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EPS (expandable polystyrene) improved soil for treating expansive soil slopes and construction method thereof

A construction method and technology of expansive soil, applied in the field of geotechnical engineering, can solve problems such as reducing the sliding force of the slope, and achieve the effects of reducing the load of the slope, reducing the expansion and contraction, reducing the free expansion rate and density

Active Publication Date: 2016-06-08
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it can effectively improve the strength of expansive soil and solve the problem of expansion and contraction deformation of expansive soil; on the other hand, the EPS-improved expansive soil for backfilling slopes is light in weight and has good self-supporting properties, which can reduce the sliding force of the slope and ensure the expansion Stability of Soil Slopes

Method used

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  • EPS (expandable polystyrene) improved soil for treating expansive soil slopes and construction method thereof
  • EPS (expandable polystyrene) improved soil for treating expansive soil slopes and construction method thereof
  • EPS (expandable polystyrene) improved soil for treating expansive soil slopes and construction method thereof

Examples

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Effect test

Embodiment 1

[0032] A kind of EPS improved soil for treating expansive soil slopes. Put the excavated expansive soil, water and cement into a stabilized soil mixer for full mixing and mixing to form a uniformly flowing slurry; add EPS foam particles to the well-mixed In the slurry, continue to stir evenly to obtain EPS improved expansive soil; the particle size of EPS foam particles used in this embodiment is 1-5mm, and the particle packing density is 0.01-0.02g / cm 3 , the pure particle density is 0.02-0.03g / cm 3 . The EPS polystyrene foam particles are pre-expanded polystyrene foam particles.

[0033] The test ratio and the reduction rate of free expansion rate and density reduction rate of expansive soil improved by EPS are shown in Table 1 (Note: The reduction rate of free expansion rate and density reduction rate refer to the corresponding free expansion rate compared with untreated expansive soil rate and percentage of density reduction). It can be seen from the table that EPS impr...

Embodiment 2

[0037] In this embodiment, the expansive soil is the expansive soil excavated from the side slope; the cement is Portland cement with a strength of 42.5MPa; the EPS foam particles are pre-expanded polystyrene foam particles, and the particle size is 1-5mm, particle packing density is 0.01-0.02g / cm 3 , the pure particle density is 0.02-0.03g / cm 3 .

[0038] Construction machinery includes a PC200 excavator and a 300t / h continuous stabilized soil mixer.

[0039] The EPS improved soil for expansive soil slope is formed by mixing polystyrene foam particles, expansive soil, cement and water in proportion, wherein the mass percentages of polystyrene foam particles, cement and water and expansive soil are respectively 2%, 8%, 60% (that is, 2 parts of polystyrene foam particles, 8 parts of cement, 60 parts of water, and 100 parts of expansive soil).

[0040] The construction method is as follows:

[0041] Press with an excavator figure 2 The expansive soil is excavated step by s...

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Abstract

The invention discloses an EPS (expandable polystyrene) improved soil for treating expansive soil slopes and a construction method thereof. The EPS improved soil is prepared by the following step: uniformly stirring 2-4 wt% of polystyrene foam particles, 8-16 wt% of cement and water and 60-80 wt% of excavated expansive soil to form the mixed soil. The EPS improved expansive soil has the advantages of low density, high strength, small swelling-shrinkage deformation, short construction period and the like, can use local materials, can utilize wastes, can effectively solve the problem of destabilization of the expansive soil slopes, and can be widely used in the fields of civil engineering, hydraulic engineering, traffic engineering and the like.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, in particular to an EPS improved soil for treating expansive soil slopes and a construction method. Background technique [0002] Expansive soil contains strong hydrophilic minerals such as montmorillonite and illite, which will swell and soften when exposed to water, shrink and crack when dehydrated, and have developed cracks and extremely unstable properties. It is known as "hidden disaster" and "difficult to deal with". Soil". Expansive soil is widely distributed in my country, covering the southwest, northwest, and southeast coastal areas. Its periodic expansion and contraction deformation characteristics have a serious impact on engineering construction, especially the expansive soil slope is extremely unstable. cause huge economic losses. [0003] Because the failure mechanism of expansive soil slopes is different from that of general soil slopes, the treatment measures fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00E02D17/20E02D3/12
CPCE02D3/12E02D17/20C04B28/00C04B2111/00732C04B14/12C04B16/08
Inventor 高洪梅沈艳青王志华胡颖王超
Owner NANJING UNIV OF TECH
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