The effect of intermediate principal stress on 3D crack growth in compression and rock failure

Hongyu Wang

doi:10.26182/5ee02cd4192e9

The effect of intermediate principal stress on 3D crack growth in compression and rock failure

Hongyu Wang

School of Engineering

Research output: Thesis › Doctoral Thesis

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Abstract

A range of failure mechanisms from small scale spallation under fire to large scale rockbursts in mining excavations involve extensive crack growth in biaxial compression. The thesis investigates this type of crack growth using biaxial compression testing with different load ratios of frozen resin samples containing 3D internal defects of different types. The triggering nature of the intermediate principal stress was discovered: when its magnitude is above a certain threshold (5-8.5% of the major principal stress) it changes the mechanism of propagation of real three dimensional cracks allowing them to grow extensively to the sizes causing catastrophic rock failure.

Original language	English
Qualification	Doctor of Philosophy
Awarding Institution	The University of Western Australia
Supervisors/Advisors	Hsieh, Ariel, Supervisor Dight, Phil, Supervisor Dyskin, Arcady, Supervisor
Award date	13 Apr 2020
DOIs	https://doi.org/10.26182/5ee02cd4192e9
Publication status	Unpublished - 2019

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10.26182/5ee02cd4192e9

THESIS - DOCTOR OF PHILOSOPHY - WANG, Hongyu - 2019
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title = "The effect of intermediate principal stress on 3D crack growth in compression and rock failure",

abstract = "A range of failure mechanisms from small scale spallation under fire to large scale rockbursts in mining excavations involve extensive crack growth in biaxial compression. The thesis investigates this type of crack growth using biaxial compression testing with different load ratios of frozen resin samples containing 3D internal defects of different types. The triggering nature of the intermediate principal stress was discovered: when its magnitude is above a certain threshold (5-8.5% of the major principal stress) it changes the mechanism of propagation of real three dimensional cracks allowing them to grow extensively to the sizes causing catastrophic rock failure.",

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AB - A range of failure mechanisms from small scale spallation under fire to large scale rockbursts in mining excavations involve extensive crack growth in biaxial compression. The thesis investigates this type of crack growth using biaxial compression testing with different load ratios of frozen resin samples containing 3D internal defects of different types. The triggering nature of the intermediate principal stress was discovered: when its magnitude is above a certain threshold (5-8.5% of the major principal stress) it changes the mechanism of propagation of real three dimensional cracks allowing them to grow extensively to the sizes causing catastrophic rock failure.

KW - Three-dimensional crack

KW - Biaxial compression

KW - Intermediate principal stress

KW - Rock failure

U2 - 10.26182/5ee02cd4192e9

DO - 10.26182/5ee02cd4192e9

M3 - Doctoral Thesis

ER -

The effect of intermediate principal stress on 3D crack growth in compression and rock failure

Abstract

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