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Preparation method for icerich frozen soil sample

A technology for sample preparation and frozen soil, which is applied in the field of sample preparation for studying the mechanical properties of high-ice-containing soil, can solve the problems of sample inhomogeneity, failure to operate normally, and unsuitability for high-ice-containing samples, etc., and achieve low cost and high test efficiency. The result is accurate and the process is simple

Inactive Publication Date: 2011-11-02
NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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Problems solved by technology

When the layered compaction method is used to prepare samples with high ice content, the last layer of soil itself often freezes, and it is not easy to bond with other layers uniformly, which will eventually lead to great heterogeneity of the sample; the consolidation method It is to make air-dried soil and distilled water into a thin slurry larger than the liquid limit, pour it into the sample preparation cylinder, and apply a static load on the top to accelerate the consolidation of the soil sample to obtain a saturated sample, which is obviously not suitable for the preparation of samples with high ice content; Suitable for normal temperature, will not work well at low temperature

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  • Preparation method for icerich frozen soil sample
  • Preparation method for icerich frozen soil sample
  • Preparation method for icerich frozen soil sample

Examples

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example 1

[0022] Example 1 prepares 3 cylindrical Qinghai-Tibet plateau silty sand samples, its height is 125.0mm, diameter 61.8mm, dry density 0.44g / cm 3 , Moisture content is 150.0%.

[0023] Sample preparation preparation: first open the low-temperature laboratory (temperature control accuracy ±1.0°C), set its temperature to -7°C (too low temperature, the mixture of ice, soil, and water is prone to rapid freezing; unfavorable for the presence of ice). After the temperature reaches the set value and stabilizes for at least 2 hours, place the dry silty sand with a particle size of ≤2.0mm and all the tools involved in the preparation of the sample in a low-temperature laboratory for at least 12 hours at a constant temperature. Add 4000g of distilled water to the ice tray and place it in a low-temperature laboratory for at least 12 hours of freezing. The thickness of the ice is ≤20.0mm, which is convenient for breaking.

[0024] Sample preparation process of high ice silty sandy soil: ...

example 2

[0040] Example 2 prepares 3 cylindrical Qinghai-Tibet plateau silty clay samples, its height is 125.0mm, diameter 61.8mm, dry density 0.79g / cm 3 , Moisture content is 70.0%.

[0041] Sample preparation preparation: first open the low temperature laboratory (temperature control accuracy ±1.0°C), and set its temperature to -7°C. After the temperature reaches the set value and is stable for at least 2 hours, put the dry powder clay with a particle size of ≤2.0mm and the tools involved in the preparation of the sample in a low temperature laboratory for at least 12 hours at a constant temperature, and at the same time put it in a stainless steel ice tray Add 4000g of distilled water and place in a cryogenic laboratory for at least 12h of freezing.

[0042] High ice powdery clay sample preparation process:

[0043] (1) Calculate the mass of dry soil, ice and water needed to prepare a clay sample: according to the given sample moisture content of 70.0%, dry density of 0.79g / cm 3 ...

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Abstract

The invention discloses a preparation method for an icerich frozen soil sample. The method comprises the steps of establishing a low temperature laboratory and preparing dry soil at a constant temperature and ice samples. The specific flow of the method comprises: 1) calculating the weight of dry soil, ice and water needed for the preparation of a sample; 2) crushing ice; 3) mixing ice and dry soil uniformly; 4) preparing a mixture of ice and water; 5) uniformly mixing ice, dry soil and water; 6) carrying out compacting to obtain a sample; 7) freezing the sample; 8) determining a part of parameters of the sample. According to the invention, no professional equipment is needed; the process is simple and flexible; the cost is low; results of the test are accurate and artificial icerich frozen soil samples can be prepared according to actual desired dimension, thereby guaranteeing sample supply for tests and research on icerich frozen soil.

Description

technical field [0001] The invention relates to a sample preparation method for studying the mechanical properties of high-frozen soil. It is suitable for low-temperature laboratories to prepare high-icy artificial frozen soil samples with a monolithic structure (the maximum particle size of soil or ice particles does not exceed 2.0mm). Background technique [0002] Highly frozen soil refers to the soil whose water content exceeds the saturated water content and the temperature is lower than 0 °C. The high ice content (volume ice content ≥ 20%) section of the permafrost that the Qinghai-Tibet Highway crosses accounts for 59% of the total length; the Qinghai-Tibet Railway passes through the permafrost area for 632 km, of which 221 km is the high ice content permafrost area. The overlapping road section of high temperature and high ice content permafrost is 134km. In China, a large number of indoor studies have focused on frozen soils with low ice content, that is, frozen so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28
Inventor 张淑娟马巍赖远明杜玉霞
Owner NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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