Construction method for ecological protection of expansive soil slope by using phosphogypsum and microbial mineralization technology

A construction method and microbial technology, applied in the field of slope engineering, can solve the problems of secondary slump and high cost, and achieve the effects of preventing shallow landslides, reducing pollution and simple construction methods.

Pending Publication Date: 2020-07-17
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the one hand, these methods are expensive, and on the other hand, the gray protective design forms a large contrast with the surrounding landscape, and it is easy to cause the risk of secondary landslides

Method used

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Embodiment

[0017] Embodiment: A kind of construction method that utilizes phosphogypsum and microbial mineralization technology to be used for the ecological protection of expansive soil slope, comprises the following steps:

[0018] (1) Preparation of culture medium and microbial solution: weigh 8kg soybean meal, 2kg (NH 4 ) 2 SO 4 , 0.71 kg Na 2 HPO 4 , 8kgNaOH, prepared as a medium mixed solute, mixed the medium mixed solute with 200kg water to prepare a liquid medium, sealed and sterilized the liquid medium in an autoclave at 121°C for 25 minutes, then cooled to 30°C for later use 1. Add 2L of Bacillus Pasteurella liquid to the liquid medium to make a microbial solution, put the microbial solution into a constant temperature shaking incubator at 30°C, and shake it at 200 rpm for more than 24 hours until the microbial solution is within the bar. OD of Bacillus 600 is 1.5;

[0019] (2) Preparation of cementing liquid: weigh 240kg of urea and 120kg of calcium chloride, mix with wa...

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Abstract

The invention discloses a construction method for ecological protection of an expansive soil slope by utilizing phosphogypsum and a microbial mineralization technology, which is characterized by comprising the following steps: (1) putting a bacillus pasteurianus into a culture medium to prepare a microbial solution, and mixing urea, calcium chloride and water to prepare a cementing solution; (2) mixing phosphogypsum, fly ash and soil into a mixture, then uniformly mixing and stirring the mixture, the microbial solution and the water, then adding the cementing solution and mixing with water toprepare an improved mixture slurry; and (3) spraying the improved mixture slurry to the surface of the side slope by adopting a wet spraying method, and covering a non-woven fabric and binding firmly.The method disclosed by the invention can meet the requirements of ecological greening of a slope, rainwater erosion resistance and shallow landslide prevention, can consume phosphogypsum, reduce theoccupation of cultivated land, and can promote plant growth with effective phosphorus. The low-cost culture medium is adopted for the microbial culture, so that the use cost is reduced, the microorganisms-modified phosphogypsum can solidify harmful elements, and the pollution to the environment is reduced.

Description

technical field [0001] The invention relates to the field of slope engineering, in particular to a construction method for ecological protection of expansive soil slopes using phosphogypsum and microbial mineralization technology. Background technique [0002] Expansive soil contains rich clay minerals such as montmorillonite and illite, which have the characteristics of swelling when it encounters water and shrinking when it loses water. Under the condition of rainfall, the excavated slope has weak anti-erosion ability and is prone to progressive cracking, which will lead to shallow landslide disasters in expansive soil. The traditional methods mostly adopt engineering measures such as arched slope protection, sash beam slope protection, mortar rubble slope protection and so on. On the one hand, these methods are expensive, on the other hand, the gray protective design forms a large contrast with the surrounding landscape, and is likely to cause secondary landslide risks. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20C04B28/14A01G20/00C12N1/20C12R1/07
CPCA01G20/00C04B28/143C04B2201/20C12N1/20E02D17/202C04B14/361C04B18/141C04B22/124C04B24/2652C09K17/40C09K17/42E02D3/005E02D17/18E02D17/20Y02A10/23C09K17/06C09K17/10C12N2500/05E02D2300/0076
Inventor 李志清
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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