Method for reinforcing and improving expansive soil by using microbial composite fibers

A technology of composite fiber and fiber reinforcement, applied in the direction of microorganism-based methods, biochemical equipment and methods, microorganisms, etc., can solve the problems that expansive soil treatment methods cannot meet engineering needs, etc.

Inactive Publication Date: 2021-05-18
CHINA INST OF WATER RESOURCES & HYDROPOWER RES +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above technical problems, the purpose of the present invention is to solve the problem that the traditional expansive soil treatment method cannot meet the engineering needs. The present invention aims

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  • Method for reinforcing and improving expansive soil by using microbial composite fibers
  • Method for reinforcing and improving expansive soil by using microbial composite fibers
  • Method for reinforcing and improving expansive soil by using microbial composite fibers

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Embodiment Construction

[0027] In the following detailed description, certain exemplary embodiments of the present invention are shown and described, simply by way of illustration.

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] figure 1 It is a flowchart of a method for improving expansive soil by using microbial composite fiber reinforcement according to a preferred embodiment of the present invention.

[0030] Such as figure 1 Described, the method for solidifying expansive soil according to the present invention comprises:

[0031] S1: Excavate the expansive soil that needs to be improved, dry it, vibrate it, and sieve it;

[0032] S2: Microbial strains (such as Bacillus pasteuriani, No. ATCC 11859) are cultured in a fermenter for 24 hours according to the optimal culture conditions to form microbial bacterial liquids. Optimum culture conditions: 10% inoculation ratio, 30°C culture temperature PH=8.0 culture medium environ...

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Abstract

The invention discloses a method for reinforcing and improving expansive soil by using microbial composite fibers. The method comprises the following steps that microbial strains are cultured in a fermentation tank according to optimal culture conditions to form a microbial bacterial solution; the microbial bacterial liquid is mixed with mixed calcium liquid which is 1.5 times of the volume of the bacterial liquid, and mixing and stirring are carried out in a low-speed stirrer to form microbial slurry; a reinforced material is added, and the reinforced material is uniformly mixed with the expansive soil to form fiber reinforced expansive soil; and the microbial slurry and the fiber-reinforced expansive soil are uniformly mixed and stirred in batches according to the weight ratio of 1 to 5 in the low-speed stirrer according to the water content of 20%, and curing is carried out at normal temperature to obtain the improved expansive soil.

Description

technical field [0001] The invention belongs to the field of water conservancy engineering, geotechnical engineering or foundation building material disposal, and relates to a method for improving expansive soil, in particular to a method for improving expansive soil by using microbial composite fiber reinforcement. Background technique [0002] Expansive soil is a typical type of unsaturated soil. The clay content of its particle composition exceeds 30%. It is mainly composed of strongly hydrophilic montmorillonite, illite and kaolinite. Typical characteristics such as shrinkage and cracking, because the "three properties" (cracks, expansion and contraction, and over-consolidation) of expansive soil have a strong attenuation effect on its strength, making the engineering performance of expansive soil extremely poor. Many water conservancy projects, highways, etc. Various engineering geological problems caused by expansive soils are generally encountered in mines, mines and ...

Claims

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Application Information

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IPC IPC(8): E02D3/12E02D17/20E02B3/12C12N1/20C12R1/07
CPCC12N1/20E02B3/12E02D3/12E02D3/126E02D17/20
Inventor 李娜赵卫全张银峰周建华
Owner CHINA INST OF WATER RESOURCES & HYDROPOWER RES
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