Abstract
The study area is located in the northwestern part of Kota Belud, Sabah and underlain by Late Eocene-late Early Miocene of the Crocker formation. The objectives of this study are to determine the mode of failures, factors of safety and to propose slope designs. Engineering geological mapping, kinematic analysis, new approach of adjustment factor, dry density analysis, stereographic measurement, kinetic analysis and prescriptive measures were used to produce geological map and described rock mass characteristics, to determine the mode of failure and optimum slope angle, the most critical mode of failure, unit weight of the rock, wedge angle, factor of safety and slope protection and stabilization measures, respectively. Results of this study shows that the mode of failures are wedge failure, the factors of safety ranges from 1.93 to 4.43 which generally considered stable and the proposed slope design are flattening the slope angle between 31o-45o, installation of the wire mesh, rock trap ditch and spot rock bolting.
Highlights
Slope failure is a main issue in lives and property loss all around the world
Occurrences of the more than a cubic meter (m3) falling rock block at the bottom of rock cut slope in Kampung Kuala Abai road have become an issue for this study
The grey shale unit has represented by rhythmic interbedded of thick grey shale and thin very fine sandstone, parallel to wavy laminated, less well developed sole marks, occasional trace fossil (Nereites association) and common slumps deposition
Summary
Slope failure is a main issue in lives and property loss all around the world. Modification or creating of artificial slope by improper slope cutting and design are sometimes contributed to the formation of slope failures. Occurrences of the more than a cubic meter (m3) falling rock block at the bottom of rock cut slope in Kampung Kuala Abai road have become an issue for this study These rock blocks are large enough in damaging engineering structures or properties, causing injury and even death. The study area is underlain by Crocker Formation of Late Eocene – late Early Miocene ages which have been experienced complex tectonic history and unique geological structures (Figure 1) This formation is a turbidite deposits that consists of interbedded sandstone, siltstone and shale units. The grey shale unit has represented by rhythmic interbedded of thick grey shale and thin very fine sandstone, parallel to wavy laminated, less well developed sole marks, occasional trace fossil (Nereites association) and common slumps deposition. The objectives of this study are to determine the mode of failures, factors of safety and to propose slope designs
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