Method for measuring freeze thawing deformation of one-dimensional lateral limit loaded soil sample
A freeze-thaw, soil sample technology, applied in the direction of applying stable tension/pressure to test the strength of materials, to achieve accurate temperature control, high measurement accuracy, and simple manufacturing
Inactive Publication Date: 2011-08-17
INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI
View PDF5 Cites 8 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0003] The purpose of the present invention is to provide a test method for measuring the repeated expansion and contraction of soil samples, which solves the measurement problem of the vertical displacement and volumetric deformation of the soil when it repeatedly expands or shrinks, and is especially suitable for the freezing and expansion of the soil. Expansion and shrinkage measurement problems in the process of melting and shrinking
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment
[0011] Embodiment: The test method for measuring the repeated expansion and contraction of soil samples under the condition of one-dimensional confining stress is as follows:
[0012] 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, add a top cap 11 on the top, align the pressurized shaft 10 with the top cap 11, and place the The weight 24 is placed under the second metal hook 26, and the pressurized shaft 10 is aligned with the top cap 11 by loading the frame 8 to apply a specified pressure to the sample 20, and the vertical displacement gauge 9 is placed on the top cap 11, so that The reading returns to zero;
[0013] 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 req...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method for measuring freeze thawing deformation of a one-dimensional lateral limit loaded soil sample by using a testing device. The device comprises a heating water tank 1, a loading framework 8, an evaporator 14, a freeze thawing chamber 17, a sample box 19, a weight 24 and a pressing lever 28. The heating water tank 1 is connected with freeze thawing chamber 17 through a lower water pipe 5 and an upper water pipe 6, the lower water pipe 5 is controlled by a switching valve 3, and the upper water pipe 6 is controlled by a water pump 2 and a switching valve 4. The device is simple to manufacture, has high measurement precision, meets the freezing and thawing requirements of the soil sample, is accurate to control temperature, and can be used for measuring expansion and shrinkage quantity and volume change of various frozen and thawed soils under a vertical load lateral limit pressure environment in the civil engineering.
Description
technical field [0001] The invention relates to a geotechnical testing method, 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 and sa...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18
Inventor 李志清胡瑞林
Owner INST OF GEOLOGY & GEOPHYSICS CHINESE ACAD OF SCI