Improved expansive soil as well as preparation method, construction method and application thereof

A construction method, expansive soil technology, applied in soil protection, infrastructure engineering, roads, etc.

Pending Publication Date: 2022-03-01
NANJING UNIV OF INFORMATION SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the present invention provides an improved expansive soil and its preparation method, construction method and application, which can effectively solve the problem of subgrade damage caused by expansion and contraction deformation of expansive soil and improve the strength of expansive soil, which is easy to popularize

Method used

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  • Improved expansive soil as well as preparation method, construction method and application thereof
  • Improved expansive soil as well as preparation method, construction method and application thereof
  • Improved expansive soil as well as preparation method, construction method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The improved expansive soil of preparation 2kg, the preparation method of improved expansive soil is as follows:

[0028] (1) take by weighing 1.82kg of expansive soil according to the proportioning ratio of 91%, take by weighing silica fume 0.16kg according to the proportioning ratio of 8%, take by weighing 5 to 20 microns in diameter according to the proportioning proportion of 1%. 20g of flax fiber with a length of 5-6 cm;

[0029] (2) After the expansive soil and silica fume are evenly mixed, according to the "Highway Soil Test Regulations" JTG E40-2007 medium-heavy compaction test, the optimal water content is 25.1%, that is, add 0.502kg of water and stir evenly;

[0030] (3) adding mass percentage is that flax fiber is mixed in expansive soil in step, makes it evenly mix;

[0031] (4) After 2-3 days of stuffing under natural conditions, the improved expansive soil can be obtained.

[0032] Among them, the analysis results of silica fume are, in terms of the mass...

Embodiment 2

[0045] The improved expansive soil of preparation 2kg, the preparation method of improved expansive soil is as follows:

[0046] (1) Take by weighing 1.79kg of expansive soil according to the proportioning ratio of 89.5%, take by weighing 0.18kg of silica fume according to the proportioning ratio of 9%, and weigh 5 to 20 microns in diameter according to the proportioning proportion of 1.5%. 30g of flax fiber with a length of 7-8 cm;

[0047] (2) After the expansive soil and silica fume are mixed evenly, according to the "Highway Geotechnical Test Regulations" JTG E40-2007 medium and heavy compaction test, the optimal water content is 26%, that is, add 0.52kg of water and stir evenly;

[0048] (3) adding mass percentage is that flax fiber is mixed in expansive soil in step, makes it evenly mix;

[0049] (4) After 2-3 days of stuffing under natural conditions, the improved expansive soil can be obtained.

[0050] Among them, the analysis results of silica fume are, in terms of...

Embodiment 3

[0060] The improved expansive soil of preparation 2kg, the preparation method of improved expansive soil is as follows:

[0061] (1) take by weighing 1.76kg of expansive soil according to the proportioning ratio of 88%, take by weighing 0.2kg of silica fume according to the proportioning ratio of 10%, and weigh 5-20 microns in diameter according to the proportioning proportion of 1%. 40g of flax fiber with a length of 9-10 cm;

[0062] (2) After the expansive soil and silica fume are evenly mixed, according to the "Highway Soil Test Regulations" JTG E40-2007 medium-heavy compaction test, the optimal water content is 26.5%, that is, add 0.53kg of water and stir evenly;

[0063] (3) adding mass percentage is that flax fiber is mixed in expansive soil in step, makes it evenly mix;

[0064] (4) After 2-3 days of stuffing under natural conditions, the improved expansive soil can be obtained.

[0065] Among them, the analysis results of silica fume are, in terms of the mass percen...

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Abstract

The invention relates to improved expansive soil and a preparation method, a construction method and application thereof.The improved expansive soil comprises, by mass, 8%-10% of silica fume, 1%-2% of linen fiber and 88%-91% of expansive soil of a soil body needing to be improved, and the improved expansive soil is formed by evenly mixing the silica fume, the linen fiber and the expansive soil. According to the invention, the expansive soil is improved by using the by-product silica fume in large-scale industrial smelting and the natural material linen fiber, so that the engineering cost is saved, and a new improvement method is developed for reducing engineering disasters caused by the expansive soil in combination with the application of the natural material linen fiber. In the improvement process, the linen fibers give full play to the advantage of softness, the fiber reinforcement effect, the reinforcement-soil interface interaction effect and the fiber caking effect are exerted in an embedded, bent and interwoven mode, creep deformation of the soil body in the deformation process is reduced, the strength of the expansive soil can be remarkably improved, meanwhile, the expansion and shrinkage performance of the expansive soil is reduced, and the expansive soil has the good application prospect. And the damage caused by expansion and shrinkage deformation is reduced.

Description

technical field [0001] The invention belongs to the technical field of foundations, and in particular relates to an improved expansive soil and its preparation method, construction method and application. Background technique [0002] The wide distribution of expansive soils poses a huge challenge to geotechnical engineering. Because it contains a large amount of minerals such as montmorillonite, the volume and strength characteristics of expansive soils will change greatly due to changes in water content, and its instability will It will destroy the integrity of the engineering structure, such as road cracking, uneven foundation settlement, etc., which may cause great economic losses. In order to solve the problem of poor engineering properties of expansive soil, it is necessary to improve the strength and deformation characteristics of expansive soil. The improvement methods of expansive soil mainly include physical method (fiber mixing or weathered sand), chemical method...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/00E02D3/12E01C3/04
CPCE02D3/005E02D3/123E01C3/04E02D2300/0042E02D2300/0043
Inventor 黄曼捷孙树林李思远姜保罗
Owner NANJING UNIV OF INFORMATION SCI & TECH
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