Understanding induced fracture instability based on the Mohr-Coulomb failure criterion

This study aims to investigate the failure mechanism of rock fractures induced by excavation unloading and fluid injection in Singapore Bukit Timah granite. The experimental tests on unloading-induced and injection-induced fracture instability are conducted based on the shear-flow experiments. The t...

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Main Author: Liu, Mengqin
Other Authors: Wu Wei (CEE)
Format: Theses and Dissertations
Language:English
Published: 2018
Subjects:
Online Access:http://hdl.handle.net/10356/74657
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-746572023-03-03T19:34:46Z Understanding induced fracture instability based on the Mohr-Coulomb failure criterion Liu, Mengqin Wu Wei (CEE) School of Civil and Environmental Engineering DRNTU::Engineering::Civil engineering::Geotechnical This study aims to investigate the failure mechanism of rock fractures induced by excavation unloading and fluid injection in Singapore Bukit Timah granite. The experimental tests on unloading-induced and injection-induced fracture instability are conducted based on the shear-flow experiments. The tests on unloading-induced fracture instability consist of three groups of experiments: the influences of initial normal stress, shear stress level, and unloading rate. The result shows that reducing initial normal stress, shear stress level and unloading rate slowly can help to prevent the unloading-induced fracture instability. The tests on injection-induced fracture instability consider the effect of fluid overpressure and show that the mechanism of injection-induced fracture instability is similar to the mechanism of unloading-induced fracture instability. The results obtained from both experiments indicate that the mechanism of induced seismicity can be interpreted by the Mohr–Coulomb failure criterion through different approaches of moving and modifying the Mohr circle approaching the failure envelope. Master of Science (Civil Engineering) 2018-05-23T01:04:22Z 2018-05-23T01:04:22Z 2018 Thesis http://hdl.handle.net/10356/74657 en 48 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Engineering::Civil engineering::Geotechnical
spellingShingle DRNTU::Engineering::Civil engineering::Geotechnical
Liu, Mengqin
Understanding induced fracture instability based on the Mohr-Coulomb failure criterion
description This study aims to investigate the failure mechanism of rock fractures induced by excavation unloading and fluid injection in Singapore Bukit Timah granite. The experimental tests on unloading-induced and injection-induced fracture instability are conducted based on the shear-flow experiments. The tests on unloading-induced fracture instability consist of three groups of experiments: the influences of initial normal stress, shear stress level, and unloading rate. The result shows that reducing initial normal stress, shear stress level and unloading rate slowly can help to prevent the unloading-induced fracture instability. The tests on injection-induced fracture instability consider the effect of fluid overpressure and show that the mechanism of injection-induced fracture instability is similar to the mechanism of unloading-induced fracture instability. The results obtained from both experiments indicate that the mechanism of induced seismicity can be interpreted by the Mohr–Coulomb failure criterion through different approaches of moving and modifying the Mohr circle approaching the failure envelope.
author2 Wu Wei (CEE)
author_facet Wu Wei (CEE)
Liu, Mengqin
format Theses and Dissertations
author Liu, Mengqin
author_sort Liu, Mengqin
title Understanding induced fracture instability based on the Mohr-Coulomb failure criterion
title_short Understanding induced fracture instability based on the Mohr-Coulomb failure criterion
title_full Understanding induced fracture instability based on the Mohr-Coulomb failure criterion
title_fullStr Understanding induced fracture instability based on the Mohr-Coulomb failure criterion
title_full_unstemmed Understanding induced fracture instability based on the Mohr-Coulomb failure criterion
title_sort understanding induced fracture instability based on the mohr-coulomb failure criterion
publishDate 2018
url http://hdl.handle.net/10356/74657
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