Frozen soil freezing and thawing cycle SHPB test equipment under stress state and test method thereof

A freeze-thaw cycle and stress state technology, which is used in the preparation of test samples, the use of a single impact force to test the strength of materials, and the use of stable tension/pressure to test the strength of materials, etc. question

Pending Publication Date: 2019-03-19
CHONGQING JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, the SHPB test of the freeze-thaw cycle under the state of soil stress has not been realized

Method used

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  • Frozen soil freezing and thawing cycle SHPB test equipment under stress state and test method thereof
  • Frozen soil freezing and thawing cycle SHPB test equipment under stress state and test method thereof
  • Frozen soil freezing and thawing cycle SHPB test equipment under stress state and test method thereof

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Experimental program
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Embodiment 1

[0036] see figure 1 , the present embodiment discloses freeze-thaw cycle SHPB test equipment for frozen soil under stress state, including freeze-thaw cycle sample preparation system, SHPB test system and data acquisition system.

[0037] see figure 2 , the freeze-thaw cycle sample preparation system includes a freeze-thaw cycler 1 , a freeze-thaw box 4 and a soil placement frame 5 . The freeze-thaw box 4 is a rectangular box with a top cover. The four side walls of the rectangular box are sequentially the first side wall, the second side wall, the third side wall and the fourth side wall. A liquid nitrogen cooling chamber 401 is enclosed in the first side wall and the third side wall. Both the first side wall and the third side wall are provided with a liquid nitrogen injection port 403 and a liquid nitrogen output port 404 . The liquid nitrogen injection port 403 and the liquid nitrogen output port 404 communicate with the outside of the freeze-thaw box 4 and the liquid...

Embodiment 2

[0042] A kind of test method about permafrost freeze-thaw cycle SHPB test equipment under the stress state described in embodiment 1, comprises the following steps:

[0043] 1) According to the test requirements, mix the soil material according to a certain gradation and density, add a certain amount of water and stir thoroughly, and seal it for 12 hours to make the soil particles and water evenly mixed.

[0044] 2) Apply a layer of butter on the inner wall of the soil storage chamber S, so as to make the soil particles and the inner wall contact and lubricate.

[0045] 3) Divide the soil materials into three equal parts into the soil placement chamber S, compact them in layers, and ensure that the bottom layer of soil is planed before compacting each layer of soil to ensure good contact between soil layers . Wherein, a temperature sensor is installed in the soil storage chamber S.

[0046] 4) Turn on the freeze-thaw cycler 1 to realize the freeze-thaw cycle of the soil, and...

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Abstract

The invention provides frozen soil freezing and thawing cycle SHPB test equipment under stress state and a test method thereof. The test equipment comprises a freezing and thawing cycle sample preparation system, a SHPB test system, and a data acquisition system. The soil is placed in a soil placement chamber S; the freezing and thawing cycle of the soil body is realized by the freezing and thawing cycle instrument; and the soil body is made into a cylindrical test piece. The test piece is placed in a pressure chamber. A stress-loading control system is used for injecting non-frozen liquid into the pressure chamber to apply a confining stress to the test piece. A bullet is emitted by bullet launching device to strike an incident rod, and generates an incident compression wave in the incident rod. The incident compression wave is transmitted to the test piece, and a part of the wave enters a transmission rod to become a transmitted wave. The test method of the test equipment comprises the steps of preparing the test piece, applying the confining stress, testing and the like. The test equipment can be used for observing the mesoscopic characteristics of the test sample during the test. The freezing and thawing cycle of soil body and the automation of frozen soil simulation under stress state can be realized. The frozen soil SHPB test under triaxial loading can be effectively realized.

Description

technical field [0001] The invention relates to the technical field of frozen soil mechanical behavior, in particular to frozen soil freeze-thaw cycle SHPB test equipment. Background technique [0002] Frozen soil refers to various rocks and soils with a temperature at or below 0°C and contains ice. It is extremely sensitive to temperature and contains abundant underground ice. Therefore, permafrost has rheological properties, and its long-term strength is much lower than the instantaneous strength characteristics. Because of these characteristics, construction of engineering structures in permafrost must face two major dangers: frost heaving and thawing. What plays an important role is the existence form of water. When the water turns into ice, the volume increases, which makes the soil expand, and the surface of the earth is arched and raised, which is frost heaving; when the ice in the soil turns into water, the volume increases. When it shrinks, the surface will melt a...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/42G01N3/30G01N3/10G01N3/02
CPCG01N1/28G01N1/286G01N1/42G01N3/02G01N3/10G01N3/30G01N2203/001G01N2203/0019G01N2203/0228
Inventor 邱珍锋周永峰杨少博王俊杰
Owner CHONGQING JIAOTONG UNIVERSITY
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