearing capacity, obvious compressibility and the like, and is poor foundation soil in geotechnical engineering.
The foundation treatment method commonly used in engineering is many, such as a replacement filling method, a sand-gravel pile method, a drainage consolidation method, a dynamic compaction method, a cement-soil stirring method, a cement-flyash-gravel pile (CFG pile) method and the like. The methods are limited when applied to low-decomposition-degree peat soil foundations, for example, the replacement filling method is suitable for the situation that the problem soil layer is thin, and when the problem soil layer is thick, the replacement filling technology is difficult to realize due to high cost and high construction difficulty; the low-decomposition-degree peat soil is extremely low in strength and cannot provide strong enough constraint for scattered pile bodies, so that the gravel pile method is poor in effect; the dynamic compaction method cannot be adopted in urban areas due to vibration in the construction process; the cement is difficult to hydrate and solidify in the peat soil to form a pile body, so the cement-soil stirring method has poor effect; therefore, a brand new foundation treatment method aiming at the self characteristics of the low-decomposition-degree peat soil is urgently needed to be developed, and the problem of long-term foundation settlement is solved.
Disclosure of Invention
The invention provides a microbial treatment method for a low-decomposition-degree peat soil foundation, which is used for decomposing residual fibers in a low-decomposition-degree peat soil layer by using microorganisms by increasing the number and activity of the microorganisms in the soil, so that the engineering property of the soil is improved, and the bearing performance of foundation soil is improved.
The technical scheme of the invention is as follows: a microbial treatment method for a low-decomposition-degree peat soil foundation comprises the following steps: preparing a microbial growth promoting nutrient solution 3; vertically arranging a feeding pipe 1 and a pumping pipe 2 in the target foundation soil; thirdly, microorganism growth promoting nutrient solution 3 is poured into the feeding pipe 1, the mixture of the microorganism growth promoting nutrient solution 3 and other filter liquor is pumped out from the pumping pipe 2 and then is poured into the feeding pipe 1 again, and the circulation of the microorganism growth promoting nutrient solution in the soil is realized; and fourthly, after the target foundation is treated, directly pumping out the mixture of the microorganism growth promoting nutrient solution 3 and other filtrate by using the pumping pipe 2, treating and discharging.
The preparation of the microorganism growth promoting nutrient solution 3 comprises the following steps: mixing starch, glucose, urea and potassium dihydrogen phosphate according to a mass ratio of 100-200: 10-20: 5:1 to obtain a mixed substance; and adding the mixed substances into deionized water or water according to the mass ratio of 1:100, and fully and uniformly stirring to obtain the microbial growth promoting nutrient solution 3.
The feeding pipe 1 and the pumping pipe 2 are formed by inserting a pipe after being formed into holes by adopting an auger drilling process; the material pumping pipe 2 is deeper than the material feeding pipe 1 by 1-2 m.
The pipe is a PVC pipe.
The periphery of the inlet pipe 1 and the pumping pipe 2 is provided with holes, the tops of the inlet pipe 1 and the pumping pipe 2 are open, the bottom of the inlet pipe 1 is open, and the bottom of the pumping pipe 2 is closed.
The diameter of the feeding pipes 1 and the diameter of the pumping pipes 2 are 120-160 mm, the distance between the feeding pipes 1 is 1-2 m in the plane position, and the pumping pipes 2 are arranged at the geometric centers of the plurality of feeding pipes 1 which are arranged in a regular triangle, square or quincunx shape.
One end of the feeding pipe 1 and one end of the pumping pipe 2 extend out of the ground, and the pipe top extending out of the ground is paved by adopting a shielding object.
The water pumping pipe 7 extending into the bottom of the pumping pipe 2 is connected with a water pumping pump 6 to pump out the mixture of the microorganism growth promoting nutrient solution 3 and water in the pumping pipe 2.
The invention has the beneficial effects that:
1) biological science and geotechnical engineering are combined, and the content of organic matters in soil is reduced by using microorganisms, so that the engineering property of foundation soil is improved; 2) the construction is simple and convenient, no noise and vibration exist, the technical treatment cost is low, and a new means is provided for the treatment of the low-decomposition-degree peat soil foundation.
