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Method for establishing rock material ageing and elastic-plastic mechanics constitutive model

A constitutive model and rock material technology, applied in the direction of applying stable tension/pressure to test the strength of materials, can solve difficult three-dimensional constitutive relations, errors and other problems, and achieve easy popularization and application, high accuracy, and good scalability Effect

Inactive Publication Date: 2016-01-20
CHINA UNIV OF PETROLEUM (EAST CHINA)
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Problems solved by technology

However, it is difficult for this model to construct a three-dimensional constitutive relationship, which leads to a discrepancy with the actual engineering rock under the action of three-dimensional stress; therefore, it is bound to cause certain errors when applied to the analysis of long-term mechanical properties of actual engineering
[0009] In summary, the existing methods for constructing the aging-elastoplastic constitutive model of rock materials still have certain defects.

Method used

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  • Method for establishing rock material ageing and elastic-plastic mechanics constitutive model
  • Method for establishing rock material ageing and elastic-plastic mechanics constitutive model
  • Method for establishing rock material ageing and elastic-plastic mechanics constitutive model

Examples

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Embodiment 1

[0073] Taking a rock engineering cataclysmic rock as an example, based on triaxial short-term and long-term rock mechanics tests, the aging-elastic-plastic constitutive model of cataclysmic rock is constructed, and the following operations are performed:

[0074] (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); install the test piece in the rock triaxial short-term and long-term mechanical tester, as shown in Fig. figure 2 shown; and adjust the axial and lateral strain to the initial value, the initial value is close to 0;

[0075] (2) Carry out triaxial short-term conventional rock mechanics tests on the specimens. All tests are carried out under constant temp...

Embodiment 2

[0124] Taking a certain rock engineering sandstone as an example, based on triaxial short-term and long-term rock mechanics tests, the constitutive model of sandstone elastoplastic mechanics is constructed, and the following operations are performed:

[0125] (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; Install the parts into the rock triaxial short-term and long-term rock mechanics tester; adjust the axial and lateral strains to the initial value, and the initial value is approximately 0;

[0126] (2) Carry out triaxial short-term conventional rock mechanics tests on the specimens. All tests are carried out under constant temperature and humidity conditions; The values ​​are 2.0, 6.0 and 10.0MPa; secondly, the deviatoric ...

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Abstract

The invention discloses a method for establishing a rock material ageing and elastic-plastic mechanics constitutive model. The method includes the steps that the triaxial short-long term test result of rock is used as the basis first, and the volumetric strains of a rock test piece under different test conditions are calculated; by drawing a stress-axial and lateral strain relation curve and a stress-volumetric strain relation curve, the yield criterion, the non-associated flow rule and the hardening criterion of the rock are determined, and an elastic-plastic mechanics model is established; then by combining material micro and fine damage attenuation ageing evolution dynamic equilibrium, the micro and fine ageing damage rule of the rock is determined, the model is popularized, a relation matrix of strain increment and stress increment at the ageing-elasticoplastic deformation stage is established, and accordingly the rock material ageing and elastic-plastic mechanics constitutive model is obtained. According to the model, the mechanics significance is definite, the expression is unique, the number of parameters is small and can be obtained based on the test results, hence, solving uniqueness and accuracy are guaranteed, and wide applicability and expansibility are achieved.

Description

technical field [0001] The invention relates to a construction method of a rock material aging-elastic-plastic mechanics constitutive model. Background technique [0002] Rock deformation under load has an obvious time effect, also known as aging characteristics, which is closely related to the long-term stability of the project. At present, the service life of rock-related projects such as petroleum engineering, mining engineering, water conservancy engineering and nuclear waste treatment engineering is as long as tens to hundreds of years. Therefore, research on rock aging-elastic-plastic mechanical properties has important theoretical significance and engineering value for long-term stability evaluation and safety of engineering. [0003] 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 describ...

Claims

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Application Information

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IPC IPC(8): G01N3/08
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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