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Huat L.T.,Mohd Asbi and Associates | Ali F.,National University of Malaysia
Electronic Journal of Geotechnical Engineering | Year: 2012

The concentration of infrastructure and building construction demands over the last two decades in Malaysia, has encouraged developments over new areas of challenging terrains and encroachments into existing, otherwise stable, highland areas resulting in incidences of geotechnical instability and catastrophe. Over the years, many researchers including the government have ventured into slope hazard assessment exercise with major aims, i.e. to reduce landslide disaster or to facilitate the slope preventive works by prioritization of expenditure. Numerous slope systems with multiple hazard analytical tools have been developed. The preliminary stage of all these study required detailed field / geomorphological mapping to collect important information (i.e., failure information, geological discontinuity, distress information and etc.), for the analysis stage. Due to the nature of the tropic condition in Malaysia, sometimes the mapping works were made impossible due to the existence of the thick vegetation. Therefore, in some circumstances, important information were missed out and not collected. With the advancement in technology of the current air borne laser survey, such limitation can be easily overcome. Hidden features i.e., failure scars, drainage basin, water ponding can be easily detected using air borne laser scanning. With the assistance from the air borne laser and application of GIS, some hydrological features including drainage path, potential water ponding, and saturated ground can also be determined. This information will facilitate the field surveillance teams to produce a better geomorphological map. This paper highlights the application of air borne laser works in-relation of producing a geomorphological map for a slope hazard assessment study. The advantages of air borne laser survey for the production of geomorphological map and how the air borne laser scanning works facilitate ground mapping works will also be detailed in this paper. © 2012 ejge. Source


Huat L.T.,Mohd Asbi and Associates | Ali F.,National University of Malaysia | Ibrahim A.S.,Slope Engineering Branch
Electronic Journal of Geotechnical Engineering | Year: 2012

Rainfall-induced landslides are very common in Malaysia especially during rainy seasons. Some of these landslides have resulted in not only extensive damage to properties but also loss of lives. An investigation has been carried out on one of the major landslides which occurred in Hulu Klang, known to be a landslideprone area. The study involved: (i) determination of mode and mechanism of failure based on information from site investigation, field data collections and eyewitness accounts, (ii) back analyses and (iii) identification of contributing factors. The failure can be classified as a deep-seated failure caused by existence of high pore-water pressure within the slope. The landslide may be attributed to a combination of factors such as: existence of loose soil from earth dumping on the slope which took place during the development of the area, prolonged rainfall during the months of October and November, widening of existing cracks and opening of new tension cracks due to prolonged creep and lastly damage of water pipe due to soil creep. © 2012 ejge. Source


Huat L.T.,Mohd Asbi and Associates | Ali F.,National University of Malaysia | Osman A.R.,Mohd Asbi and Associates
Electronic Journal of Geotechnical Engineering | Year: 2012

Landslides, mudslides, debris/mud flows are threats that endangering the safety of road users and highway assets especially when they traverse hilly and mountainous terrain. The North-South Expressway which was opened in 1994 is not spared of such threat; several landslides have been reported along the expressway despite the structured maintenance regime which was already in place. The majority of landslides along the expressway are caused by prolonged and intense rainfall, high ground water table and unfavorable geological discontinuities. To avert danger to motorists using the expressway as well as enhancing the maintenance regime, the owner of The North-South Expressway, PLUS, initiated a web based real time monitoring system (RTMS) on rain gauges along the North South Expressway in 2006 as part of the remote monitoring regime. Subsequently four years later, ground water monitoring system using piezometer was proposed to be included in the real time monitoring system. Several slopes have been selected to serve as a pilot study to identify critical rainfall and ground water level thresholds for early warning against slope instability. This paper highlights the web based RTMS and the study methodology in identifying these thresholds. © 2012 ejge. Source


Huat L.T.,Mohd Asbi and Associates | Ali F.,National University of Malaysia
Electronic Journal of Geotechnical Engineering | Year: 2012

A number of fatal landslides disasters have been reported in Ulu Klang starting with the tragedy of Highland Tower collapse in 1993, followed by several landslides adjacent to the Highland towers. These landslides have resulted in casualties and loss of lives, notwithstanding displacement of residents and extensive damage to properties. In view of formulating a medium term and long term measures towards an effective policy of inspection and monitoring of development in the Ulu Klang areas, Malaysia Public Works Department (JKR) Slope Engineering Branch have commissioned an area based landslide hazard assessment study at this landslide prone location. The proposed study covers an area of about 100km2 from Cheras to the North of Taman Melawati and the duration of the study is twelve months. Geographical Information System (GIS) is proposed to be used as the based machine for the production of landslide hazard map. LiDAR (Light detection and Ranging) survey was selected to produce the base map for the landslide hazard assessment. This paper highlights the landslide hazard assessment methodology and hazard map preparation using GIS application. © 2012 ejge. Source

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