Drawings
FIG. 1 is a schematic plan view of the feed and withdrawal pipes of the present invention;
FIG. 2 is a schematic cross-sectional view of the foundation treatment of the present invention;
FIG. 3 is a schematic flow chart of the operation of the foundation treatment of the present invention;
the reference numbers in the figures: 1-a feed pipe; 2-a material pumping pipe; 3-microbial growth promoting nutrient solution; 4-feed direction; 5-direction of nutrient solution diffusion; 6-water pump; 7-water suction pipe.
Detailed Description
The invention will be further described with reference to the following figures and examples, without however restricting the scope of the invention thereto.
Example 1: as shown in fig. 1 to 3, a microbial treatment method for a low-decomposition-degree peat soil foundation includes: preparing a microbial growth promoting nutrient solution 3; vertically arranging a feeding pipe 1 and a pumping pipe 2 in the target foundation soil; thirdly, microorganism growth promoting nutrient solution 3 is poured into the feeding pipe 1, the mixture of the microorganism growth promoting nutrient solution 3 and other filter liquor is pumped out from the pumping pipe 2 and then is poured into the feeding pipe 1 again, and the circulation of the microorganism growth promoting nutrient solution in the soil is realized; and fourthly, after the target foundation is treated, directly pumping out the mixture of the microorganism growth promoting nutrient solution 3 and other filtrate by using the pumping pipe 2, treating and discharging.
Further, the configuration of the microbe growth promoting nutrient solution 3 may be set: mixing starch, glucose, urea and potassium dihydrogen phosphate according to a mass ratio of 100:10:5:1 to obtain a mixed substance; and adding the mixed substances into deionized water according to the mass ratio of 1:100, and fully and uniformly stirring to obtain the microbial growth promoting nutrient solution 3.
Furthermore, the feeding pipe 1 and the pumping pipe 2 can be formed by inserting the pipes after being formed by adopting an auger drilling process, and the diameter of the drilled hole is the diameter of the pumping pipe/the feeding pipe; the pumping pipe 2 is arranged 1 meter deeper (i.e. deeper into the soil) than the feeding pipe 1.
Further, the pipe can be made of PVC pipe.
Furthermore, dense-mesh holes can be arranged around the feeding pipe 1 and the pumping pipe 2, so that nutrient solution can be smoothly discharged and entered, and the nutrient solution has a ventilation function; the top of the feeding pipe 1 and the top of the pumping pipe 2 are open, the bottom of the feeding pipe 1 is open, and the bottom of the pumping pipe 2 is closed.
Further, the diameter of the feeding pipe 1 and the pumping pipe 2 can be set to be 120 mm, the distance between the feeding pipes 1 is 1 m in a plane position, and the pumping pipe 2 is arranged at the geometric center of the regular triangle arrangement of the plurality of feeding pipes 1 (that is, each of the plurality of feeding pipes is in the shape of a regular triangle, and the pumping pipe is arranged at the geometric center of the regular triangle).
Furthermore, one end of the feeding pipe 1 and one end of the pumping pipe 2 can be arranged to extend out of the ground, and the pipe tops extending out of the ground are paved by adopting a shielding object (such as a wood board as the shielding object) so as to prevent precipitation and sundries from entering the pipeline.
Further, a water suction pipe 7 extending into the bottom of the pumping pipe 2 can be connected with a water suction pump 6 to pump out the mixture of the microorganism growth promoting nutrient solution 3 and water in the pumping pipe 2.
Example 2: basically the same as example 1, except that: the preparation of the microorganism growth promoting nutrient solution 3 comprises the following steps: mixing starch, glucose, urea and potassium dihydrogen phosphate according to a mass ratio of 150:16:5:1 to obtain a mixed substance; adding the mixed substances into water according to the mass ratio of 1:100, and fully and uniformly stirring to obtain the microbial growth promoting nutrient solution 3. The feeding pipe 1 and the pumping pipe 2 are formed by inserting a pipe after being formed into holes by adopting an auger drilling process; the pumping pipe 2 is arranged 2 m deeper than the feeding pipe 1. The diameter of the feeding pipe 1 and the pumping pipe 2 is 160 mm, the distance between the feeding pipes 1 is 2 m in the plane position, and the pumping pipe 2 is arranged at the geometric center of the plurality of feeding pipes 1 in a square arrangement (as shown in fig. 1).
