Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia

The peak friction angle (φpeak) roughness of discontinuity surfaces is a value that is fundamental to the understanding of shear strength of geological discontinuities, considering its importance in determining the mechanical properties of the discontinuity surface. It is however, both time and cost...

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Main Authors:	Ailie Sofyiana Serasa, Goh, Thian Lai, Abdul Ghani Rafek, Azimah Hussin, Lee, Khai Ern, Tuan Rusli Mohamed
Format:	Article
Language:	English
Published:	Penerbit Universiti Kebangsaan Malaysia 2017
Online Access:	http://journalarticle.ukm.my/10669/ http://journalarticle.ukm.my/10669/ http://journalarticle.ukm.my/10669/1/01%20Ailie%20Sofyiana.pdf

id	ukm-10669
recordtype	eprints
spelling	ukm-106692017-09-20T08:51:04Z http://journalarticle.ukm.my/10669/ Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia Ailie Sofyiana Serasa, Goh, Thian Lai Abdul Ghani Rafek, Azimah Hussin, Lee, Khai Ern Tuan Rusli Mohamed, The peak friction angle (φpeak) roughness of discontinuity surfaces is a value that is fundamental to the understanding of shear strength of geological discontinuities, considering its importance in determining the mechanical properties of the discontinuity surface. It is however, both time and cost demanding to determine the peak friction angle as it requires an extensive series of laboratory tests. This paper presents an approach in the form of an experimentally determined polynomial equation to estimate peak friction angle of limestone discontinuity surfaces by measuring the Joint Roughness Coefficient (JRC) values in a field survey study, and applying the fore mentioned empirical correlation. A total of 1967 tilt tests and JRC measurements were conducted in the laboratory to determine the peak friction angles of rough limestone discontinuity surfaces. The experimental results were analyzed and correlated to establish a polynomial equation of φpeak = -0.0635JRC2 + 3.95JRC + 25.2 with coefficient of determination (R2) of 0.99. The laboratory results were also compared with theoretical results calculated from Barton’s linear equation. The results shown that estimation of peak friction angles were more accurate using the newly proposed polynomial equation since the percentage differences between measured and calculated peak friction angles is less than 6% compared to estimation from Barton’s linear equation where the percentage of differences is less than 11%. The proposed correlation offers a practical method for estimation of peak friction angles of discontinuity surfaces of limestone from measurement of JRC in the field. Penerbit Universiti Kebangsaan Malaysia 2017-02 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/10669/1/01%20Ailie%20Sofyiana.pdf Ailie Sofyiana Serasa, and Goh, Thian Lai and Abdul Ghani Rafek, and Azimah Hussin, and Lee, Khai Ern and Tuan Rusli Mohamed, (2017) Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia. Sains Malaysiana, 46 (2). pp. 181-188. ISSN 0126-6039 http://www.ukm.my/jsm/english_journals/vol46num2_2017/contentsVol46num2_2017.html
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	The peak friction angle (φpeak) roughness of discontinuity surfaces is a value that is fundamental to the understanding of shear strength of geological discontinuities, considering its importance in determining the mechanical properties of the discontinuity surface. It is however, both time and cost demanding to determine the peak friction angle as it requires an extensive series of laboratory tests. This paper presents an approach in the form of an experimentally determined polynomial equation to estimate peak friction angle of limestone discontinuity surfaces by measuring the Joint Roughness Coefficient (JRC) values in a field survey study, and applying the fore mentioned empirical correlation. A total of 1967 tilt tests and JRC measurements were conducted in the laboratory to determine the peak friction angles of rough limestone discontinuity surfaces. The experimental results were analyzed and correlated to establish a polynomial equation of φpeak = -0.0635JRC2 + 3.95JRC + 25.2 with coefficient of determination (R2) of 0.99. The laboratory results were also compared with theoretical results calculated from Barton’s linear equation. The results shown that estimation of peak friction angles were more accurate using the newly proposed polynomial equation since the percentage differences between measured and calculated peak friction angles is less than 6% compared to estimation from Barton’s linear equation where the percentage of differences is less than 11%. The proposed correlation offers a practical method for estimation of peak friction angles of discontinuity surfaces of limestone from measurement of JRC in the field.
format	Article
author	Ailie Sofyiana Serasa, Goh, Thian Lai Abdul Ghani Rafek, Azimah Hussin, Lee, Khai Ern Tuan Rusli Mohamed,
spellingShingle	Ailie Sofyiana Serasa, Goh, Thian Lai Abdul Ghani Rafek, Azimah Hussin, Lee, Khai Ern Tuan Rusli Mohamed, Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia
author_facet	Ailie Sofyiana Serasa, Goh, Thian Lai Abdul Ghani Rafek, Azimah Hussin, Lee, Khai Ern Tuan Rusli Mohamed,
author_sort	Ailie Sofyiana Serasa,
title	Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia
title_short	Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia
title_full	Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia
title_fullStr	Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia
title_full_unstemmed	Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia
title_sort	peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in peninsular malaysia
publisher	Penerbit Universiti Kebangsaan Malaysia
publishDate	2017
url	http://journalarticle.ukm.my/10669/ http://journalarticle.ukm.my/10669/ http://journalarticle.ukm.my/10669/1/01%20Ailie%20Sofyiana.pdf
first_indexed	2023-09-18T19:58:04Z
last_indexed	2023-09-18T19:58:04Z
_version_	1777406663394852864

Peak friction angle estimation from joint roughness coefficient of discontinuities of limestone in Peninsular Malaysia

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