 |
 |
 |
 |
 |
 |
Sains Malaysiana 45(11)(2016): 1603–1607
Assessment of Ultimate Bearing Capacity
based on the Hoek-Brown Failure Criterion (Penilaian Keupayaan Galas Muktamad berdasarkan Kriteria Kegagalan Hoek-Brown) GOH
THIAN
LAI1*,
MD. SELIM
REZA1,
ABDUL
GHANI
RAFEK2,
AILIE
SOFYIANA
SERASA1, AZIMAH HUSSIN1,3 & LEE
KHAI
ERN4 1Geology Program, School of Environmental
and Natural Resource Sciences, Faculty of Science and Technology,
Universiti Kebangsaan Malaysia, 43600,
UKM Bangi, Selangor Darul Ehsan Malaysia 2Department of Geosciences, Universiti Teknologi PETRONAS, Bandar
Seri Iskandar 31750 Tronoh,
Perak Darul Ridzuan, Malaysia 3Chemical & Petroleum Engineering
Department, Faculty of Engineering, Technology & Built Environment
(FETBE), UCSI University, 56000 Cheras,
Kuala Lumpur, Malaysia 4Institute for Environment and Development
(LESTARI), Universiti Kebangsaan Malaysia 43600, UKM Bangi, Selangor Darul
Ehsan, Malaysia Diserahkan: 26 Oktober
2015/Diterima: 5 April 2016 ABSTRACT The ultimate bearing capacity
is an essential requirement in design quantification for shallow
foundations especially for structures built on large rock masses.
In many engineering projects, structures built on foundation of
heavily jointed rock masses may face issues such as instability
and sudden catastrophic rock slope failure. Determination of the
ultimate bearing capacity (Qult)
of foundations resting on rock mass has traditionally been determined
by employing several strength criterions. One of the accepted
and widely implemented methods is to use the Hoek-Brown failure
criterion 2002, where the required parameters are determined from
a rock mass classification system, Geological Strength Index (GSI). This paper defines an assessment
for ultimate bearing capacity (Qult)
based on the Hoek-Brown failure criterion 2002 for a granitic
rock slope beneath a 20 m diameter concrete water tank at Bandar
Mahkota Cheras,
Kajang, Selangor. Based on the Hoek-Brown
failure criterion 2002, the ultimate bearing capacity (Qult) of rock mass was 7.91 MPa. The actual stress
acting on the rock mass was 0.32 MPa. The assessment showed that
the rock mass is safe since the ultimate bearing capacity (Qult)
is 24.7 times higher than the actual stress acting on the rock
mass. Keywords: Geological Strength
Index; Hoek-Brown failure criterion 2002; rock mass; ultimate
bearing capacity ABSTRAK Keupayaan galas muktamad merupakan
keperluan penting
dalam reka bentuk
pengkuantitian bagi asas cetek terutama
bagi struktur
yang dibina di atas jasad batuan yang besar. Dalam banyak
projek kejuruteraan,
struktur yang dibina di atas asas jasad
batuan berkekar
banyak yang besar mungkin menghadapi isu seperti ketidakstabilan
dan bencana
kegagalan cerun batu secara tiba-tiba.
Penentuan
keupayaan galas muktamad (Qult) pada asas yang berada di atas jasad batuan
secara tradisi
telah ditentukan dengan menggunakan beberapa kriteria kekuatan. Salah satu kaedah yang diterima dan diguna pakai
secara meluas
adalah menggunakan kriteria kegagalan Hoek-Brown 2002
dan parameter yang dikehendaki
ditentukan daripada
pengelasan sistem jasad batuan, Indeks
Kekuatan Geologi
(GSI).
Kertas ini
mentakrifkan penilaian bagi keupayaan galas muktamad (Qult)
berdasarkan kriteria
kegagalan Hoek-Brown 2002 untuk
satu cerun batu
granit di bawah tangki air konkrit berdiameter 20 m di Bandar
Mahkota Cheras,
Kajang, Selangor. Berdasarkan kriteria kegagalan
Hoek-Brown 2002, keupayaan galas muktamad
(Qult) jasad
batuan adalah
7.91 MPa. Tegasan
sebenar yang bertindak atas jasad batuan
ialah 0.32 MPa. Penilaian menunjukkan
bahawa jasad
batuan adalah selamat
kerana keupayaan
galas muktamad (Qult)
adalah 24.7 kali lebih
tinggi daripada tegasan sebenar yang bertindak di atas jasad batuan. Kata kunci: Indeks
Kekuatan Geologi;
jasad batuan; keupayaan
galas muktamad; kriteria
kegagalan Hoek-Brown 2002 RUJUKAN Bieniawski, Z.T. 1989. Engineering
Rock Mass Classification. Chichester:
Wiley. Bignell, J.D.
