Method for judging macroscopic and microscopic behavior relation of brittle rock based on compression test
A brittle rock, compression test technology, applied in the direction of applying stable tension/compression to test material strength, strength characteristics, processing detection response signals, etc.
Active Publication Date: 2020-10-13
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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Problems solved by technology
However, it is still a difficult problem to establish the relationship between rock mesoscopic crack properties and macroscopic deformation through simple experiments.
Method used
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Embodiment
[0034] This embodiment provides a method for judging the relationship between macro and micro behaviors of brittle rocks based on compression tests, including the following steps:
[0035] S1: Select a rock for conventional triaxial compression test;
[0036] S2: Using acoustic emission monitoring instruments to measure the law of acoustic emission events inside rocks;
[0037] S3: Define rock damage equation based on rock acoustic emission data;
[0038] S4: Equations defining macroscopic axial strain-related rock damage;
[0039] S5: Simultaneously combine the two damage equations of the rock damage equation and the rock damage equation related to the macroscopic axial strain, and establish the relationship between the stage-accumulated acoustic emission rate of the rock and the macroscopic deformation of the rock;
[0040] S6: The parameters m and ε measured based on the test o , μ, E, σ r , σ P , C d , C 0 Substituting the rock damage equation and the rock damage eq...
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The invention discloses a method for judging macroscopic and microscopic behavior relation of brittle rock based on a compression test. Rock damage parameters are respectively defined according to rock deformation and acoustic emissivity data obtained by a conventional triaxial compression acoustic emission monitoring test result, and then the relationship between rock deformation and rock acoustic emissivity is deduced by combining two damage equations. The acoustic emissivity of the rock indirectly reflects the characteristics of microscopic crack propagation, penetration, nucleation and thelike of the rock, so that the change behavior of the microscopic crack of the rock is well revealed through a macroscopic imaging test by virtue of the established deformation and acoustic emissivityrelation equation. The method has the advantages that brittle rock deformation can be directly judged through simple acoustic emission monitoring data, and then a certain judgment basis is provided for more accurate, safer and more efficient deep underground engineering design and construction.
Description
technical field [0001] The invention relates to the technical field of deep rock mechanics engineering, in particular to a method for judging the relationship between macro and micro behaviors of brittle rocks based on compression tests. Background technique [0002] With the continuous development of my country's economy, the demand for the construction of deep underground space buildings is increasing day by day. Complex environmental factors such as deep high ground stress have a very important impact on the stability of surrounding rock in underground space. Brittle rocks, such as granite, marble, etc., are the main components of deep underground engineering surrounding rocks, so the study of the stress-strain constitutive relationship of brittle rocks is the basis for the stability evaluation of deep underground engineering surrounding rocks. [0003] In addition, the behaviors of mesoscopic crack initiation, propagation, penetration and nucleation have an important im...
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IPC IPC(8): G01N29/14G01N29/44G01B17/04G01N3/08
CPCG01N29/14G01N29/4472G01B17/04G01N3/08G01N2291/0232G01N2291/0289G01N2203/0019G01N2203/0075G01N2203/0066G01N2203/0256G01N2203/0658
Inventor 李晓照夏晨班力壬戚承志
Owner BEIJING UNIV OF CIVIL ENG & ARCHITECTURE