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Automatic loading and unloading hydraulic plane strain test device

A plane strain and testing device technology, applied in measuring devices, using stable tension/pressure to test the strength of materials, instruments, etc., can solve the problems that the main stress adjustment depends on manual labor and the accuracy is difficult to ensure

Pending Publication Date: 2020-10-23
XIAN TECHNOLOGICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an automatic loading and unloading hydraulic type plane strain test device to solve the problem that the adjustment of the main stress in the existing strain test device depends on manual work and the accuracy is difficult to guarantee

Method used

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  • Automatic loading and unloading hydraulic plane strain test device
  • Automatic loading and unloading hydraulic plane strain test device
  • Automatic loading and unloading hydraulic plane strain test device

Examples

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Embodiment

[0044] Put the soil to be tested into the plane stress strain chamber surrounded by the baffle 4 and the hydraulic bladder 8, open a hole in the center of the two symmetrical baffles 4 and insert a steel string type earth pressure cell 6 in each. After the sample is installed, in the pressure chamber 3 in the plane strain direction, the hydraulic ultra-thin jack 5 is rotated and fixed on the pressure chamber through the M10 loading bolt 7 with a length of 40mm, and two pairs of concave smooth rigid baffles 4 are placed vertically. And the two wings of the jack 5 are embedded in the groove on the back of the smooth rigid baffle plate 4 to fix the hydraulic ultra-thin jack 5. The method of applying confining pressure in the direction of the small principal stress is consistent with the operation of the existing true triaxial instrument; cover the top cover of the pressure chamber 2. Push the hydraulic ultra-thin jack 5 to elongate through computer operation, so that the smooth ri...

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Abstract

The invention discloses an automatic loading and unloading hydraulic plane strain test device and a test method thereof, and solves problems that intermediate principal stress adjustment in an existing strain test device depends on manpower and precision is difficult to guarantee. The test device comprises a pressure chamber which is provided with an internal cavity, a plane strain pressure chamber positioned in the internal cavity of the pressure chamber, two jacks and at least two soil pressure boxes, wherein the plane strain pressure chamber is also internally provided with a cavity, is used for placing a soil sample to be measured, and includes two hydraulic bags and two baffle plates; the bottom of each jack is fixed to the pressure chamber, and a telescopic end of each jack is connected to the baffle plate and used for driving the baffle plate to move in a reciprocating mode so that loading or unloading of a principal stress in the soil sample to be measured is achieved; and theat least two soil pressure boxes are embedded on the inner walls of the two baffle plates and are used for acquiring the intermediate principal stress data of the soil sample to be measured.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering testing equipment, and in particular relates to an automatic loading and unloading hydraulic type plane strain testing device. Background technique [0002] Many engineering problems in actual engineering (such as deep foundation pits, retaining walls, high-fill embankments, dams, tunnels, etc.) are in or approximately in a state of plane strain. The strength parameters of soil are generally determined according to the results of conventional triaxial or direct shear tests, without considering the constraints of the principal stress direction and the contribution of stress changes to soil strength under the condition of plane strain stress path. Therefore, determining the strength parameters of the soil based on the plane strain test can give full play to the strength of the soil, improve the economic efficiency of the project, and be more consistent with the stress-strain state o...

Claims

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Application Information

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IPC IPC(8): G01N3/12G01N3/02
CPCG01N3/02G01N3/12
Inventor 张玉杨倩何晖李宝平刘瑾孟天一赵阳
Owner XIAN TECHNOLOGICAL UNIV
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