& Snelling, N.J. 1977. Geochronology
of Malayan granites. Overseas Geology and Mineral Resoures
47: 71. Ghani
Rafek, A. & Goh, T.L. 2012. Correlation of joint roughness coefficient (JRC)
and peak friction angles of discontinuities of Malaysian schists.
Earth Science Research 1(1). doi:10.5539/
esr.v1n1p57. Goh, T.L., Ghani
Rafek, A., Ailie, S.S., Norbert, S.,
Azimah, H. & Lee, K.E. 2015a. Correlation of
ultrasonic velocity slowness with uniaxial compressive strength
of schists in Malaysia. Electronic Journal Geotechnical
Engineering 20: 12663-12670. Goh, T.L., Norbert, S., Azimah, H., Ailie, S.S. & Ghani
Rafek, A. 2015b. Weathering related rock material strength reduction:
the Malaysian granites. International Conference on Engineering
Geology in New Millennium, 27-29 October, IIT Delhi. New Delhi.
Journal of Engineering Geology Special
Publication. pp. 1445-1450. Goh, T.L., Norbert, S., Azimah, H. & Ghani Rafek, A. 2015c. Impact
of weathering on rock material strength of granite. International
Conference on Geology June 22-23, 2015 Florida, USA.
Journal of Geology & Geophysics DOI: 10.4172/2329-6755.S1.003
Goh, T.L., Ghani
Rafek, A., Ailie, S.S., Norbert, S.
Lee, K.E. & Azimah, H. 2015d. Empirical correlation
of uniaxial compressive strength and primary wave velocity of
Malaysian schists. Electronic Journal Geotechnical Engineering
20: 1801-1812. Goh, T.L., Ghani
Rafek, A., Ailie, S.S., Norbert, S.,
Lee, K.E. & Azimah, H. 2014. Empirical correlation
of uniaxial compressive strength and primary wave velocity of
Malaysian granites. Electronic Journal Geotechnical
Engineering 19(E): 1063-1072. Goh, T.L., Rahim
Samsudin, A. & Abdul Ghani Rafek. 2011a. The
application of the spectral analysis of surface wave method for
rock mass characterization. Journal of Environmental and Engineering
Geoscience 17(1): 77-84. Goh, T.L., Rahim
Samsudin, A. & Ghani Rafek, A. 2011b. Application of spectral analysis
of surface waves (SASW) method: Rock mass characterization. Sains
Malaysiana 40(5): 425-430. Goh, T.L., Ghani Rafek, A., Hariri
Ariffin, M. & Baizura
Yunus, N. 2011c. Direct shear test of
granite discontinuity plane surface. Sains
Malaysiana 40(5): 419-423. Goh, T.L., Ghani Rafek, A., Rahim
Samsudin, A., Hariri Ariffin,
M. & Baizura Yunus,
N. 2011d. Rock mass geomechanical characterization
by seismic methods: Poisson’s ratio. Sains
Malaysiana 40(6): 561-568. Hoek, E., Carranza-Torres,
C.T. & Corkum, B. 2002. Hoek- Brown failure
criterion-2002 edition. Proceedings
of the 5th North American Rock Mechanics Symposium, Toronto,
Canada. 1: 267-273. Hoek, E., Marinos, P. & Benissi, M. 1998.
Applicability of the Geological Strength Index (GSI) classification
for very weak and sheared rock masses. The
case of the Athens schist formation. Bull. Engg. Geol. Env. 57(2): 151-160.
Norbert, S., Rodeano, R., Ghani Rafek, A., Goh, T.L., Noran, N.N.A., Kamilia, S., Nightingle, L.M., Azimah, H. &
Lee, K.E. 2016.
Rock mass assessment using Geological Strength
Index (GSI) along the Ranau-Tambunan
Road, Sabah, Malaysia. Research Journal of Applied Sciences,
Engineering and Technology 12(1): 108-115. *Pengarang
untuk surat-menyurat;
email: gdsbgoh@gmail.com
|
|||
|
