Tester for soil vertical and radial expansive deformation and expansive force relation

A technology of deformation testing and radial expansion, which is applied in soil testing, instruments, measuring devices, etc., can solve the problems of inaccuracy, long data processing time period, and the inability to consider the measurement of expansion force and expansion volume, etc.

Inactive Publication Date: 2012-08-15
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing technical solution has the following disadvantages: it can only test the vertical expansion force and expansion deformation under confinement conditions
Unable to consider the measurement of expansion force ...

Method used

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  • Tester for soil vertical and radial expansive deformation and expansive force relation
  • Tester for soil vertical and radial expansive deformation and expansive force relation
  • Tester for soil vertical and radial expansive deformation and expansive force relation

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The invention provides a tester for testing soil vertical and radial expansion force and expansion deformation, the tester includes a friction reducing device ( figure 2 ), sample retaining ring parts ( image 3 ), confining pressure and radial deformation test parts ( image 3 ), vertical pressure and deformation test parts, data acquisition instrument; the friction reducing device is located in the immersion tank, and the sample retaining ring part is placed on the friction reducing device in the center of the immersion tank, through the extension of the confining pressure outer ring block assembly 13 The rod 32 is connected with the confining pressure and radial deformation test components; the data acquisition instrument is located outside and connected with each sensor through the data line; the data acquisition instrument is connected with the computer through the data line.

[0025] The friction reducing device, also known as the "floating" device, can effectiv...

Embodiment 2

[0044] Embodiment 2 This instrument usage method:

[0045] 1. Preparation of soil samples

[0046] The soil sample was passed through a 2mm sieve, mixed with soil according to the predetermined moisture content, mixed evenly, and stuffed with a plastic bag for a day and night.

[0047] Tighten the special test ring blade 28 (four small petals together) with No. 1 ring hoop 29, screw on the small bolt 30 of the ring hoop, apply Vaseline inside and weigh the mass m 0 .

[0048] Put the assembled test ring blade 28 into the static pressing sample cylinder, weigh a certain amount of prepared soil sample, add the same amount into the cylinder in three equal amounts, use a knife to gently insert it and smooth the surface, and gently vibrate the test cylinder A few strokes to make the soil sample slightly compact. Smooth the compaction cylinder, go to the base of the CBR compaction instrument, adjust the CBR pointer to zero, and electrically adjust the CBR knob (down first, then u...

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PUM

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Abstract

The invention discloses a tester for testing soil vertical and radial expansive force and expansive deformation. The tester comprises a frication force reducing device, a sample protecting ring component, a confining pressure and radial deformation testing component, a vertical pressure and deformation testing component and a data acquirer. The friction force reducing device is located in a soaking tank; the sample protecting ring component is placed on the friction force reducing device at the center of the soaking tank; and the data acquirer is connected with sensors in the vertical pressure and deformation testing component and the confining pressure and radial deformation testing component via data lines, and transmits acquired data to a computer. The tester can be used for testing vertical and radial expansive forces in a sample saturation process when vertical and radial displacements are not changed and obtaining the change law of the vertical and radial expansive forces, testing vertical and radial expansive forces under the condition of different vertical displacements in the sample saturation process when the radial displacement is changed or not changed, and the like.

Description

technical field [0001] The invention relates to a tester for the relationship between soil vertical and radial expansion deformation and expansion force. Background technique [0002] The expansive soil behind the wall is limited in water absorption and expansion, and is often damaged due to excessive expansion force, resulting in huge economic losses. However, the use of geogrid-reinforced flexible support is very effective, mainly because the flexible support allows the expansive soil to absorb water and expand. The expansion force is greatly reduced. How to determine the variation law of expansive soil's vertical and radial expansion force and the presence or absence of vertical and radial deformation is particularly important. The expansion force test and expansion rate test of my country's latest road geotechnical test regulations (JTG E40-2007) are all tested by uniaxial consolidation instrument, which can only measure the expansion force and expansion rate of the sam...

Claims

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Application Information

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IPC IPC(8): G01N19/00G01N33/24
Inventor 杨和平肖杰李艳艳唐咸远刘艳强李晗峰
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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