Determination method for critical plastic yield-point and initial elastic modulus of soil stress-strain curve

A technology of initial elastic modulus and stress-strain curve, applied in the direction of applying stable tension/pressure to test material strength, etc., can solve difficult problems such as the value of initial elastic modulus and the position of the plastic point, and achieve simple calculation , simple test, convenient operation

Inactive Publication Date: 2012-02-22
SHAOXING UNIVERSITY
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Problems solved by technology

[0004] In fact, since the measured stress-strain curve is a relatively smooth discrete point, it is only approximately linear in the initial stage rathe

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  • Determination method for critical plastic yield-point and initial elastic modulus of soil stress-strain curve
  • Determination method for critical plastic yield-point and initial elastic modulus of soil stress-strain curve

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Embodiment Construction

[0020] Such as figure 1 as shown, figure 1 It is a schematic diagram of a method for measuring the critical point of the soil stress-strain curve and the initial modulus of elasticity in this embodiment. Described measuring method comprises the steps:

[0021] The first step is to make soft soil standard samples.

[0022] In the second step, the loading test is carried out on the triaxial apparatus, and the data points of the stress-strain curve are measured.

[0023] The third step is to set the limit value of the linear correlation coefficient.

[0024] The fourth step is preliminary linear fitting. The first three points on the stress-strain curve were selected for linear fitting, and the intercept of the fitting line equation was set to zero to obtain the linear correlation coefficient and fitting equation.

[0025] The fifth step is fitting judgment. If the obtained correlation coefficient is greater than the limit value set in the third step, add a point backward t...

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Abstract

The invention discloses a determination method for a critical plastic yield-point and an initial elastic modulus of a soil stress-strain curve. The method comprises three parts, i.e., triaxial test of soil, determination of a critical plastic yield-point and determination of an initial elastic modulus; the triaxial test is a traditional triaxial test, and a sample to be tested is cylindrical; the determination of the critical plastic yield-point is carried out through determination of a linear correlation coefficient of a fitting straight line; the initial elastic modulus is obtained through the slope of the fitting straight line. The determination method provided in the invention has the advantages of simple test, concise calculation and convenient operation, and has an important meaning for research on establishment of soil constitutive models, engineering numerical simulation, evaluation of foundation stabilization, ground settlement, especially settlement caused by small deformation, etc.

Description

Technical field: [0001] The invention belongs to the field of basic property testing of soil in geotechnical engineering, and relates to a method for measuring the critical point and initial modulus of elasticity of the stress-strain curve of the soil. Background technique: [0002] The deviatoric stress-axial strain curve (hereinafter referred to as "stress-strain curve") test of soil is the premise of determining its related engineering mechanical parameters, and is a necessary condition for geotechnical engineering design and numerical simulation. Laboratory triaxial test is currently a reliable and reliable method for measuring the stress-strain curve of soil. [0003] The test results show that the stress-strain curves of soil can be roughly divided into two types, namely hardening curves and softening curves. No matter what kind of curve, the soil always has a linear elastic deformation range in the initial compression stage, and then gradually enters the elastic-plas...

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Application Information

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IPC IPC(8): G01N3/08
Inventor 王伟周爱兆刘琦李娜冯丽
Owner SHAOXING UNIVERSITY
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