Landslide prevention and control method based on microbial mineralization

A mineralization and microbial technology, used in excavation, soil protection, climate change adaptation, etc., can solve problems such as large soil disturbance and complex construction methods, and achieve good control effects, good drainage performance, and high environmental protection. Effect

Active Publication Date: 2022-01-04
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The construction method of this method is relatively complicated, the disturbance to the soil is large, and no solution is provided on how to prevent and control soil landslides

Method used

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  • Landslide prevention and control method based on microbial mineralization
  • Landslide prevention and control method based on microbial mineralization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Such as figure 1 As shown, there is a sliding body 2 on the bedrock 1, and a sliding surface 3 is provided on the surface of the sliding body 2. Slide body 2 is the main treated soil in this embodiment, with a 25° slope, silty clay, and a soil permeability coefficient of 5×10 -6 cm / s, the ambient temperature of the project is 25°C, the project requirement is to prevent and control landslides, and the stability of the slope is relatively good.

[0097] 1) Slowly and evenly spray the urease-producing microbial bacterial liquid on the surface of the soil to block surface cracks 11, and the spraying area is as follows: figure 1 As shown in the surface curing layer 7, the spraying amount is 100L / m 2 ; After an interval of 1 day, slowly and evenly spray the cementing liquid to the soil, and the spraying amount is 100L / m 2 . Bacillus sarcina pasteurii was used as the microbial liquid, culture medium (1 L) 20 g of yeast extract, 10 g of ammonium sulfate, 15.75 g of tris (Tr...

Embodiment 2

[0103] The soil in this example is a 35° slope, clay, and the soil permeability coefficient is 1×10 -6 cm / s, the ambient temperature of the project is 25°C, the project requirement is to prevent and control landslides, and the stability of the slope is relatively poor.

[0104] 1) Slowly and evenly spray the urease-producing microbial bacterial solution on the soil surface, and the spraying rate is 150L / m 2 ; After an interval of 1.5 days, slowly and evenly spray the cementing liquid to the soil, and the spraying amount is 150L / m 2 . Use the conductivity method to control the enzyme activity level of the bacterial solution to 1.5mS / (cm min -1 ), using a spectrophotometer to control the absorbance value OD of the bacterial solution concentration at a wavelength of 600nm 600 is 3.0Abs. The cementing liquid is 1.5M urea, 1.5M calcium chloride and 3.0g / L nutrient broth. The microbial bacterial liquid and cementing liquid in subsequent steps are consistent with this step. Rep...

Embodiment 3

[0110] The soil in this embodiment is a 30° slope, silt, and the soil permeability coefficient is 8×10 -5 cm / s, the ambient temperature of the project is 25°C, the project requirement is to prevent and control landslides, and the stability of the slope is relatively good.

[0111] 1) Slowly and evenly spray the urease-producing microorganism liquid on the soil surface, the spraying rate is 80L / m 2 ; After an interval of 1.0d, slowly and evenly spray the cementing fluid to the soil, and the spraying amount is 160L / m 2 . Use the conductivity method to control the enzyme activity level of the bacterial solution to 2.0mS / (cm min -1 ), using a spectrophotometer to control the absorbance value OD of the bacterial solution concentration at a wavelength of 600nm 600 is 3.0Abs. The cementing liquid is 0.5M urea, 0.5M calcium chloride and 3.0g / L nutrient broth. The microbial bacterial liquid and cementing liquid in subsequent steps are consistent with this step. Repeat the above s...

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Abstract

The invention belongs to the crossing field of geotechnical engineering and microbial engineering, and particularly relates to a landslide prevention and control method based on microbial mineralization. The landslide prevention and control method comprises the steps that microbial liquid and cementing liquid are sequentially added to the surface of a soil body and the potential sliding face of the soil body, and meanwhile sand anti-slide piles and sand lattices are prepared in the soil body through the microbial liquid and the cementing liquid; and a sand drainage ditch and a sand intercepting ditch are arranged in the soil body, the microbial liquid and the cementing liquid are sequentially sprayed to the sand drainage ditch and the sand intercepting ditch, and the purpose of stabilizing the soil body is achieved. According to the landslide prevention and control method, landslide prevention and control are conducted from multiple angles, considered factors are comprehensive, the prevention and control effect is good, adopted bacteria widely exist in the soil body in the nature, and the environment coordination is good; chemical substances used in the adopted microbial liquid and the cementing liquid are non-toxic and harmless substances, and the environment friendliness is high; and used sand is originally existing substances in the nature, and influences hardly exist on the environment.

Description

technical field [0001] The invention belongs to the intersection field of geotechnical engineering and microbial engineering, and more specifically relates to a landslide prevention and control method based on microbial mineralization. Background technique [0002] Landslide is a natural phenomenon, which is a common phenomenon of mountain deformation in hills and mountains, and is also common in rivers, lakes and coasts in plain areas. In the past hundred years, many countries in the world have recorded landslide disasters, which have different degrees of harm to the economic construction of each country. my country is a country where landslide disasters occur very frequently and disaster losses are extremely serious, especially in the southwestern mountainous areas of China and the low mountain and hilly areas along the southeastern coast of my country, which are located on the southeastern edge of the Qinghai-Tibet Plateau. Landslides often interrupt traffic, block river...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D3/12E02D3/00E02D5/74E02D31/02E03F3/04
CPCE02D17/20E02D17/207E02D3/12E02D3/00E02D5/74E02D31/02E03F3/046E02D2600/30Y02A10/23
Inventor 唐朝生程瑶佳泮晓华程青吕超王殿龙董志浩章君政
Owner NANJING UNIV
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