Bulletin of the Geological Society of Malaysia, Volume 29, July 1991, pp. 207 – 245
Jabatan Geologi, Universiti Malaya, Kuala Lumpur
Abstrak: Survei ketakselanjaran telah dijalankan pada beberapa buah cerun potongan di lebuh raya Timur-Barat. Survei ini menggunakan teknik garis pengimbasan dan mengambilkira parameter jenis, jarak pisahan, orientasi, panjang, bukaan, bahan pengisi, kekasaran permukaan ketakselanjaran serta kehadiran air pada ketakselanjaran. Panjang ketakselanjaran dijelaskan secara lebih terperinci dengan menjelaskan kehadiran dan darjah keterusannya pada singkapan. Parameter blok dan saiz batuan juga diambilkira untuk menjelaskan kepadatan relatif ketakselanjaran pada jasad batuan.
Data daripada survei ketakselanjaran dapat digunakan untuk menilai Penanda Mutu Batuan (PMB). Hasilnya menunjukkan jasad batuan yang dikaji mempunyai nilai PMB sekitar 65% – 85%. Plot stereografi ketakselanjaran menunjukkan kebanyakan cerun memperlihatkan ragam kegagalan baji, satah, tebalikan, atau gabungan lebih daripada satu ragam kegagalan. Penggunaan konsep Ujian Markland dapat membantu mengecami satah ketakselanjaran genting dan meramalkan potensi kegagalan cerun batuan.
Abstract: Discontinuity survey has been conducted on rock slopes along the East-West Highway. This survey carried out scan line technique and taken into accounts parameters such as type, spacing, orientation, length, aperture, infilling, surface roughness of the discontinuity and the water conditions in the discontinuity plane. The length of discontinuity was described in more details by considering their exposure and degree of persistence in the outcrop. The shape and size of the rock blocks parameters were also considered in order to describe the relative density of the discontinuity in the rock mass.
The data obtained from the discontinuity survey were then used to evaluate the Rock Quality Designation (RQD). The results showed that the studied rock masses have a RQD value around 65% – 85%. The stereographic plots of the discontinuities revealed that most of the rock slopes has a potential to fail either in a mode of wedge, plane, and toppling failure, or a combination of more than one mode of failure. The Markland Test concept can be used to identify the critical discontinuity plane and eventually forecasting the potential of rock slope failure.
https://doi.org/10.7186/bgsm29199109
