Method for improving swelling soil by using alkali residue and construction method for alkali- residue-modified soil

A technology of expansive soil and alkali slag, which is applied in the fields of soil protection, chemical instruments and methods, fertilization devices, etc., to achieve the effects of protecting the environment, increasing the strength of expansive soil, and improving the gradation

Inactive Publication Date: 2012-02-15
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The purpose of the present invention is to overcome the defects of large amount of cement and lime and poor comprehensive utilization of alkali slag. The present invention provides a method for improving expansive soil with alkali slag and its construction method, which can effectively solve the problem of swelling of expansive soil. Subgrade damage caused by shrinkage deformation and increase the strength of expansive soil, easy to popularize

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare the mixed soil to prepare 1.3kg mixed soil. The process steps of mixed soil preparation are as follows: (1) the dry soil mass of the expansive soil to be improved is 1.0kg, and it is weighed according to the ratio of 30% of the slag mixing rate (the slag mixing rate refers to the ratio of the alkali slag quality to the dry soil quality) The required mass of alkali slag is 0.3kg (2) After mixing evenly, the optimal moisture content obtained from the medium and heavy compaction test of "Highway Soil Test Regulations" (JTJ-051-93) is 18%, and 1.3kg×0.18= 234g of water was added therein, and the mixture was evenly mixed to prevent the formation of pimples to obtain mixed soil.

[0046] The steps of the improved construction method are as follows: After unloading the modified soil with alkali slag to the designated place, spread it evenly with a thickness of 30-35cm; after detecting that the moisture content reaches the optimum moisture content requirement, use a roa...

Embodiment 2

[0058] A method for improving weak expansive soil with alkali slag, the steps are:

[0059] The first step, take alkali slag and expansive soil according to the ratio of 30% by slag mixing rate (slag mixing rate refers to the ratio of alkali slag quality to dry soil quality), and mix evenly; the main chemical composition of the alkali slag is Composition, by mass percentage: CaCO 3 43.6%, CaO 13.6%, SiO 2 8.2%, Al 2 o 3 3.8%, Mg(OH) 2 9.0%;

[0060] The second step is to determine the optimum moisture content of the mixed soil sample through experiments;

[0061] 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. Alkali slag modified soil after alkali slag improvement.

[0062] Using the method for improving expansive soil with alkali slag to ...

Embodiment 3

[0068] A method for improving medium expansive soil with alkali slag, the steps are:

[0069] The first step, take alkali slag and expansive soil by weighing the ratio of 40% by slag mixing rate (slag mixing rate refers to the ratio of alkali slag quality to dry soil quality), and mix evenly; the main chemical composition of described alkali slag Composition, by mass percentage: CaCO 3 43.6%, CaO 13.6%, SiO 2 8.2%, Al 2 o 3 3.8%, Mg(OH) 2 9.0%;

[0070] The second step is to determine the optimum moisture content of the mixed soil sample through experiments;

[0071] 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. Alkali slag modified soil after alkali slag improvement.

[0072] Using the method for improving expansive soil with alkali slag...

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Abstract

The invention discloses a method for improving swelling soil by using alkali residue and a construction method for the alkali residue modified soil. The method for improving the swelling soil by using the alkali residue comprises the following steps of: 1, mixing the alkali residue and the swelling soil uniformly in a mass ratio of the alkali residue to dry soil of 30 to 40 percent to obtain mixed soil; 2, determining the best moisture content of the mixed soil through a heavy compaction test in 'Road Geotechnical Test Regulation' JTJ-051-93; and 3, adjusting the moisture content of the mixed soil obtained in the step 1 to maintain the moisture content to be the best moisture content, mixing uniformly, and enclosing the materials under the natural condition for 5 to 7 days to obtain the alkali residue modified soil. The construction method comprises the following steps of: unloading the alkali residue modified soil after improvement into an appointed place; paving uniformly, wherein the paving thickness is 30 to 35 cm; after detecting that the moisture content meets the best moisture content requirement, statically pressing the soil quickly and leveling accurately by using a road roller; and rolling the road surface to the required compactedness. The improved swelling soil can eliminate expansibility of the swelling soil, improve water stability of the swelling soil and meet strength required by engineering.

Description

technical field [0001] The invention belongs to the technical field of geological disaster treatment and geotechnical engineering, and specifically relates to an improvement and construction method of expansive soil. [0002] Background technique [0003] 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. [0004] (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. [0005] (2) Physical improvement methods include soil nailing wa...

Claims

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Application Information

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