Effect of rock mass properties on skin friction of rock socket

Reliable design of foundation in rock requires an in depth knowledge on its mass properties. Most rock types exhibit high strength and therefore soketed bored pile is often the preferred method for foundation of major structures. However, in situ properties of a rock mass can be so much different fr...

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Main Author:	Alias, Yusliza
Format:	Thesis
Language:	English
Published:	2015
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/53820/1/YuslizaAliasMFKA2015.pdf
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id	my-utm-ep.53820
record_format	uketd_dc
spelling	my-utm-ep.538202017-10-08T10:07:57Z Effect of rock mass properties on skin friction of rock socket 2015-06 Alias, Yusliza TA Engineering (General). Civil engineering (General) Reliable design of foundation in rock requires an in depth knowledge on its mass properties. Most rock types exhibit high strength and therefore soketed bored pile is often the preferred method for foundation of major structures. However, in situ properties of a rock mass can be so much different from intact rock due to its discontinuous state. In addition, these in situ properties are difficult to determine reliably and this often leads to some degree of uncertainties in the design of the bored pile. Consequently, bearing capacity of the in situ rock is often being underestimated. The underestimation is mainly contributed by application of various reduction factors and correlations in the design process. For example ultimate skin friction (fs) and rock socket length (L) are determined empirically, which is based on rock mass properties which are indirectly estimated using intact rock properties. This study is to highlight the importance of obtaining reliable properties of the in situ rock mass for proper utilisation of the rock mass strength. Data obtained from in situ measurement on rock mass, namely in situ modulus (Em) and RQD, have been used to obtain a proper estimation of fs. To verify the positive contribution of these mass properties on the performance of bored pile, comparison was made with fs and L estimated using in situ measurement and empirical approach. Despite of limited field data, this study does indicate that design using rock mass properties from in situ measurement, gives a more reliable value of fs and L, as compared to the empirical approach. Field measurement such as Pressure meter test does help in obtaining a reliable rock mass properties consequently, this allows for effective utilisation of the rock mass strength as an effective foundation. 2015-06 Thesis http://eprints.utm.my/id/eprint/53820/ http://eprints.utm.my/id/eprint/53820/1/YuslizaAliasMFKA2015.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Civil Engineering Faculty of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Alias, Yusliza Effect of rock mass properties on skin friction of rock socket
description	Reliable design of foundation in rock requires an in depth knowledge on its mass properties. Most rock types exhibit high strength and therefore soketed bored pile is often the preferred method for foundation of major structures. However, in situ properties of a rock mass can be so much different from intact rock due to its discontinuous state. In addition, these in situ properties are difficult to determine reliably and this often leads to some degree of uncertainties in the design of the bored pile. Consequently, bearing capacity of the in situ rock is often being underestimated. The underestimation is mainly contributed by application of various reduction factors and correlations in the design process. For example ultimate skin friction (fs) and rock socket length (L) are determined empirically, which is based on rock mass properties which are indirectly estimated using intact rock properties. This study is to highlight the importance of obtaining reliable properties of the in situ rock mass for proper utilisation of the rock mass strength. Data obtained from in situ measurement on rock mass, namely in situ modulus (Em) and RQD, have been used to obtain a proper estimation of fs. To verify the positive contribution of these mass properties on the performance of bored pile, comparison was made with fs and L estimated using in situ measurement and empirical approach. Despite of limited field data, this study does indicate that design using rock mass properties from in situ measurement, gives a more reliable value of fs and L, as compared to the empirical approach. Field measurement such as Pressure meter test does help in obtaining a reliable rock mass properties consequently, this allows for effective utilisation of the rock mass strength as an effective foundation.
format	Thesis
qualification_level	Master's degree
author	Alias, Yusliza
author_facet	Alias, Yusliza
author_sort	Alias, Yusliza
title	Effect of rock mass properties on skin friction of rock socket
title_short	Effect of rock mass properties on skin friction of rock socket
title_full	Effect of rock mass properties on skin friction of rock socket
title_fullStr	Effect of rock mass properties on skin friction of rock socket
title_full_unstemmed	Effect of rock mass properties on skin friction of rock socket
title_sort	effect of rock mass properties on skin friction of rock socket
granting_institution	Universiti Teknologi Malaysia, Faculty of Civil Engineering
granting_department	Faculty of Civil Engineering
publishDate	2015
url	http://eprints.utm.my/id/eprint/53820/1/YuslizaAliasMFKA2015.pdf
_version_	1747817634875834368

Effect of rock mass properties on skin friction of rock socket

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