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Spraying method of secondary solution for improving expansive soil

A technology of expansive soil and spraying method, applied in the field of geotechnical engineering, to achieve the effect of improving compressive strength, meeting engineering requirements, and inhibiting adsorption

Inactive Publication Date: 2012-06-27
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the expansive soil treatment process, reduce costs, meet the construction period requirements, and avoid environmental problems caused by a large amount of filling and spoil

Method used

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  • Spraying method of secondary solution for improving expansive soil
  • Spraying method of secondary solution for improving expansive soil
  • Spraying method of secondary solution for improving expansive soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Taking expansive soil with wet soil mass m=1000g as an example, the initial moisture content of expansive soil is 20%, and the target moisture content is 26%, then the dry soil mass m s =1000÷(1+20%)=833.3g.

[0016] 1. According to m 1 :m s =3:100, weigh m 1 = 25.0g of industrial water glass (purchased from Nanjing Hengliang Fine Chemical Co., Ltd., with a Baume degree of 0.45 and a modulus of 2.7), the mass of water required m w1 =833.3×(26%-20%)=50.0g, dissolve the water glass in water, spray the prepared water glass solution evenly into the expansive soil, mix well, and let it stand for 2 hours for later use.

[0017] 2. According to m 2 :m s =5:1000, the mass of aluminum sulfate powder (purchased from Jiangsu Qiangsheng Chemical Co., Ltd., chemically pure white powder, particle size unlimited) m 2 =833.3×5÷1000=4.2g, the target water content of this step is 30%, then the mass m of water needed to dissolve aluminum sulfate w2 =833.3×(30%-26%)=33.3g, di...

Embodiment 2

[0020] The improvement effect of the method described in Example 1 of the present invention to expansive soil is shown in Table 1, and the investigation method is to adopt the mode of comparing the free expansion rate of the improved soil with the free expansion rate of the plain soil.

[0021] Table 1 Investigates the improvement effect result table of the method of the present invention on expansive soil with the free expansion rate index

[0022]

[0023] It can be seen from Table 1 that the improvement effect of using water glass alone is not obvious, while the free expansion rate of the improved soil sprayed with the secondary solution is reduced by about 60%, and the expansion of the improved soil has been eliminated, which meets the requirements of engineering use.

[0024] The improved soil treated by spraying the solution twice in Example 1 was adjusted to the optimal water content of 19.8%, compacted according to the 95% compaction degree to make a ring knife sampl...

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Abstract

The invention relates to a spraying method of a secondary solution for improving expansive soil. The spraying method is characterized by comprising the following steps of: (1) dissolving water glass with the mass m1 into water with the mass mw1 to prepare water glass solution, uniformly spraying the water glass solution into dry expansive soil with mass ms, mixing uniformly, standing for 2-12h for later use; and (2) dissolving aluminum sulfate powder with mass m2 into water with mass mw2 to prepare an aluminum sulfate solution, uniformly spraying the aluminum sulfate solution in a standby soil sample obtained in the step (1), mixing uniformly, standing for over 2h, and carrying out compaction treatment when the moisture content is reduced to the optimal moisture content. Compared with the traditional method for improving lime or cement and the like, the spraying method is simple in process and remarkable in effect and meets the requirement for environment friendliness.

Description

Technical field [0001] The present invention involves a chemical improvement method of expansion soil. It can be sprayed into the expansion soil by the water solution of different reagents and mixes evenly.Sexual, and after several times of dry and wet circulation, it still maintains intact structure and higher strength than unwell -improved expansion soil.It belongs to the field of geotechnical engineering technology. Background technique [0002] The expansion soil is a type of special viscosity soil with significant expansion and softening of water absorption, significant expansion and softening, and sharp shrinkage of water loss. It has special properties such as multi -cracking, ultra solidity, disintegration, weathering, and attenuation.Construction, railway, highways, airports, water conservancy projects, etc. often suffer huge damage, causing major economic losses. [0003] The expansion soil cannot be directly used in engineering. The commonly used expansion soil treatme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/40
Inventor 张文慧郑华文王保田王亚坤陈涛张福海李守德
Owner HOHAI UNIV
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