Method for determining shear yield surface and volume yield surface of geotechnical materials

A technology of volume yielding and geotechnical materials, applied in the direction of analyzing materials, using stable shear force to test the strength of materials, measuring devices, etc., can solve problems such as volume yielding

Active Publication Date: 2019-04-05
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Geotechnical materials not only yield in shear but also

Method used

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  • Method for determining shear yield surface and volume yield surface of geotechnical materials
  • Method for determining shear yield surface and volume yield surface of geotechnical materials
  • Method for determining shear yield surface and volume yield surface of geotechnical materials

Examples

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Embodiment 1

[0189] This embodiment is an application example of the assay method of the shear yield surface and the volume yield surface of rock and soil material according to the present invention. At this moment, the triaxial tester can control the average stress to be a constant value, and the Fujian standard sand is used as the test material. It includes the determination steps of the shear yield surface, the determination step of the shear shrinkage part of the volume yield surface and the determination step of the dilatation part of the volume yield surface.

[0190] The steps for determining the shear yield surface are as follows:

[0191] Explanation of the symbols in the following steps: f s is the shear yield function, when f s Shear yielding occurs when ≥0, when f s When s is the relative deviatoric stress, defined by formula (2); H s is the shear hardening parameter; p is the average stress; K s is the shear isotropic hardening coefficient at the actual average stress, def...

Embodiment 2

[0303] This embodiment is another application example of the method for measuring the shear yield surface and volume yield surface of rock and soil materials according to the present invention. At this time, the triaxial tester cannot control the average stress to a constant value, and Fujian standard sand is used as the test material. , including the determination step of the shear yield surface, the determination step of the shear shrinkage part of the volume yield surface and the determination step of the dilation part of the volume yield surface.

[0304] The steps of determining the shear yield surface by the equivalent constant mean stress triaxial test method are as follows:

[0305] Explanation of the symbols in the following steps: f s is the shear yield function, when f s Shear yielding occurs when ≥0, when f s When s is the relative deviatoric stress, defined by formula (2); H s is the shear hardening parameter; p is the average stress; K s is the shear isotropi...

Embodiment 3

[0424] This embodiment is another application example of the method for measuring the shear yield surface and the volume yield surface of rock and soil materials according to the present invention. At this time, the triaxial tester cannot control the average stress to be a constant value, and Nanjing sand is used as the test material. It includes the determination steps of the shear yield surface, the determination step of the shear shrinkage part of the volume yield surface and the determination step of the dilatation part of the volume yield surface.

[0425] The steps of determining the shear yield surface by the equivalent constant mean stress triaxial test method are as follows:

[0426] Explanation of the symbols in the following steps: f s is the shear yield function, when f s Shear yielding occurs when ≥0, when f s When s is the relative deviatoric stress, defined by formula (2); H s is the shear hardening parameter; p is the average stress; K s is the shear isotro...

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Abstract

The invention relates to a method for determining the shear yield surface and the volume yield surface of geotechnical materials, and relates to the technical field of measuring solid deformation. Inorder to judge stress yield of the geotechnical materials, the shear yield surface is fitted by a quadratic polynomial, and the volume yield surface is fitted by an ellipse and a hyperbola; parametricregression of the shear yield condition of the quadratic polynomial is conducted through a constant average stress triaxial test and a conventional triaxial compression test; parametric regression ofthe volume yield conditions of the ellipse and the hyperbola is conducted through an undrained constant average stress triaxial test and the conventional triaxial compression test; a regression curveof the yield surfaces is drawn according to the shear yield condition, the volume yield conditions and relevant parameters; and according to specific response values of the shear yield condition andthe volume yield conditions in engineering, whether shear yield or volume yield occurs in the geotechnical materials or not is evaluated. According to the method for determining the shear yield surface and the volume yield surface of the geotechnical materials, whether yield of the geotechnical materials exists after stress or not can be judged in engineering, corresponding measures are taken to prevent material damage and collapse accidents.

Description

technical field [0001] The invention belongs to the field of measuring solid deformation, in particular to a method for measuring shear yield surface and volume yield surface of rock and soil materials. Background technique [0002] To predict the stress deformation of geotechnical materials, the constitutive model of geotechnical materials must be established first. To establish the constitutive model of rock and soil materials, the shear yield surface and volume yield surface of rock and soil materials must be measured first. [0003] At present, a large number of geotechnical engineering test results show that the shear yield surface of geotechnical materials has a tendency not to pass through the origin of the meridian plane and has the characteristics of nonlinear expansion with the increase of the average stress on the π plane; the shear part of the volume yield surface The intersection line with the meridian surface has the characteristic that its slope changes with ...

Claims

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Application Information

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IPC IPC(8): G01N3/24
CPCG01N3/24G01N2203/0025
Inventor 马少坤李涛刘莹覃璐韦爱文阮耀民
Owner GUANGXI UNIV
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