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Temperature-control pressure chamber system for unsaturated soil tri-axial apparatus

A technology of temperature control system and pressure chamber, applied in instruments, using stable tension/pressure to test the strength of materials, scientific instruments, etc., can solve problems such as unsatisfactory and ineffective temperature control, so as to prevent heat loss and ensure Uniformity, Measurement, and Acquisition Automated Effects

Inactive Publication Date: 2011-09-07
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the conventional GDS unsaturated soil triaxial instrument cannot effectively control the temperature during the experiment, and cannot meet the requirements of unsaturated soil experiments considering the influence of temperature

Method used

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  • Temperature-control pressure chamber system for unsaturated soil tri-axial apparatus
  • Temperature-control pressure chamber system for unsaturated soil tri-axial apparatus
  • Temperature-control pressure chamber system for unsaturated soil tri-axial apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the pressure chamber system of the temperature-controlled unsaturated soil triaxial instrument of the present invention includes a loading platform, a pressure cover, and a temperature control system;

[0027] The loading platform includes a bearing platform 14, a lifting platform 15, a base 17, two struts 19, a beam 22 and an axial load sensor 24, a bracket 25 and an axial displacement sensor 26; the lower end of the two struts 19 and the bearing platform 14 Fixed connection, the upper end passes through the two ends of the beam 22 and is fixedly connected by fixing bolts 23; the upper end of the axial load sensor 24 is connected to the midpoint of the beam, and the lower end is in contact with the piston rod 18; the lower end of the axial displacement sensor 26 is connected to the top cover 2 are in contact, the upper end is connected to the piston rod 18 through the bracket 25;

[0028] The pressure cover includes a top cover 2, an outer wall 4 ...

Embodiment 2

[0039] The difference between this embodiment and embodiment 1 is that when the unsaturated soil-soil-water characteristic curve is tested, in order to shorten the test time while ensuring the same accuracy and test results, the axial piston rod 18 and the organic glass sample A height-increasing pad 29 is arranged between the caps 6, so that a sample with a smaller height can be used. The heightening pad 29 is composed of two upper and lower cylinders with different diameters, the top of which is in contact with the axial piston rod 18, and the semicircular groove on the top has the same radius as the semicircular protrusion on the top of the axial piston rod 18. The bottom is in contact with the organic glass sample cap 6, and the diameter of the two is equal.

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Abstract

The invention relates to a temperature-control pressure chamber system for an unsaturated soil tri-axial apparatus, and the system comprises a loading platform and a pressure cover, wherein the pressure cover is fixedly arranged on the loading platform; the pressure chamber system further comprises a temperature control system which is connected to the pressure cover; the pressure cover comprisesa top cover and an outer wall; the outer wall has a sandwich structure; the temperature control system comprises an electric heating plate, a lead, a temperature controller and a temperature sensor; the electric heating plate is arranged in the sandwich layer of the outer wall and is connected to the temperature controller through the lead; the temperature sensor is fixed on the top cover of the pressure cover through a fixing nut; and one end of the temperature sensor is arranged in the pressure cover while the other end is connected to the temperature controller through the lead. The systemis used for realizing the precise control and measurement for the test temperature on the basis of the conventional unsaturated soil tri-axial apparatus and is used for carrying on various unsaturated soil tests at different temperatures, thereby promoting the universality of the ordinary unsaturated soil tri-axial apparatus. Besides, the temperature control is automated and the measured data is accurate.

Description

Technical field [0001] The invention relates to an unsaturated soil triaxial instrument pressure chamber system capable of effectively controlling experimental temperature, and belongs to the technical field of civil engineering geotechnical experimental instruments. Background technique [0002] The existing researches on the basic properties of unsaturated soils are mostly carried out at room temperature, ignoring the influence of temperature. However, the soil in nature is always in a specific natural environment, and its basic properties will vary greatly with the different moisture and temperature conditions. The basic properties of the soil obtained by ignoring the influence of surrounding environmental factors will It is inaccurate and cannot meet the needs of actual engineering. Although due to the development of frozen soil engineering, certain results have been achieved in the study of the influence of low temperature on soil properties, but the research on the effect ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18G01N3/02
Inventor 蔡国庆赵成刚刘艳李舰
Owner BEIJING JIAOTONG UNIV
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