Example 3: basically the same as example 1, except that: the preparation of the microorganism growth promoting nutrient solution 3 comprises the following steps: mixing starch, glucose, urea and potassium dihydrogen phosphate according to a mass ratio of 200:20:5:1 to obtain a mixed substance; adding the mixed substances into water according to the mass ratio of 1:100, and fully and uniformly stirring to obtain the microbial growth promoting nutrient solution 3. The feeding pipe 1 and the pumping pipe 2 are formed by inserting a pipe after being formed into holes by adopting an auger drilling process; the pumping pipe 2 is arranged 1.2 meters deeper than the feeding pipe 1. The diameter of the feeding pipes 1 and the diameter of the pumping pipes 2 are 140 mm, the distance between the feeding pipes 1 is 2 m in the plane position, and the pumping pipes 2 are arranged at the geometric centers of the plurality of feeding pipes 1 which are arranged in a quincunx shape.
The working principle of the invention is as follows:
in a natural state, soil contains a large number of microorganisms including bacteria, actinomycetes, fungi and the like, and organic substances are energy sources of the microorganisms in the soil. Under the action of microorganisms, organic matters in soil can undergo a complex conversion process, including a mineralization process and a humification process. The microorganisms decompose organic matter and release CO2And the process of inorganics is called mineralization. This process is also a release process of nutrients in organic matter. The reaction mechanism is as follows:
carbohydrates in soil organic matters, such as cellulose, hemicellulose, starch and other sugars, are firstly hydrolyzed into monosaccharides under the action of carbohydrate hydrolytic enzymes secreted by microorganisms:
(C6H10O5)n＋nH2O→nC6H12O6
the monosaccharide produced may be decomposed in different ways due to different environmental conditions and microbial species, and the final products may be different. If aerobic microorganisms decompose under aerobic conditions, the final products are water and carbon dioxide, and the generated heat is large, which is called oxidation. The reaction is as follows:
C6H12O6＋6O2→6CO2＋6H2heat of oxygen + generation
Under the condition of poor ventilation, the microorganism is slowly decomposed under the action of the anaerobic microorganisms to form some reducing gases and organic acids, and the fermentation is called as the condition of less heat generation. The reaction is as follows:
C6H12O6→CH3CH2CH2COOH＋2H2＋2CO2+ heat quantity
4H2＋CO2→CH4＋2H2O
Sufficient oxygen, carbon source, nitrogen source, phosphoric acid and other conditions required for growth are required for the microorganisms in the soil to maintain high quantity and high activity, and the conditions in the foundation soil in a natural state are often difficult to be fully met, so that the capability of the microorganisms for decomposing residual fibers and other organic substances in the peat soil cannot be fully embodied. The low-decomposition-degree peat soil contains a large amount of undecomposed and semi-decomposed residual fibers, and the soil contains a large amount of pores, so that the peat soil has good permeability, and necessary conditions are provided for the nutrient solution to be fully diffused in the soil. The method is characterized in that a microorganism growth promoting nutrient solution is used for providing nutrient substances for microorganisms in the peat soil, meanwhile, a drill hole distributed in a stratum and the nutrient solution provide an aerobic environment for the microorganisms in the soil in the extraction and injection circulation processes, the quantity and activity of the microorganisms in the soil are increased, and the microorganisms are used for decomposing residual fibers in a peat soil layer with low decomposition degree, so that the engineering property of the soil is improved, and the bearing performance of foundation soil is improved.
