Sains Malaysiana 48(4)(2019): 757–763
http://dx.doi.org/10.17576/jsm-2019-4804-07
Pencirian Geomekanik Jasad Batuan dan Analisis
Kestabilan Cerun di Laman Granview, Saujana Puchong, Selangor,
Malaysia
(Geomechanical Characterisation of Rock Mass and
Slope Stability Analysis at Laman Granview, Saujana Puchong, Selangor,
Malaysia)
ABDUL GHANI RAFEK2, ONG BOK CHENG1 & GOH THIAN LAI1*
1Program Geologi, Pusat Pengajian Sains Sekitaran dan Sumber
Alam, Fakulti Sains dan Teknologi, 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
Diserahkan: 28 Mac 2017/Diterima: 28
September 2017
ABSTRAK
Satu kajian pencirian geomekanik
jasad batuan dan analisis kestabilan dua cerun terletak di tapak pembinaan
Laman Granview di Saujana Puchong, Selangor telah dijalankan. Kawasan kajian
merupakan sebahagian Formasi Bukit Kenny. Kajian telah dijalankan pada dua buah
cerun potongan di tapak binaan adalah survei ketakselanjaran dan pencirian
mekanik batuan. Kuarzit adalah litologi yang dominan di kawasan ini dengan
sedikit filit. Ujian mekanik batuan berikut dijalankan: Ujian kekuatan mampatan
sepaksi, ujian indeks beban titik dan ujian kekuatan regangan Brazil, ujian
pantulan tukul Schmidt dan ujian Skleroskop Shore. Ujian kemiringan untuk
penentuan kekasaran permukaan satah ketakselanjaran dijalankan pada sampel
bongkah batuan. Hasil survei ketakselanjaran menunjukkan terdapat empat set
ketakselanjaran yang utama di cerun L1 dengan nilai arah kemiringan/sudut
kemiringan 62°/42°, 261°/79°, 281°/59° dan 237°/71°. Di cerun L2, terdapat tiga
set ketakselanjaran utama iaitu dengan nilai arah kemiringan/sudut kemiringan 81°/41°,
171°/71° dan 198°/60°. Untuk ujian kemiringan, nilai purata sudut geseran
puncak (fp) permukaan satah ketakselanjaran batu kuarzit dengan
Pekali Kekasaran Kekar (PKK) 8-10 adalah 61°. Ketakselanjaran
batuan kuarzit dengan nilai PKK 10-12 pula mempunyai purata
sudut geseran puncak (fp) sebanyak 73°. Manakala, nilai
purata sudut geseran puncak (fp) batuan filit dengan PKK 4-6
ialah 56°. Berdasarkan analisis kinematik, cerun L1 adalah stabil. Ragam
kegagalan cerun L2 pula adalah kegagalan satah tetapi nilai sudut geseran
permukaan satah yang tinggi akan menghalang kegagalan berlaku. Nilai perkadaran
jasad batuan (RMR) bagi batuan kuarzit ialah 77 dan batuan filit ialah
66 dengan kedua-dua tergolong dalam batuan yang baik dalam kelas II.
Kata kunci: Analisis kinematik
kestabilan cerun; perkadaran jasad batuan (RMR);
ujian kemiringan
ABSTRACT
A study was conducted at the construction
site of Laman Granview, Saujana Puchong, Selangor to study the
stability of two slopes and the geomechanical properties of the
rock mass. The study site is part of the Kenny Hill Formation.
Surveys were carried out at two cut slopes at construction site
were discontinuity surveys and rock mechanics characterisation.
Quartzite is the dominant lithology in this area with minor amounts
of phyllite. The following rock mechanics tests were conducted:
Uniaxial compressive test, point load index test, Brazilian tensile
strength test, Schmidt rebound hammer test and Shore Scleroscope
test. Tilt tests for determining the surface roughness of discontinuities
were conducted on rock block. The results of discontinuities survey
showed that there are four major sets of discontinuities at cut
slope L1 with dip directions/dip values of 62°/42°, 261°/79°,
281°/59° and 237°/71°. At cut slope L2, there
are three major discontinuities sets with dip direction/dip values
of 81°/41°, 171°/71° and 198°/60°. For
the tilt test results, the average peak friction angle (fp)
of the discontinuity surface for quartzite with Joint Roughness
Coefficient (JRC)
8-10 is 61°. Discontinuity planes of quartzite with JRC of
10-12 have an average peak friction angel (fp) value
of 73°, while phyllite with JRC 4-6 has an average peak friction
angle (fp) value of 56°. Based on kinematic
slope stability analysis, cut slope L1 is stable. Potential failure
for cut slope L2 is plane failure but the high friction angle
of the discontinuity surface will prevent failure. The Rock Mass
Rating (RMR)
obtained for quartzite is 77 and phyllite is 66 which both of
which are classify as good rock mass in class II.
Keywords: Kinematic slope stability
analysis; rock mass rating (RMR); tilt test
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*Pengarang untuk surat
menyurat; email: gdsbgoh@gmail.com