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Method of establishing elastic-plastic mechanical constitutive model made of rock material

A technology of rock material and plastic mechanics, which is used in the analysis of materials, the use of stable tension/pressure to test the strength of materials, scientific instruments, etc. , without considering the material hardening characteristics and other issues, to achieve the effect of wide applicability, high accuracy and high accuracy

Inactive Publication Date: 2015-12-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] (1) The associative flow law is adopted, without considering the difference of axial and lateral deformation;
[0008] (2) Most of them are ideal elastic-plastic models, without considering the hardening characteristics of materials;
[0009] (3) The yield failure surface is single, the difference of deformation failure is not considered, and the expansion is poor

Method used

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  • Method of establishing elastic-plastic mechanical constitutive model made of rock material
  • Method of establishing elastic-plastic mechanical constitutive model made of rock material
  • Method of establishing elastic-plastic mechanical constitutive model made of rock material

Examples

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Embodiment 1

[0053] Taking a rock engineering cataclysmic rock as an example, based on the triaxial conventional mechanical test, the elastoplastic constitutive model of the cataclysmic rock is constructed, and the following operations are performed:

[0054] (1) Based on the on-site drilling of rock cores in a project in western my country, according to the recommended standards of the International Society of Rock Mechanics, a cylindrical specimen with a height-to-diameter ratio of 2:1 was prepared; the diameter of the specimen in this case is 50mm, and the height is 100mm, as shown in Fig. 3(a), Fig. 3(b) and Fig. 3(c); the specimen is installed in the rock triaxial conventional mechanical tester, as figure 2 shown; and adjust the axial and lateral strain to the initial value, the initial value is close to 0;

[0055] (2) Carry out triaxial conventional rock mechanics tests on the specimens. All tests are carried out under constant temperature and humidity conditions; firstly, the confi...

Embodiment 2

[0082] Taking a certain rock engineering sandstone as an example, based on the triaxial conventional mechanical test, the elastic-plastic constitutive model of sandstone is constructed, and the following operations are performed:

[0083] (1) Based on the on-site coring of a sandstone project in my country, and based on the recommended standards of the Rock Mechanics Society, a cylindrical specimen with a height to diameter ratio of 2:1 was prepared; the diameter of the sandstone specimen in this example is 50mm, and the height is 100mm; The parts are installed in the rock triaxial conventional mechanical tester; the axial and lateral strains are adjusted to the initial value, and the initial value is approximately 0;

[0084] (2) Carry out triaxial conventional rock mechanics tests on the specimens. All tests are carried out under constant temperature and humidity conditions; firstly, the confining pressure is applied to a predetermined value at a loading rate of 0.375MPa / min; ba...

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Abstract

The invention discloses a method of establishing an elastic-plastic mechanical constitutive model made of a rock material. The method comprises the following steps: measuring and recording variation values of axial and lateral strains of a rock specimen along with the stress, and calculating a volumetric strain of the rock specimen; drawing a stress-axial / lateral strain relation curve according to recorded full-course axial and lateral strain changes of the rock specimen, and respectively determining a yield failure rule and a hardening rule of the rock material of the specimen; drawing a stress-volumetric strain relation curve according to the calculated volumetric strain of the rock specimen to determine a non-relevant flow rule of the rock material of the specimen; determining the constitutive model by using a thermodynamic elastic-plastic theory in combination with the stress-strain curve, peak stress, yield initial stress and boundary strength of rock. The method disclosed by the invention comprehensively considers the yield rule, the non-relevant flow rule and the hardening rule of the rock material, favorably reflects the elastic-plastic mechanical behavior of the rock material and ensures the uniqueness and the accuracy of the constitutive model.

Description

technical field [0001] The invention relates to a method for constructing a constitutive model of elastic-plastic mechanics of rock materials. Background technique [0002] As the basic constituent material of rock mass, rock engineering, energy mining, underground storage and analysis of geological phenomena require an in-depth understanding of its mechanical properties. Constitutive model construction is an in-depth exploration of rock mechanical properties, and it is also a key link connecting laboratory tests, theoretical analysis and simulation. Accurate mechanical constitutive can not only describe the deformation mechanism of rock, but also reflect its internal damage mechanism. Therefore, the construction of a nonlinear elastoplastic constitutive model is an important content in the study of rock mechanical properties. [0003] The elastoplastic constitutive model of rock materials was first extended based on the classical elastoplastic theory of metal materials, i...

Claims

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Application Information

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IPC IPC(8): G01N3/00G01N3/08
Inventor 张玉王京印赵晶晶金培杰张晓东杨文东
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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