Planar and lateral strain controlled triaxial apparatus

A lateral strain, plane strain technique used in the application of stable tension/compression to test material strength and other directions

Inactive Publication Date: 2010-04-28
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no special measuring instrument for soil pressure stress relaxation of retaining structures (relaxation of soil shear stress and increase of earth pressure of retaining structures). The main technical difficulties are: it is difficult to satisfy the plane strain condition and the lateral unloading Then maintain a constant strain condition in the unloading direction to implement lateral restraint stress relaxation experiments and measurements

Method used

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  • Planar and lateral strain controlled triaxial apparatus
  • Planar and lateral strain controlled triaxial apparatus
  • Planar and lateral strain controlled triaxial apparatus

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Embodiment Construction

[0024] Such as figure 1 and figure 2 As shown, the plane strain lateral strain control type triaxial instrument in this embodiment includes a base 1, and a trolley 2 is arranged on the base 1, and the trolley 2 is composed of a bottom plate 2-1 and the above-mentioned bottom plate 2-1. It consists of a vertical first side plate 2-2 and a second side plate 2-3, and the first side plate 2-2 and the second side plate 2-3 are parallel to each other. The above-mentioned dolly 2 is rollingly connected with the base 1 . Preferably, two parallel inverted bowl-shaped guide grooves 2-1-1 are provided on the lower side of the bottom plate 2-1 of the trolley 2, and two inverted bowl-shaped guide grooves 2-1-1 are provided on the upper side of the base 1. Two bowl-shaped guide grooves 1-1 corresponding to the groove 2-1-1 are arranged between each inverted bowl-shaped guide groove 2-1-1 and the corresponding bowl-shaped guide groove 1-1 Ball 3.

[0025] A first lateral plug 4 , a seco...

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Abstract

The invention discloses a planar and lateral strain controlled triaxial apparatus. The triaxial apparatus can perform a lateral unloading test or a lateral confined stress relaxation test for a soil sample under a planar strain condition and acquire precise test data. A trolley of the triaxial apparatus comprises a bottom plate and first and second lateral plates which are parallel with each other and vertical to the bottom plate. The trolley is in rolling connection with a chassis; a first lateral plug, a second lateral plug and a lateral baffle are in rolling connection with the chassis of the trolley respectively and form a soil sample accommodating chamber together with the second lateral plate; a first pressure sensor is contacted with the outer side face of the first lateral plug; two ends of a first rotary screw are contacted with the second lateral plug and a first dial indicator respectively; a second pressure sensor is connected with the later baffle and is contacted with the first later plate; a cover plate is arranged on the top of the soil sample accommodating chamber; and a second dial indicator is contacted with the upper side face of the cover plate.

Description

technical field [0001] The invention relates to a measuring instrument for a soil sample lateral unloading experiment or a plane strain lateral restricted stress relaxation experiment under plane strain conditions, in particular to a plane strain lateral strain control type triaxial instrument. Background technique [0002] The lateral unloading of soil samples under plane strain is a problem often encountered in engineering, and the measuring instruments currently used are difficult to strictly meet the conditions of lateral unloading tests. In addition, the laterally confined stress relaxation of soil samples under plane strain conditions is a major topic in the field of geotechnical engineering, such as the stress relaxation problem of the ultimate earth pressure on various retaining structures when the structural displacement is constant, caverns, etc. Soil stress relaxation problems on underground structures, etc. At present, there is no special measuring instrument fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
Inventor 李守德孙飞王保田张福海张文慧张海霞林如
Owner HOHAI UNIV
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