Sains Ma1aysiana 26(1): 19-31 (1997)                                                                                          Sains Bumi/

                                                                                                                                                                Earth Sciences

Cirian Halaju Seismos dan Ultrasonik Profil Luluhawa

Granit Km 39.9 Lebuhraya Kuala Lumpur-Karak

(Seismic velocity and ultrasonic characteristics of granite weathering

profile at Km 39.9 Kuala Lumpur-Karak Highway)

Umar Hamzah & Ibrahim Komoo

Jabatan Geologi

Universiti Kebangsaan Malaysia

43600 UKM Bangi Selangor D.E.

ABSTRAK

Satu survei untuk mencirikan sifat seismos dan ultrasonik profil luluhawa granit telah dilakukan di singkapan potongan jalan, cerun utara lebuhraya Kuala Lumpur-Karak pada lokaliti 39.9 km. Potongan berteres ini mempamirkan satu profil luluhawa lengkap iaitu mulai batuan gred 1 yang segar hingga ke tanah baki bergred VI. Di samping pengukuran seismos secara in situ, sampel batuan juga diambil untuk dibuat pengukuran halaju ultrasonik di makmal. Julat halaju yang mewakili gred dan indeks luluhawa bagi tanah dan batuan diperolehi daripada survei seismos in situ. Julat halaju trasonik dan modulus kenyal diperolehi hasil pengukuran di makmal.

ABSTRACT

A survey to characterize seismic and ultrasonic properties of a granite weathering profile have been carried out at a roadcut slope exposure along Kuala Lumpur-Karak highway at kilometres 39.9. The terraced cut slope shows a complete weathering profile beginning from fresh grade I rock to grade VI residual soil. Together with in situ seismic measurement, rock samples have been collected for ultrasonic tests in laboratory. The range of velocities representing grades and indices of weathered rocks and soils are determined from the in situ seismic surveys. The range of ultrasonic velocities and elastic moduli are obtained from the laboratory measurements.

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Ibrahim Komoo, Kadderi Md.Desa, Hamzah Mohammad, Abdul Ghani Rafek & Tan Boon Kong. 1991. Systematic approach in the characterisation of granitic weathering profiles in tropical terrain. Warta Geologi 17 (3): 105-109.

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