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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

Inactive Publication Date: 2013-07-03
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to overcome the defects of the above-mentioned large amount of cement lime and heavy pollution of blast furnace slag. The present invention provides a method for improving expansive soil and its construction method, which can effectively solve the expansion and contraction deformation zone of expansive soil. It is easy to popularize the roadbed failure problem and improve the strength of expansive soil

Method used

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  • Method for improving expansive soil and construction method thereof
  • Method for improving expansive soil and construction method thereof
  • Method for improving expansive soil and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Mixed soil preparation, take the preparation of 1.15kg mixed soil as an example. The process steps of mixed soil preparation are as follows: (1) the dry soil mass of the expansive soil to be improved is 1.0 kg, and the required blast furnace slag mass is weighed at a ratio of 15% to 0.15 kg; After uniformity, the optimum moisture content obtained from the medium-duty compaction test of "Highway Soil Test Regulations" (JTJ-051-93) is 19%, and 1.15kg×0.19=218g of water is added to the mixed soil and mixed evenly The blast furnace slag-modified soil can be obtained by preventing the formation of pimples.

[0048] The steps of the improved construction method are: after unloading the modified blast furnace slag-modified soil to the designated place, spread it evenly, with a thickness of 30-35cm; after checking that the moisture content meets the requirements of the optimal moisture content, use a road roller to quickly statically press the soil And precise leveling; rollin...

Embodiment 2

[0067] A method for improving weak expansive soil with blast furnace slag, the steps are:

[0068] The first step is to weigh blast furnace slag and expansive soil at a ratio of 17% of the slag mixing rate, and mix them evenly;

[0069] The second step is to determine the optimum water content of the mixed soil through experiments;

[0070] The third step is to keep the water content of the mixed soil obtained in the first step at the optimum water content by digging, drying and adding water. After mixing evenly, it is stuffed under natural conditions for 5 to 7 days, so that you can get the soil after mixing. Modified soil after blast furnace slag improvement.

[0071] Using the method for improving expansive soil with blast furnace slag to obtain a construction method for improving expansive soil with blast furnace slag, the construction steps are:

[0072] The first step is to unload the modified blast furnace water slag modified soil to the designated place and spread it...

Embodiment 3

[0076] A method for improving expansive soil with blast furnace slag, the steps are:

[0077] The first step is to weigh blast furnace slag and expansive soil according to the ratio of 20% slag mixing rate, and mix them evenly;

[0078] The second step is to determine the optimum moisture content of the mixed soil sample through experiments;

[0079] The third step is to keep the water content of the mixed soil obtained in the first step at the optimum water content by digging, drying and adding water. After mixing evenly, it is stuffed under natural conditions for 5 to 7 days, so that you can get the soil after mixing. Modified soil after blast furnace slag improvement.

[0080] Using the method for improving expansive soil with blast furnace slag to obtain a construction method for blast furnace slag modified soil, the construction steps are:

[0081] The first step is to unload the modified blast furnace water slag modified soil to the designated place, spread evenly, and...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/12C09K17/08C09K103/00
Inventor 孙树林唐俊郑青海
Owner HOHAI UNIV
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