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Slope failure is one of hazard risks that can cause causalities, damage on properties and loss of lives especially to highway users. The study area is underlain by Semantan Formation, a rock formation of Triassic age comprising of various sedimentary rocks with some volcanic and igneous intrusions. The intrusions generated localized metamorphism activities forming various metamorphic and sedimentary rocks. These metamorphic and sedimentary rocks undergone several tectonic activities and as such, several sets of fractures developed due to quite a number of tectonic episodes. To determine the slope hazard risk, an investigation on the geotechnical and geology engineering characteristics on two typical slopes representing a sedimentary rock and a metamorphic rock along a road in Malaysia had been conducted. Discontinuity data collected from the field were analysed using DIPS software to distinguish the potential mode of slope failure. Results from the analysis shows that the highway stretch potential failure were wedge, planar and topple failure. Factor of safety for the slopes also had been analysed using laboratory analysis and SLIDE software. Results of the analysis from SLIDE software shows that majority of the slopes are stable. It also shows that the sedimentary rocks created different modes of failures compared to the metamorphic rocks. These are due to the irregularities of the geological deformations that causes the variations of the strength properties of each type of rocks. Precautionary measures need to be addressed differently based on the geological properties as it is the source of deterioration of strengths.
International Science and Engineering Application Symposium on Hazards
ISESH
Nur Anati Bt Azmi
Zainuddin MdYusoff
Muhammad Najmi