Phenomenon of Slope Failure Occurrences along Gerik-Jeli Highway, Malaysia

Muhammad Barzani, Gasim and Mohd Ekhwan, Toriman and Hafizan, Juahir (2015) Phenomenon of Slope Failure Occurrences along Gerik-Jeli Highway, Malaysia. Journal of Applied Sciences, 15 (3). pp. 545-551. ISSN 1812-5654

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Abstract

The structural development of the late Palaeozoic metamorphic rocks in the study area has become weak since Cretaceous deformations due to presence of discontinuity planes. Because of long exposure, the climatic factors and weathering process have caused the crop out of these rocks and have experienced failure and movements. The aim of this study is to determine direction of slope failures of the rocks based on structural interpretation. The geology of study area is dominated by low-grade metamorphic rocks, consisting of interbedded phyllite, schist and quartzite. The dip direction and dip amount of the beddings and joints were measured during fieldwork, the result were plotted and interpreted on the Schmidt net in order to recognize and characterise their structural pattern. The weathered rock slope is characterised by high angle joints (74-80°) with dip directions between 330° and 20°. The rocks folded with northwest trending fold axes with dip direction and dip amount of the beddings are 235°/25°, 246°/23° and 250°/24° and other bedding planes are 351°/25°, 352°/24°, 354°/24°. The joint orientations are approximately perpendicular to the direction of the beddings. Some reverse faults (55°/15°, 60°/22°, 75°/35°, 85°/45° and 87°/28°) also cut across the bedding planes. Based on the discontinuity and landslide analyses, the failure occurred along the easterly dipping of the discontinuities, intersecting with variably oriented releasing joints that give rise to planar, toppling and wedge failures.

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