Microbial treatment method for peat soil foundation low in decomposition degree

A microbial treatment and decomposition technology, applied to biochemical equipment and methods, microorganisms, microorganisms, etc., can solve the problems of difficult construction, high cost, low strength of peat soil with low decomposition degree, etc., and achieve low technical treatment cost and improved Engineering properties, no noise and vibration effect

Active Publication Date: 2018-11-27
KUNMING UNIV OF SCI & TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have certain limitations when applied to low-decomposition peat soil foundations. For example, the replacement and filling method is suitable for thin problematic soil layers. Difficult to realize; low-decomposition peat soil has extremely low strength and cannot provide strong enough constraints for scattered piles, so the effect of sand pile method is not good; dynamic compaction method cannot be used in urban areas due to vibration during construction; cement In peat soil, it is difficult to hydrate and consolidate to form piles, so the cement-soil mixing method is not effective; therefore, it is urgent to develop a new foundation treatment method based on the characteristics of low-decomposition peat soil to solve the long-term settlement problem of the foundation

Method used

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  • Microbial treatment method for peat soil foundation low in decomposition degree
  • Microbial treatment method for peat soil foundation low in decomposition degree
  • Microbial treatment method for peat soil foundation low in decomposition degree

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: as Figure 1-Figure 3 As shown, a microbial treatment method for low-decomposition peat soil foundations, including: ① preparing microbial growth-promoting nutrient solution 3; ② vertically setting feeding pipe 1 and pumping pipe 2 in the target foundation soil; The microbial growth-promoting nutrient solution 3 is poured into the feed pipe 1, and the mixture of the microbial growth-promoting nutrient solution 3 and other filtrates is extracted from the pumping pipe 2 and refilled into the feed pipe 1 to realize the circulation of the microbial growth-promoting nutrient solution in the soil ; ④ After the target foundation is treated, use the pumping pipe 2 to directly extract the mixture of the microbial growth-promoting nutrient solution 3 and other filtrates and discharge them after treatment.

[0021] Further, the configuration of the microbial growth-promoting nutrient solution 3 can be set: mix starch, glucose, urea, and potassium dihydrogen phosphate...

Embodiment 2

[0028] Embodiment 2: basically the same as Example 1, the difference is: the configuration of the microbial growth-promoting nutrient solution 3: starch, glucose, urea, potassium dihydrogen phosphate, by the quality of 150:16:5:1 Mix in proportion to obtain a mixed substance; add the mixed substance into water at a mass ratio of 1:100, and stir thoroughly to obtain a microbial growth-promoting nutrient solution 3. The feeding pipe 1 and the feeding pipe 2 are formed by inserting pipes after being drilled by an auger drilling process; the feeding pipe 2 is set 2 meters deeper than the feeding pipe 1 . The feed pipe 1 and the feed pipe 2 have a diameter of 160 mm. On a plane position, the distance between the feed pipes 1 is 2 meters, and the feed pipe 2 is arranged at the geometric center where a plurality of feed pipes 1 are arranged in a square ( Such as figure 1 shown).

Embodiment 3

[0029] Embodiment 3: basically the same as Example 1, the difference is: the configuration of the microbial growth-promoting nutrient solution 3: starch, glucose, urea, potassium dihydrogen phosphate, by the quality of 200:20:5:1 Mix in proportion to obtain a mixed substance; add the mixed substance into water at a mass ratio of 1:100, and stir thoroughly to obtain a microbial growth-promoting nutrient solution 3. The feeding pipe 1 and the feeding pipe 2 are formed by inserting pipes after being drilled by an auger drilling process; the feeding pipe 2 is set 1.2 meters deeper than the feeding pipe 1 . The diameter of the feeding pipe 1 and the feeding pipe 2 is 140 mm. On the plane, the distance between the feeding pipes 1 is 2 meters. .

[0030] The working principle of the present invention is:

[0031] In the natural state, soil contains a large number of microorganisms, including bacteria, actinomycetes and fungi, etc., and organic matter is the energy source of microor...

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Abstract

The invention discloses a microbial treatment method for a peat soil foundation low in decomposition degree. The microbial treatment method comprises the steps that 1, a microbial growth promoting solution is prepared; 2, a feeding pipe and a material sucking pipe are vertically arranged in target foundation soil; 3, the feeding pipe is filled with the microbial growth promoting solution, a mixture of the microbial growth promoting solution and other filtrates is sucked out of the material sucking pipe and then is recharged into the feeding pipe, and circulation of the microbial growth promoting solution is achieved; 4, after target foundation treatment is completed, the material sucking pipe is utilized to directly suck out the mixture of the microbial growth promoting solution and otherfiltrates, and discharging is performed after treatment. The method integrates biological science and geotechnical engineering, utilizes microbes to reduce the content of organic matter in the soil and accordingly improves the engineering properties of the foundation soil. Construction is simple and easy, no noise nor vibration is produced, the technical treatment cost is low, and a new means is provided for treatment of peat soil foundations low in decomposition degree.

Description

technical field [0001] The invention relates to a microbial treatment method for low-decomposition peat soil foundation, and belongs to the technical field of biological geotechnical engineering foundation treatment. Background technique [0002] Peat soils are widely distributed all over the world, with a total area of ​​4.153 million km 2 above. Among them, a large part of peat soil belongs to low-decomposition peat soil, which is characterized by a large amount of undecomposed and semi-decomposed residual fibers in the soil. w f Up to 10~30% or more. These residual fibers mainly come from the residues of plant roots, branches and leaves after decomposition. Low-decomposition peat soil has extremely poor engineering geological characteristics such as large void ratio, high natural water content, low bearing capacity, and significant compressibility. It is an unfavorable foundation soil in geotechnical engineering. [0003] There are many ground treatment methods commo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12C12N1/00
CPCC12N1/00E02D3/12
Inventor 桂跃方超吴承坤刘锐刘颖伸杨松徐其福段亮亮
Owner KUNMING UNIV OF SCI & TECH
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