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Flat sample unsaturated soil triaxial test-based volume measurement device and measurement method thereof

A technology of triaxial test and volume measurement, which is applied in the direction of measuring device, permeability/surface area analysis, suspension and porous material analysis, etc. It can solve the problems of inaccuracy and cumbersome process, etc., and achieve accurate reading and high measurement accuracy , Reasonable effect of the device principle

Active Publication Date: 2016-11-02
NANJING UNIV OF TECH
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  • Application Information

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Problems solved by technology

Obviously, the calibration process is cumbersome and not necessarily accurate, so it is necessary to develop a volume measurement device based on a flat sample unsaturated soil triaxial test

Method used

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  • Flat sample unsaturated soil triaxial test-based volume measurement device and measurement method thereof
  • Flat sample unsaturated soil triaxial test-based volume measurement device and measurement method thereof
  • Flat sample unsaturated soil triaxial test-based volume measurement device and measurement method thereof

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Embodiment Construction

[0021] Hereinafter, specific embodiments of the present invention will be described in detail according to the accompanying drawings.

[0022] components such as Figure 1 to Figure 6 The shown device specifically includes that the base 1 of the high air intake value clay plate is a boss-shaped structure, and there is a circular groove on the upper part of which a circular clay plate 10 is built. The base 1 of the high air intake value clay plate has a cylindrical cavity inside. Used to insert the back pressure controller cannula 12. Sample 8 is a self-made finished cylindrical unsaturated soil, which is placed on the clay plate 10, and the diameter of sample 8 is equivalent to that of the clay plate 10. The sample cap 13 is installed on the permeable stone 9 in a cylindrical shape, and its diameter is equivalent to that of the permeable stone 9. There is a round hole on the sample cap 13 for inserting the air pressure controller intubation tube 11 . The rubber film 14 respe...

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Abstract

The invention discloses a flat sample unsaturated soil triaxial test-based volume measurement device and a measurement method thereof. The measurement device comprises a horizontal transverse transparent calibrated scale, a horizontal longitudinal transparent calibrated scale, a vertical transparent calibrated scale, a supporting pole, a horizontal transverse steel needle and a horizontal longitudinal steel needle. The invention has the following advantages: the device and the method are suitable for unsaturated soil; the device is aimed at flat small samples, thickness of which is less than thickness of conventional triaxial samples; soil-water characteristic curve test time is greatly shortened; by ingenious utilization of the physical law that a convex mirror has an amplifying effect, a pressure chamber cover and confining pressure water form a convex mirror, a person watches the orthographic reading of an end of the steel needle projected on the scale, the orthographic projection on the scale is clear for distinguishing, and the reading is accurate; according to the trapezoid median line theory, diameter of a sample is calculated through the reading of the steel needle on the transparent calibrated scale, errors caused by installation of the steel needle are eliminated by the calculation method, and the result is more accurate; and the device has reasonable principle, has high measurement precision and is simple and economical.

Description

technical field [0001] The invention relates to an indoor geotechnical experiment testing device, in particular to a static triaxial instrument for studying unsaturated soil, and belongs to the category of geotechnical engineering testing and unsaturated soil mechanics experiment equipment. Background technique [0002] The soil of "civil engineering" is divided into saturated soil and unsaturated soil, and 90% of land soil belongs to the category of unsaturated soil. In recent years, as national and regional major projects have higher and higher requirements for the study of soil mechanical properties, the conditions of indoor geotechnical experiments are required to be consistent with the actual engineering conditions. It is the general trend to study the mechanical properties of unsaturated soil indoors. Before the 1990s, equipment development technology could not realize unsaturated mechanical testing, but since the 21st century, the international development and promoti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 李彤韩爱民王旭东徐洪钟
Owner NANJING UNIV OF TECH
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