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Chemical modifying method for swelled ground treatment

A chemical modifier and expansive soil technology, applied in the field of geotechnical engineering, can solve problems such as affecting the ecological environment and polluting groundwater, and achieve the effects of changing multiple fissures, improving the structure of expansive soil, and improving hydrophilic properties

Inactive Publication Date: 2007-10-31
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

[0004] 2. Traditional methods of treating expansive soil
However, the incorporation of lime will pollute the groundwater to a certain extent and affect the ecological environment.

Method used

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  • Chemical modifying method for swelled ground treatment
  • Chemical modifying method for swelled ground treatment
  • Chemical modifying method for swelled ground treatment

Examples

Experimental program
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Embodiment Construction

[0029] Specific implementation examples

[0030] According to the geotechnical test analysis, the physical and mechanical properties of the expansive soil in the field test section before and after modification are shown in Table 1. The liquid limit of the modified soil becomes smaller, the plastic limit increases, and the plasticity index decreases by more than 40%, which shows that the hydrophilicity of the modified soil is greatly weakened. The free expansion rate is an important index to reflect the characteristics of expansive soils. It can be seen from Table 1 that expansive soils have been reduced from medium expansion to below 40%, which has reached the requirement of being modified into non-expansive soils. The clay content of <0.002mm in the particles decreased obviously, indicating that the specific surface area of ​​the soil decreased and the degree of dispersion of soil particles decreased.

[0031]

soil sample

Natural

Water / %

liqui...

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PUM

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Abstract

The invention discloses a chemical improved method to harness swelled ground, which comprises the following steps: allocating swelled ground PAS chemical modifying agent with silicate of soda + basic ion polyacrylamide + water; spraying modifying agent on swelled ground body; changing, linking, bundling, birdnesting, and jelling with ground body particle ion; forming space network structure; increasing physical mechanics property and engineering feature of swelled ground; meeting engineering construction demand of swelled ground. This invention possesses good water stable effect and even modification, which is fit for construction foundation treatment, highway engineering earth bank, slope harness and so on swelled ground project.

Description

technical field [0001] The invention relates to the field of geotechnical engineering, and relates to a chemical improvement method for treating expansive soil, that is, using a PAS chemical modifier to improve and treat expansive soil to improve its physical and mechanical properties and meet engineering design and construction requirements. Background technique [0002] 1. Properties and hazards of expansive soil [0003] Expansive soil is a geological body with many cracks and significant expansion and contraction formed in the natural geological process. Expansive soils are widely distributed in my country, and their clay components are mainly composed of strongly hydrophilic minerals montmorillonite and illite. The property of expansive soil to absorb water, expand, lose water, shrink and deform repeatedly, and its chaotically distributed cracks inside have serious damage to engineering buildings, especially light buildings, roadbeds, cutting slopes, etc., and the defo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/18C09K17/02C09K103/00
Inventor 胡瑞林李志清
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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