Method of reinforcing and protecting loess slope surface based on microorganism mineralization

A technology of microorganisms and loess, applied in chemical instruments and methods, soil protection, excavation, etc., can solve the problems of difficult to achieve large volume, high strength and uniformity, reduce rainfall infiltration, small permeability coefficient, and improve resistance. The effect of erosion properties

Inactive Publication Date: 2020-06-09
NORTHWEST A & F UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of them are currently in the laboratory research stage, and there are few practical engineering applications. The main reason is that it is difficult to achieve large volume, high strength and uniformity in soil reinforcement by microbial mineralization.

Method used

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  • Method of reinforcing and protecting loess slope surface based on microorganism mineralization
  • Method of reinforcing and protecting loess slope surface based on microorganism mineralization
  • Method of reinforcing and protecting loess slope surface based on microorganism mineralization

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Embodiment

[0042] This embodiment reinforces and protects the loess slope excavated by a project in northern Shaanxi. The slope height of the loess slope is 3m, the slope ratio is 1:0.75, and the slope soil is uniform. Collect loess soil samples on the surface of the slope, and measure the dry density ρ of the soild 1.35g / cm 3 , the natural moisture content is 12%, and the specific gravity of soil particles is 2.71, which belongs to Q 3 loess. Calculation of surface loess natural void ratio e and saturation S r as follows:

[0043]

[0044]

[0045] Because the slope is steep and sunny, it is difficult to use plants to protect the slope. In order to prevent the slope from being eroded by rainwater, causing water damage on the slope and the risk of rainfall infiltration, the slope is stable. Therefore, the method of microbial mineralization is used to treat the loess slope. Reinforced protection. The thickness D of the designed solidified loess is 2cm, the solidified slope is 3...

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Abstract

The invention discloses a method of reinforcing and protecting a loess slope surface based on microorganism mineralization. Based on a principle that microorganisms induce a calcium carbonate precipitate, a urease-producing bacterium solution and a cementing fluid are sprayed to the loess slope surface, and urea is hydrolyzed by means of urease secreted by urease bacteria to generate carbonate ions and hydroxyl ions. Thus, in an alkaline environment, the carbonate ions are combined with calcium ions provided by calcium chloride to generate a calcium carbonate precipitate. The precipitate is mostly in a crystal state by taking the urease bacteria as a core. As the urease bacteria are attached to the surfaces of loess particles, calcium carbonate crystals and the loess particles are cementedtogether to cure loess to form a firm soil mass with certain strength and erosion resistance. By curing a soil layer of certain thickness on the surface of the loess slope surface, the shear strengthof the loess slope surface soil mass is improved, rainfall infiltration is reduced, erosion of the slope surface is prevented, the stability of a loess slope is improved, and a role of reinforcing and protecting the slope surface is played. The method is simple to construct, good in durability, environment-friendly and energy-saving and suitable for being popularized and applied.

Description

technical field [0001] The invention belongs to the technical field of loess slope engineering reinforcement, and relates to a method for reinforcing and protecting loess slopes based on microbial mineralization. Background technique [0002] Landslides are a common geological disaster in mountainous areas. Loess is more prone to slope erosion and landslides under rainfall infiltration conditions due to its large pores, vertical joints, and unsaturated characteristics. Therefore, the reinforcement and protection of loess slopes is an important scientific issue in the field of soil and water conservation and geotechnical engineering. Microbial mineralization and soil reinforcement is a new geotechnical reinforcement technology. The most researched method is the method of microorganism-induced calcium carbonate precipitation to stabilize soil. This technology has the advantages of clear principle, simple operation, environmental protection and energy saving, high strength, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/20E02D3/12C09K17/40
CPCC09K17/40E02D3/12E02D17/20E02D2300/0045
Inventor 田堪良张慧莉王怀星杨傲秋王晓东马蓓青
Owner NORTHWEST A & F UNIV
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