And carrying out engineering investigation on the treated low-decomposition-degree peat soil foundation, and determining the thickness of the low-decomposition-degree peat soil layer so as to determine the lengths of the feeding pipe and the pumping pipe. The feeding pipe is arranged in a target stratum, a certain amount of microorganism growth promoting nutrient solution 3 is poured into soil through the feeding pipe 1, and the microorganism growth promoting nutrient solution 3 diffuses in the stratum to provide nutrients for microorganisms in the soil; periodically pumping out nutrient solution and other filtrates (such as water) by using a water pump 6, and repeatedly injecting the nutrient solution and other filtrates into a target stratum through a feed pipe; meanwhile, the oxygen content in the soil body and the nutrient solution is increased in the processes of extraction and injection.
While the present invention has been described in detail with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.

Claims (4)

1. A microbial treatment method for a low-decomposition-degree peat soil foundation is characterized by comprising the following steps of: the method comprises the following steps: preparing a microbial growth promoting nutrient solution (3); vertically arranging a feeding pipe (1) and a pumping pipe (2) in the target foundation soil; thirdly, microorganism growth promoting nutrient solution (3) is poured into the feeding pipe (1), the mixture of the microorganism growth promoting nutrient solution (3) and other filtrate is pumped out from the pumping pipe (2) and then is poured into the feeding pipe (1), and the circulation of the microorganism growth promoting nutrient solution in the soil is realized; after the target foundation is treated, directly extracting the mixture of the microorganism growth promoting nutrient solution (3) and other filtrate by using the material extracting pipe (2), treating and discharging;
the preparation of the microorganism growth promoting nutrient solution (3) comprises the following steps: mixing starch, glucose, urea and potassium dihydrogen phosphate according to a mass ratio of 100-200: 10-20: 5:1 to obtain a mixed substance; adding the mixed substances into water according to the mass ratio of 1:100, and fully and uniformly stirring to obtain a microorganism growth promoting nutrient solution (3);
the feeding pipe (1) and the pumping pipe (2) are formed by inserting a pipe after being formed by adopting an auger drilling process; the material pumping pipe (2) is deeper than the material feeding pipe (1) by 1-2 m;
holes are formed in the periphery of the feeding pipe (1) and the pumping pipe (2), the tops of the feeding pipe (1) and the pumping pipe (2) are open, the bottom of the feeding pipe (1) is open, and the bottom of the pumping pipe (2) is closed;
the diameter of the inlet pipes (1) and the diameter of the pumping pipes (2) are 120-160 mm, the distance between the inlet pipes (1) is 1-2 m on the plane position, and the pumping pipes (2) are arranged at the geometric centers of the plurality of inlet pipes (1) which are arranged in a regular triangle and a square.
2. The microbial treatment method of peat soil ground of low resolution as claimed in claim 1, characterized in that: the pipe is a PVC pipe.
3. The microbial treatment method of peat soil ground of low resolution as claimed in claim 1, characterized in that: one end of the feeding pipe (1) and one end of the pumping pipe (2) extend out of the ground, and the top of the pipe extending out of the ground is paved by adopting a shielding object.
4. The microbial treatment method of peat soil ground of low resolution as claimed in claim 1, characterized in that: the water suction pipe (7) extending into the bottom of the material pumping pipe (2) is connected with a water suction pump (6) to pump out the mixture of the microorganism growth promoting nutrient solution (3) and water in the material pumping pipe (2).
CN201810454896.9A 2018-05-14 2018-05-14 Microbial treatment method for low-decomposition-degree peat soil foundation Active CN108894208B (en)

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CN110016907B (en) * 2019-03-11 2021-04-20 昆明理工大学 Method for improving peat soil foundation by microbial technology

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5022293B2 (en) * 2008-04-23 2012-09-12 大成建設株式会社 Ground improvement method using microorganisms
CN104452740A (en) * 2014-11-21 2015-03-25 淮海工学院 Method for reinforcing and treating liquefied sandy soil foundation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5022293B2 (en) * 2008-04-23 2012-09-12 大成建設株式会社 Ground improvement method using microorganisms
CN104452740A (en) * 2014-11-21 2015-03-25 淮海工学院 Method for reinforcing and treating liquefied sandy soil foundation

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