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A Method for Constructing Failure Criterion of Rock Under Triaxial Compression

A technology of triaxial compression and construction method, applied in the direction of applying stable tension/pressure to test the strength of materials, complex mathematical operations, instruments, etc. The peak strength of the pressure section is solved, and the parameters are clear and easy to find, the model form is simple, and the physical meaning is clear.

Active Publication Date: 2021-09-28
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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  • A Method for Constructing Failure Criterion of Rock Under Triaxial Compression
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  • A Method for Constructing Failure Criterion of Rock Under Triaxial Compression

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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 failure criteria of rocks under triaxial compression conditions, comprising the following steps: S1. In view of the fact that the linear Mohr-Coulomb criterion overestimates the peak strength of the low confining pressure section and cannot characterize the rock failure characteristics of the high confining pressure section For the problem of linear characteristics, a new intermediate variable S2 is constructed based on the Mohr-Coulomb criterion and the internal friction angle φ. 3 Reasonable functional expressions for changes; S3. Bring intermediate variables into the Mohr-Coulomb criterion, and obtain a new empirical failure criterion expression for conventional triaxial compression analysis of rocks through parameter substitution; S4. Adopt a variety of rocks The test data of the present invention verifies the criteria established by the present invention, and proves the superiority of the criteria established by the present invention by comparing 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 Patents(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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