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Method for modifying swelling soil through iron tailing fine sand and construction method thereof

A technology of iron tailing fine sand and expansive soil, which is applied in the improvement and construction of expansive soil, and in the field of optimal iron tailing fine sand content, can solve the problems of expansion, shrinkage, deformation and damage of expansive soil fillers, and achieve pollution reduction, short construction period, The effect of physical and mechanical property index improvement

Inactive Publication Date: 2015-10-21
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides an expansive soil treatment method that is safe, applicable, advanced in technology, economical and friendly (environmental protection), which can effectively improve the strength of expansive soil and solve the problem of swelling, shrinkage, deformation and damage of expansive soil filler, and is easy to popularize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Indoor test configuration steps of expansive soil modified with iron tailing fine sand:

[0032] (1) Get 50kg of representative expansive soil with natural moisture content, crush it, pass through a 20mm sieve, mix the soil sample under the sieve, and measure the natural moisture content of the soil sample; weigh 30% of the mass of soil particles in the expansive soil ( Defined as iron tail fine sand mixed with iron tail fine sand (30%), and it is mixed with expansive soil evenly to obtain mixed soil;

[0033] (2) According to the plastic limit w of the mixed soil P It is estimated that the optimal moisture content of the mixed soil with iron tailing fine sand mixing ratio of 30% is less than its plastic limit of 4.0%, and the estimated optimal moisture content "w P -4.0%" is the middle value to prepare 5 mixed soil samples with different moisture contents to form a sample group, the difference between two adjacent moisture contents should be 2.5%; mix the above five m...

Embodiment 2

[0040] Indoor test configuration steps of expansive soil modified with iron tailing fine sand:

[0041] (1) Get 50kg of representative expansive soil with natural moisture content, crush it, cross a 20mm sieve, mix the soil sample under the sieve, and measure the natural moisture content of the soil sample; take by weighing 40% of the mass of soil particles in the expansive soil iron tail fine sand, and mix it with expansive soil evenly to obtain mixed soil;

[0042] (2) According to the plastic limit w of the mixed soil P It is estimated that the optimal water content of the mixed soil with iron tailing fine sand mixing ratio of 40% is less than its plastic limit of 3.0%, and the estimated optimal water content "w P -3.0%" is the middle value to prepare 5 mixed soil samples with different moisture contents to form a sample group, and the difference between two adjacent moisture contents should be 2.0%; mix the above five mixed soils with different moisture contents Finally,...

Embodiment 3

[0049] Indoor test configuration steps of expansive soil modified with iron tailing fine sand:

[0050] (1) Get 50kg of representative expansive soil with natural moisture content, crush it, cross a 20mm sieve, mix the soil sample under the sieve, and measure the natural moisture content of the soil sample; take by weighing 50% of the mass of soil particles in the expansive soil iron tail fine sand, and mix it with expansive soil evenly to obtain mixed soil;

[0051] (2) According to the plastic limit w of the mixed soil P It is estimated that the optimal water content of the mixed soil with iron tailings fine sand mixing ratio of 50% is less than its plastic limit of 2.0%, and the estimated optimal water content "w P -2.0%" is the middle value to prepare 5 mixed soil samples with different moisture contents to form a sample group, the difference between two adjacent moisture contents should be 2.0%; mix the above five mixed soils with different moisture contents Finally, ac...

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Abstract

The invention discloses a method for modifying swelling soil through iron tailing fine sand and a construction method thereof. The method for modifying swelling soil through iron tailing fine sand comprises uniformly mixing iron tailing fine sand and swelling soil to be modified according to a formula to obtain mixed soil, determining the optimal moisture content of the mixed soil through a heavy compaction test, making the moisture content of the mixed soil be the optimum through humidifying or drying, and closing the mixed soil to obtain the iron tailing fine sand modified swelling soil. The method for modifying swelling soil through iron tailing fine sand can effectively raise the strength of the swelling soil, the problem that deformation of filling material of swelling soil may damage the swelling soil can be solved. The modified soil can used as filling material used in buildings, railways, roads, airports, water conservancy engineering and the like in swelling soil areas, so the method is significant in economic benefit and engineering construction.

Description

1. Technical field [0001] The present invention relates to an improvement and construction method of expansive soil, in particular to the resource utilization of industrial waste iron tailing fine sand, and its optimum requirements for improving the strength of expansive soil and reducing the expansion and contraction deformation of expansive soil. The method for optimizing the content of iron tail fine sand belongs to the technical field of geological disaster treatment and geotechnical engineering. 2. Background technology [0002] Expansive soil is a special cohesive soil with high liquid limit, which has special properties such as water absorption expansion and disintegration, water loss shrinkage, multiple cracks, over-consolidation, and sensitivity to environmental humidity and heat changes. Buildings, railways, highways, airports, and water conservancy projects in expansive soil areas often suffer huge damage and cause huge economic losses. my country is one of the c...

Claims

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Application Information

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IPC IPC(8): E02D3/12C09K17/08
Inventor 储诚富陈天虎汪忠明查甫生董满生
Owner HEFEI UNIV OF TECH
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