A method for improving peat soil foundation by microbial technology

A microbial technology and soil foundation technology, which is applied in the field of peat soil foundation improvement by microbial technology, can solve problems such as large vibration and noise, poor drainage and consolidation effect, and impact on buildings and the environment

Inactive Publication Date: 2021-04-20
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have certain limitations in the treatment of peat soil foundations. For example, for peat and saturated soft soils in flow-plastic state with minimal water permeability, under a small load, the foundation soil will experience large shear creep. The drainage consolidation effect is poor, so it is not suitable to only use the sand well method
The dynamic compaction method is used to deal with gravel soil, sandy soil, low-saturation silt and cohesive soil, miscellaneous fill, collapsible loess and other foundations, and generally can achieve better results. For soft soil foundations, generally The treatment effect is not significant, and the vibration and noise are large during construction, which will affect the surrounding buildings and environment

Method used

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  • A method for improving peat soil foundation by microbial technology
  • A method for improving peat soil foundation by microbial technology

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: as Figure 1~2 As shown, a method for improving peat soil foundation by microbial technology, the specific steps are as follows:

[0023] (1) Level the site, and then lay out 9 pumping wells 2 and 4 water injection wells 1 in the peat soil foundation to be treated. The 9 pumping wells 2 are divided into three rows and arranged in a rectangular shape, with 3 pumping wells in each row. For water wells, four water injection wells 1 are arranged in two rows, and each row of water injection wells 1 is respectively located in the center of two adjacent rows of pumping wells 2;

[0024] (2) Each row of pumping wells 2 is connected to the PVC main pipe Ⅰ3 through the PVC branch pipe 4, and the PVC main pipe Ⅰ3 in each row is connected to the PVC main pipe Ⅱ8 to form an independent pumping system. The water injection well 1 in each row is connected to the PVC main pipe 4 through the PVC branch pipe 4. The PVC main pipe Ⅲ10 is connected, and the PVC main pipe Ⅲ10 o...

Embodiment 2

[0039]Embodiment 2: This embodiment is the same as Embodiment 2, the difference is that the amplified bacteria liquid 5 is preferably amplified from the foundation soil by native microorganisms, injected from the water injection system, extracted by the pumping system, and injected into the water injection well 1 There is a water head difference between the pumping well 2, so that the amplified bacterial solution 5 forms seepage in the peat soil to be treated, flows evenly through the peat soil layer to be treated, the bacteria are adsorbed in the soil, and the nutrient solution is injected through the water injection well 1 to maintain the soil. The number and activity of microorganisms in the In addition, soil samples are taken regularly to detect the number of bacteria in the soil, and if necessary, the number of bacteria in the soil can be supplemented by injecting a high-concentration bacterial solution.

Embodiment 3

[0040] Embodiment 3: This embodiment is the same as Embodiment 2, the difference is that the amplified bacteria liquid 5 is amplified by the introduction of foreign microorganisms, injected from the water injection system, extracted by the pumping system, and injected into the water injection well 1 and the pumping system. A water head difference is formed between the two wells, so that the amplified bacterial liquid 5 forms seepage in the peat soil to be treated, flows evenly through the peat soil layer to be treated, the bacteria are adsorbed in the soil, and the nutrient solution is injected through the water injection well 1 to maintain the microorganisms in the soil. In addition, soil samples are taken regularly to detect the number of bacteria in the soil, and if necessary, the number of bacteria in the soil can be supplemented by injecting a high-concentration bacterial solution.

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Abstract

The invention discloses a method for improving peat soil foundation by microbial technology, which includes: leveling the site, and then laying more than one pumping well and more than one water injection well in the peat soil foundation to be treated, and the more than one pumping well surrounds Arrange more than one water injection well; use PVC pipes to connect the pumping well and water injection well to form an independent pumping system and water injection system; inject the prepared amplified bacteria solution from the water injection system until a certain concentration of amplification is detected from the pumping system The bacterial liquid is extracted; the injection of the amplified bacterial liquid is stopped, and it is left to stand in the peat soil foundation for more than 24 hours; oxygen-containing pure water or other nutrient solutions are injected through the water injection well; soil samples are taken regularly to detect the number of bacteria in the soil; the present invention Combining biotechnology with geotechnical engineering, using microorganisms to degrade the organic matter in the soil, reducing the organic matter content, thereby improving the engineering properties of the foundation soil, this application provides a green, efficient, convenient and low-cost peat soil foundation treatment method .

Description

technical field [0001] The invention relates to a method for improving peat soil foundation by microbial technology, which belongs to the field of soft soil foundation treatment of geotechnical engineering. Background technique [0002] Peat soils are widely distributed all over the world and are rich in organic matter, which is formed by the accumulation of a large number of insufficiently decomposed animal and plant residues under anoxic conditions. The lower the degree of degradation, the more residual fibers contained in the soil; the higher the degree of degradation, the more amorphous humus in the soil. The higher the content of organic matter, the greater the impact on soil quality, mainly manifested in low strength, high compressibility, and different effects on the incorporation of different engineering materials, etc., which will have adverse effects on direct engineering construction or foundation treatment. [0003] There are a large number of microorganisms in ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/00E02D3/10E02D3/12
CPCE02D3/00E02D3/10E02D3/12
Inventor 桂跃吴承坤赵振兴刘锐方超余志华付坚
Owner KUNMING UNIV OF SCI & TECH
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