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A kind of preparation method of easily redox soil remodeling sample

A technology that is easy to oxidize and soil, which is applied in the preparation of test samples, etc., can solve the problems of expensive instruments, complicated operation, and inability to obtain reshaped soil samples, so as to improve the accuracy of results, increase the speed of soil dehydration, and shorten the production time. The effect of sample period

Inactive Publication Date: 2015-09-02
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The equipment used in this method is expensive and the operation is more complicated
At the same time, none of the above methods isolate the soil sample from the air, cannot avoid the redox process of the soil, and cannot obtain the same remodeled soil sample as the natural state.

Method used

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  • A kind of preparation method of easily redox soil remodeling sample
  • A kind of preparation method of easily redox soil remodeling sample
  • A kind of preparation method of easily redox soil remodeling sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The test object is gray clay in Zhanjiang area, Guangdong Province.

[0025] A kind of preparation method of easy redox soil remodeling sample, its steps are:

[0026] 1) Sample cutting

[0027] Take the soil sample out of the soil sample tube or packing tape, cut off the outer layer of soil with a soil cutting knife, and cut the soil sample into a flat cuboid with a height of 0.5 or 1 or 1.5 or 2 cm. The length and width can be determined according to the desktop freeze dryer. The inner capacity is determined. In this example, the length and width are both 5cm. Put the cut soil samples into the tray. The purpose of tiling is mainly to prevent the adhesion between soil samples, which is not conducive to rapid freezing and affects the dehydration speed of the sublimation drying process.

[0028] 2) vacuuming

[0029] Quickly put the cut soil sample and the tray into the vacuum compression bag, and then use an air pump to pump air after sealing until the vacuum degree...

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Abstract

The invention discloses a preparation method for a reconstituted sample of easily reduced and oxidized soils. The method comprises steps of: 1) cutting the sample; 2) vacuumizing; 3) freezing; 4) sublimation drying; and 5) storing. According to the invention, based on a principle that in frozen state of a soil solution, frozen ice in the soil solution is directly sublimated to be water vapor for discharge via vacuumizing to reduce pressure, thereby the soil is enabled to dry. The method is feasible, and simple in operation, and the entire sample preparation process is a vacuum state, thus preventing the impact of redox reactions on soil properties; and soil samples obtained can be used for tests of soil mechanics, physical properties, and soil properties, with significantly improved test results accuracy. The process of vacuumizing to reduce pressure improves the soil dehydration speed, greatly reducing the sample preparation cycle.

Description

technical field [0001] The invention relates to the technical field of soil dry sample preparation, in particular to a method for preparing a soil remodeling sample easily oxidized and reduced. Background technique [0002] Many chemical and biochemical reactions in soil have redox characteristics. Redox reaction is a common phenomenon in soil (especially soil solution). Under this influence, soil properties will change. For example, gray clay in Zhanjiang area of ​​Guangdong Province and London clay are gray when they are fresh, and quickly oxidize to yellowish brown after contacting with the atmosphere. After several months of storage, brown or reddish brown iron nodules will form on the soil surface. The structural state and physical and mechanical properties all change (see literature: Luo Hongxi, Chen Shouyi, Engineering Geological Properties of Zhanjiang Gray Clay, Hydrogeology and Engineering Geology, 1985 (1): 1-5; R.J.Chandler, Clay sediments in depositional basin: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/28
Inventor 张先伟孔令伟杨爱武
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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