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Testing apparatus used for measuring repeated expansion and shrinkage of soil sample and use method thereof

A test device, expansion and contraction technology, used in measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., to achieve the effects of accurate temperature control, simple manufacturing, and high measurement accuracy

Inactive Publication Date: 2010-08-18
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The object of the present invention is to provide a test device for measuring the repeated expansion and contraction of soil samples and its use method, to solve the problem of measuring the vertical displacement and volumetric deformation of the soil when it repeatedly expands or shrinks, and is especially suitable for soil samples. Expansion and contraction measurement problems in the process of solid freezing expansion and melting contraction

Method used

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  • Testing apparatus used for measuring repeated expansion and shrinkage of soil sample and use method thereof
  • Testing apparatus used for measuring repeated expansion and shrinkage of soil sample and use method thereof
  • Testing apparatus used for measuring repeated expansion and shrinkage of soil sample and use method thereof

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Embodiment

[0011] Embodiment: the method of use of the test device for measuring the repeated expansion and contraction of soil samples is as follows:

[0012] (1) The method of free expansion and contraction measurement of sample deformation:

[0013] ① Install the sample: first put the permeable stone 12 into the sample box 19, then put the sample 20, then put the permeable stone 12, cover the top with the top cap 11, and put the vertical displacement meter 9 on the top cap 11 , and reset the reading to zero, and place the loading frame 8 suspended in the air;

[0014] ②Freeze the sample: Start the compressor 16 to make the refrigerant 13 pass through the condenser 15 and enter the evaporator 14 to freeze and cool the sample 20, and control the temperature of the sample 20 through the thermometer 7. When the temperature reaches the test requirements, close the Compressor 16, through the measurement of vertical displacement meter 9, can draw the free freezing expansion of sample 20 und...

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Abstract

The invention relates to a testing apparatus used for measuring the repeated expansion and shrinkage of a soil sample and a use method thereof. The device comprises a heating water tank 1, a loading frame 8, an evaporator 14, a freeze and thaw collapse chamber 17, a sample box 19, a weight 24, a pressurization lever 28 and the like. The testing apparatus has simple manufacture, high measurement precision and accurate temperature control, satisfies the requirements of freeze and thaw collapse of the soil sample and can be used for measuring the expansion and shrinkage amount and the volume change of various frozen and thaw collapsed soil textures in civil engineering. The testing apparatus is not only suitable for measuring under a pressure free expansion and shrinkage environment without load but also is suitable for measuring under a confining pressure environment with vertical load.

Description

technical field [0001] The invention relates to a geotechnical testing instrument, which belongs to the technical field of civil engineering (geotechnical) engineering. Background technique [0002] For a long time, frost heaving and thawing settlement have been one of the main causes of freezing damage in engineering projects in the Northwest cold region. The cycle of frost heaving and thawing of the soil changes the soil structure, destroys the connection force between particles, and rearranges the soil particles, which is one of the important reasons for the deterioration of soil properties, especially for the soil in cold regions. This is especially true for soils with strong structures such as permafrost and loess. Soil structures such as earth dams, dikes, roadbeds, and slopes, under the influence of long-term frost heaving and thawing cycle factors, have caused disasters such as cracks, leakage, and landslides, which have seriously affected the normal construction an...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/18
Inventor 李志清胡瑞林江东辉
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
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