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A method of using microorganisms to prevent and control soil shrinkage and cracking

A microbial control and soil technology, applied in soil protection, chemical instruments and methods, applications, etc., can solve the problems of difficult quantification of bacterial liquid, cementitious liquid and curing time, and achieve the purpose of reducing the degree of crack development, inhibiting cracking, and improving The effect of environmental coordination

Active Publication Date: 2021-03-30
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem of soil shrinkage and cracking and the technical problem that it is difficult to quantify the bacteria liquid, cementing liquid and curing time in the implementation of existing microbial technology, the present invention provides a method for preventing soil shrinkage and cracking by using microorganisms, which can effectively control the bacteria liquid, cementing liquid, and curing time. The amount of cementing liquid, the calculation of curing time and the prevention of shrinkage and cracking of the soil have many advantages such as convenient construction and ecological environmental protection.

Method used

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  • A method of using microorganisms to prevent and control soil shrinkage and cracking
  • A method of using microorganisms to prevent and control soil shrinkage and cracking
  • A method of using microorganisms to prevent and control soil shrinkage and cracking

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Repair for the soil of fissure development

[0084] Select the underwater soil in the Nanjing area as a test soil, and the wind-dried soil is 1 mm. A plastic petri dish in a diameter of 15 cm (a hole diameter is 3 mm), and the paper is filtered on the bottom pad at the bottom of the culture dish to prevent the soil particles from flowing out, then the 100 g of the soil is poured into the petriper, manually compacted, The thickness of the soil layer is about 0.5 cm in the curing depth D, and the processing area A is 180cm. 2 . Spray the water into the surface of the soil layer until saturated with a watering can (when the water is exudated from the bottom of the culture dish), then the sample is dry to the aqueous content of no change, the final sample moisture content It is 2%, the soil porosity N is 59%, and the viscosid content C is 22%.

[0085] Procedure:

[0086] 1) Take a photo on the surface of the sample, and analyze its fracture rate with CIAS software to obtain th...

Embodiment 2

[0098] Repair for the soil of fissure development

[0099] The test soil adopted in this example is the same as in Example 1, and the repair method is substantially the same, and the difference is that the dry soil mass is 400 g, the curing depth D is about 2 cm, and the soil water head difference H is 2 cm. The fungus spray amount correction coefficient α is 1.5, the ratio of the amount of cementation and the amount of bacteria is 1.0, the bacterial liquid maintenance time correction coefficient β b Take the value of 1.5, the ceiling maintenance time correction coefficient β c The value is 3.0.

[0100] In this example, 4% of the bacterial solution was added to 96% of liquid medium during the preparation of a bacterial liquid to activate 24 hours; the concentration of urea and calcium chloride in the cement solution was 0.5 mol / L.

[0101] Analysis by CIAS software is analyzed by the initial fracture rate R sc For 8%, calculated by relations (2) ~ (5) to obtain the amount of ba...

Embodiment 3

[0104] Repair for the soil of fissure development

[0105] The test soil employed in this embodiment is the same as that of Example 1, and the repair method is substantially the same, and the liquid mass is 1000 g, the solidified depth D is about 5 cm, and the soil water head difference H is 5 cm. The fungus spray amount correction coefficient α is 2.0, the amount of the cementation is used and the ratio of the bacterial liquid is 1.5, and the bacterial liquid maintenance time correction coefficient β b Take the value of 2.0, the ceiling maintenance time correction coefficient β c The value is 5.0.

[0106] In this example, 5% of the bacterial liquid was added to 95% of the liquid medium during the preparation of the bacterial liquid to activate 24 hours; the concentration of urea and calcium chloride in the cement solution was 1.0 mol / L.

[0107] Analysis by CIAS software is analyzed by the initial fracture rate R sc 9%, calculated according to the relationship (2) ~ (5) to obt...

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Abstract

The invention discloses a method for preventing and controlling dry shrinkage cracking of a soil body by using microorganisms, and belongs to the field of microorganism geotechnical engineering. The method comprises the following steps: (1) determining the fracture rate of the soil body; (2) according to the fracture rate in the step (1), the curing depth, the soil porosity and the treatment area,calculating the dosage of a single spraying bacterial liquid, and calculating the dosage of a cementing liquid according to the dosage ratio of the cementing liquid to the bacterial liquid; (3) according to the soil body permeability coefficient, the soil body water head difference and the curing depth and the treatment area in the step (2), calculating the curing time according to the dosage ofthe bacterium liquid or the cementing liquid; (4) spraying a microorganism liquid to the surface of the soil body, and curing according to the bacterial liquid curing time calculated in the step (3);and (5) spraying a cementing liquid on the surface of the soil body, and curing according to the cementing liquid curing time calculated in the step (3). The method can inhibit the dry shrinkage cracking of the surface shallow cohesive soil body, has an obvious repair effect on the cracked soil body surface cracks, and has the advantages of simplicity and convenience in operation, ecology and environmental protection.

Description

Technical field [0001] The present invention belongs to the technical field of microbial geotechnical engineering, and more particularly to a method of using microorganisms to prevent soil and cracking of soil. Background technique [0002] The soil of nature is very prone to dry shrinkage during dry and water, which is a common natural phenomenon. The development of dry shrinkage fissures not only destroys the integrity of the soil, but also changes the engineering properties of the soil. Thereby trigger a series of engineering geological problems and environmental geological issues. For example, the dry shrinkage fissure of the surface development of the soil slope can provide shortcut channels for rainwater, and weaken the strength of deep soil, leading to stability of the slope; the production of dry shrinkage fractures can greatly enhance the permeability of soil, resulting in water conservancy The leakage of the facility and the leakage of pollutants in the landfill and nuc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D3/12C09K17/40
Inventor 唐朝生刘博谢约翰尹黎阳吕超李昊施斌程青
Owner NANJING UNIV
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