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Loess engineering property modification method

A technology of engineering properties and loess, which is applied in the field of engineering properties modification of loess, can solve the problems of other materials that are less studied, and achieve the effects of reducing water sensitivity, reducing collapsibility, and improving strength

Inactive Publication Date: 2015-02-18
NORTHWEST UNIV
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Problems solved by technology

At present, the materials used to modify loess are mostly concentrated on industrial building materials such as cement and lime, and there are few studies on other materials.

Method used

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Examples

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Embodiment 1

[0026] Example 1: Modification method of engineering properties of loess:

[0027] The construction method of cement kiln dust modified loess comprises the following steps:

[0028] (1), loess and cement kiln dust are carried out air-drying, cross 2mm sieve;

[0029] (2), the loess and cement kiln dust after step (1) air-dried and sieved are mixed evenly in the ratio of dry mass 91:9;

[0030] (3), carry out standard compaction test to mixture, obtain the optimum moisture content of mixture 17% and maximum dry density 1.70g / cm 3 ;

[0031] (4), mix the mixture of step (2) with water according to the optimal moisture content of 17%, and compact it into a dry density of 1.70g / cm after mixing evenly 3 The mixed soil samples were used for curing, and the curing period was 28 days to complete the loess modification treatment.

[0032] The hammer weight used in the standard compaction test in step (3) is 2.5kg, and the hammer bottom area is 19.64cm 2 , the drop distance is 30...

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Abstract

The invention provides a loess engineering property modification method and belongs to the technical field of soil modification on the basis of adding modified materials into soil. The method comprises the following steps: (1), airing loess and cement flue dust raw materials and sieving with a 2mm sieve; (2) uniformly mixing the sieved loess and cement flue dust at a dry mass ratio of 91:9; (3) carrying out a standard compaction test on a mixture obtained in the step (2), thereby obtaining a mixture with the optimal water content ratio and maximum dry density; (4), mixing the mixture obtained in the step (2) and water at an optimal water content ratio, compacting to obtain a mixed soil sample with the dry density value as maximum dry density after mixing uniformly, and curing the mixed soil sample for 28 days, thereby finishing loess modification treatment. The method has the advantages of treating loess by use of industrial waste cement flue dust, lowering the cost, saving resources, protecting the environment, improving the loess strength and lowering the water sensitivity.

Description

technical field [0001] The invention belongs to the technical field of adding modified materials to soil to improve soil, and relates to a method for modifying engineering properties of loess. Background technique [0002] Loess, formed in arid and semi-arid climate conditions, is a special Quaternary continental loose deposit, rich in calcium, carbonate and soluble salts, with vertical joints, macroporosity, and soft soil. Due to the special material composition and structural characteristics of loess, it has special engineering geological properties, such as water sensitivity including disintegration and collapsibility. Therefore, engineering construction in the loess area often has more engineering diseases. Such as the uneven settlement of embankments, the collapse of tunnels in high-humidity loess, and the deformation and damage caused by the negative friction of pile genes, etc., pose a great threat to the construction and operation of engineering construction. There...

Claims

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Application Information

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IPC IPC(8): A01B77/00
Inventor 崔素丽司冬冬
Owner NORTHWEST UNIV
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