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Method for constructing failure criterion of rock under triaxial compression condition

A technology of triaxial compression and construction method, which is applied in the direction of using stable tension/pressure to test the strength of materials, complex mathematical operations, measuring devices, etc., which can solve the problem of overestimating the peak strength of the low confining pressure section and unable to characterize the high confining pressure section Problems such as nonlinear characteristics of rock failure

Active Publication Date: 2020-12-01
CENT SOUTH UNIV
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Problems solved by technology

[0009] S1. In view of the problem that the linear Mohr-Coulomb criterion overestimates the peak strength of the low confining pressure section and cannot characterize the nonlinear characteristics of rock failure in the high confining pressure section, a new intermediate variable is constructed based on the Mohr-Coulomb criterion and the internal friction angle φ

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  • Method for constructing failure criterion of rock under triaxial compression condition
  • Method for constructing failure criterion of rock under triaxial compression condition
  • Method for constructing failure criterion of rock under triaxial compression condition

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[0067] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0068] The method for constructing the failure criterion of the rock under the triaxial compression condition disclosed by the present invention comprises the following steps:

[0069] S1. In view of the problem that the linear Mohr-Coulomb criterion overestimates the peak strength of the low confining pressure section and cannot characterize the nonlinear characteristics of rock failure in the high confining pressure sectio...

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Abstract

The invention discloses a method for constructing a failure criterion of rock under a triaxial compression condition. The method comprises the following steps: S1, aiming at the problems of the linearMohr-Coulomb criterion that the peak intensity of a low-confining-pressure section is overestimated, and nonlinear characteristics of rock failure in a high-confining-pressure section cannot be characterized, constructing a new intermediate variable shown in the specification by virtue of the Mohr-Coulomb criterion and an internal friction angle phi; S2, establishing a reasonable function expression of the intermediate variable X changing along with confining pressure sigma 3 based on theoretical analysis and test result analysis; S3, substituting the intermediate variable into the Mohr-Coulomb criterion, and obtaining a new empirical failure criterion expression for rock conventional triaxial compression analysis through parameter replacement; and S4, verifying the established criterionby adopting test data of various rocks, and proving the superiority of the established criterion by comparing the established criterion with the existing five common criteria.

Description

technical field [0001] The invention belongs to the research field of failure criteria of rocks under conventional triaxial compression stress state, and in particular relates to a construction method of failure criteria of rocks under triaxial compression conditions. Background technique [0002] With the increase of engineering activities in the world, the study of rock failure behavior under complex geological conditions has attracted more and more attention. Among them, the evaluation of rock failure criteria is crucial to geotechnical engineering practice. Typically, there are many forms of failure criteria, including stress failure criteria, energy failure criteria, and strain failure criteria, among which the stress failure criterion is the most commonly used criterion in the field of rock engineering. Therefore, it is of great practical significance to study the stress failure criterion of rocks for the safe and economical design of geotechnical engineering structur...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G06F17/12
CPCG01N3/08G01N2203/0256G06F17/12
Inventor 林杭谢世杰曹日红陈怡帆汪亦显
Owner CENT SOUTH UNIV
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