Fatigue behaviour of weathered rock under cyclic loading / Nurul Ainain Mohd Salim

Cyclic loading contributes to the degradation of strength and eventually to the failure of rock. However, cyclic loading investigations have been limited to fresh and jointed rock especially in temperate countries. This research aims to investigate the fatigue behaviour of tropically weathered rock...

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Main Author:	Mohd Salim, Nurul Ainain
Format:	Thesis
Language:	English
Published:	2018
Subjects:	Mechanics of engineering Applied mechanics
Online Access:	https://ir.uitm.edu.my/id/eprint/26964/1/TP_NURUL%20AINAIN%20MOHD%20SALIM%20EC%2018_5.pdf
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spelling	my-uitm-ir.269642019-12-27T05:20:51Z Fatigue behaviour of weathered rock under cyclic loading / Nurul Ainain Mohd Salim 2018 Mohd Salim, Nurul Ainain Mechanics of engineering. Applied mechanics Dynamic loading conditions. Structural dynamics. Vibrations Cyclic loading contributes to the degradation of strength and eventually to the failure of rock. However, cyclic loading investigations have been limited to fresh and jointed rock especially in temperate countries. This research aims to investigate the fatigue behaviour of tropically weathered rock under cyclic loading. Weathered rock is grouped together according to its strength classification by ISRM (2007). High strength to low strength weathered granite and quartzite is selected as rock specimens because they are the most abundant rocks to be found in Malaysia while quartzite are one of the most problematic rocks to be tested in laboratory. Characterization of weathered rock was carried out prior determining the cyclic behaviour of rock material. Characterizations such as rebound number, moisture content, compressive strength as well as velocity are determined. Uniaxial compressive strength (UCS) of rock; which later introduced as static strength is also determined to use under cyclic loading as maximum and minimum applied strength. Under cyclic uniaxial compression load, frequency of 1 Hz and constant sinusoidal waveform was applied onto weathered rock specimen. Stress ratio; which is the ratio of minimum to maximum applied stress is kept similar at 0.17 to be under cyclic load test. The cyclic load test was set at three different stress level of 70% (0.7oc) , 80% (0.8ac) and 90% (0.9ac) of static strength. Between these three stress levels; 0.9ac shows significant impact on high to granite-A and quartzite-A. However, for granite-C and quartzite-C rock shows the least impact during the stress level of 0.9ac due to small stress amplitude. The fatigue strength of weathered rock at 0.9ac, shows both granite-A and quartzite-A has lower in fatigue strength as compared to granite-C and quartzite-C. Based on the result, fatigue life of granite-A, granite-B and granite-C is about 83%, 82%), 75%) of static strength. While for quartzite-A and quartzite-B, the fatigue life is about 83% and 78%) of static strength. With the exclusion of quartzite-C, it can be concluded that the fatigue life of weathered quartzite is less than the fatigue life of weathered granite. 2018 Thesis https://ir.uitm.edu.my/id/eprint/26964/ https://ir.uitm.edu.my/id/eprint/26964/1/TP_NURUL%20AINAIN%20MOHD%20SALIM%20EC%2018_5.pdf text en public phd doctoral Universiti Teknologi MARA Faculty of Civil Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Mechanics of engineering Applied mechanics Mechanics of engineering Applied mechanics
spellingShingle	Mechanics of engineering Applied mechanics Mechanics of engineering Applied mechanics Mohd Salim, Nurul Ainain Fatigue behaviour of weathered rock under cyclic loading / Nurul Ainain Mohd Salim
description	Cyclic loading contributes to the degradation of strength and eventually to the failure of rock. However, cyclic loading investigations have been limited to fresh and jointed rock especially in temperate countries. This research aims to investigate the fatigue behaviour of tropically weathered rock under cyclic loading. Weathered rock is grouped together according to its strength classification by ISRM (2007). High strength to low strength weathered granite and quartzite is selected as rock specimens because they are the most abundant rocks to be found in Malaysia while quartzite are one of the most problematic rocks to be tested in laboratory. Characterization of weathered rock was carried out prior determining the cyclic behaviour of rock material. Characterizations such as rebound number, moisture content, compressive strength as well as velocity are determined. Uniaxial compressive strength (UCS) of rock; which later introduced as static strength is also determined to use under cyclic loading as maximum and minimum applied strength. Under cyclic uniaxial compression load, frequency of 1 Hz and constant sinusoidal waveform was applied onto weathered rock specimen. Stress ratio; which is the ratio of minimum to maximum applied stress is kept similar at 0.17 to be under cyclic load test. The cyclic load test was set at three different stress level of 70% (0.7oc) , 80% (0.8ac) and 90% (0.9ac) of static strength. Between these three stress levels; 0.9ac shows significant impact on high to granite-A and quartzite-A. However, for granite-C and quartzite-C rock shows the least impact during the stress level of 0.9ac due to small stress amplitude. The fatigue strength of weathered rock at 0.9ac, shows both granite-A and quartzite-A has lower in fatigue strength as compared to granite-C and quartzite-C. Based on the result, fatigue life of granite-A, granite-B and granite-C is about 83%, 82%), 75%) of static strength. While for quartzite-A and quartzite-B, the fatigue life is about 83% and 78%) of static strength. With the exclusion of quartzite-C, it can be concluded that the fatigue life of weathered quartzite is less than the fatigue life of weathered granite.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mohd Salim, Nurul Ainain
author_facet	Mohd Salim, Nurul Ainain
author_sort	Mohd Salim, Nurul Ainain
title	Fatigue behaviour of weathered rock under cyclic loading / Nurul Ainain Mohd Salim
title_short	Fatigue behaviour of weathered rock under cyclic loading / Nurul Ainain Mohd Salim
title_full	Fatigue behaviour of weathered rock under cyclic loading / Nurul Ainain Mohd Salim
title_fullStr	Fatigue behaviour of weathered rock under cyclic loading / Nurul Ainain Mohd Salim
title_full_unstemmed	Fatigue behaviour of weathered rock under cyclic loading / Nurul Ainain Mohd Salim
title_sort	fatigue behaviour of weathered rock under cyclic loading / nurul ainain mohd salim
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Civil Engineering
publishDate	2018
url	https://ir.uitm.edu.my/id/eprint/26964/1/TP_NURUL%20AINAIN%20MOHD%20SALIM%20EC%2018_5.pdf
_version_	1783733919284199424

Fatigue behaviour of weathered rock under cyclic loading / Nurul Ainain Mohd Salim

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