Method for improving expansive soil and construction method thereof

A construction method and expansive soil technology, applied in soil protection, chemical instruments and methods, fertilization devices, etc., to achieve excellent physical properties, increase compactness, and save engineering costs
CN103184733AInactive Publication Date: 2013-07-03HOHAI UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HOHAI UNIV
Publication Date
2013-07-03
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a method for improving expansive soil and a construction method thereof. The method for improving expansive soil comprises the following steps of: 1) at the mass ratio of 15-20% of modifying agent and dry soil, evenly stirring the modifying agent and expansive soil to obtain composite soil; 2) determining the optimal moisture content of the composite soil; 3) regulating the moisture content of the composite soil obtained in step 1) to keep at the optimal moisture content; and under the natural condition, tightly covering materials to obtain the improved expansive soil. The method is characterized in that the modifying agent is blast furnace grain slag, and the blast furnace grain slag comprises the following main chemical ingredients in parts by mass: 38-43% of CaO, 33-38% of SiO2, 15-16% of Al2O3 and 4-8% of MgO. According to the improved expansive soil, the expansibility of the expansive soil can be eliminated, the water stability of the expansive soil is improved, and the strength required by the engineering is satisfied.
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Description

technical field

[0001] The invention relates to an expansive soil improvement and construction method, and belongs to the technical fields of geological disaster treatment and geotechnical engineering. Background technique

[0002] So far, the improvement methods of expansive soil mainly include: compaction method, physical improvement method, chemical improvement method, moisture retention method, soil replacement method and biological improvement method.

[0003] (1) The compaction method is to compact the expansive soil to the required density. The compaction method is low in cost, but has certain applicability limitations. It is generally suitable for weak expansive soil foundations. After compaction, the density of the expansive soil foundation will increase, and the cohesion and internal friction angle will also increase, and the bearing capacity of the foundation will increase.

[0004] (2) Physical improvement methods include soil nailing walls, pile foundations, ad...

Claims

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