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RISS 인기검색어
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- 저자 : ( Abd Rasid Jaapar ) (검색결과 4 건)
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Combining Total Geological History and Other Approaches in Resolving Construction Dispute
( Abd Rasid Jaapar ),( Afiq Farhan Abd Rahim ),( Mohd Farid Mohd Dali ),( Dharam Singh ),( Mohd Fadhil Jasmee ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
A dispute arose between Project Owner and Contractor over payment of the completed earthworks. The dispute was referred to arbitration on the volume of geomaterial had been excavated. Basically, it was an old issue on rock or no rock! The Contractor claimed the geomaterial is rock while the Project Owner claimed the geomaterial is not rock. A multidisciplinary geo-team, including engineering geologists, geotechnical engineers and GIS analysts was gathered to prepare the report. The approaches to the arbitration case used were the application of the total geological history, rock strength and SPT N-value to classify the ground while GIS was used to calculate the volume of geomaterial. The site-specific geological model is based on consideration of the regional and local geological and geomorphological history and of the current ground surface conditions. Results from boreholes were studied together with separate laboratory testing results of rock samples collected by the client during construction works. Extrapolation of rockhead was based on UCS ≥ 50 N60 (kPa). The volume calculation of rocks excavated was conducted using boreholes where rockhead had been identified together with as-built ground level (finish level). In this paper, the practical strategies involved in the total geology history approach as well as rock strength and SPT N-value are identified by describing its application for construction dispute.
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( Farid Dali ),( Abd Rasid Jaapar ),( Zakaria Mohamad ),( Afiq Farhan Abdul Rahim ),( Mohamad Faruq Syahmi Md Aripin ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Electrical Resistivity survey has been commonly used to investigate the anomalies of subsurface ground condition. Tomographic Pseudo section model presents the different range of resistivity value, indicating variation of soil layers, occurrence of groundwater, boulders or fractured bedrock zones. The complexity of subsurface geomaterials profile due to structural geology and weathering leads to potential inaccuracies in intrepetation without substantial geological input. Therefore, engineering geological model generated from subsurface electrical resistivity survey, combined with borehole and field observation input is very important to present the subsurface condition of the area. Thirteen (13) electrical resistivity survey lines were set up established at three (3) sites located at Selangor (Site A), Kuala Lumpur (Site B) and Negeri Sembilan (Site C). The objectives of these investigations are: to investigate potential geohazards near residential areas (Site A), to investigate the existence of subsurface boulders/rocks fragments that will affect the design and cost of geotechnical construction (Site B) and to investigate the incidence of displacement of water tank that exceeds allowable movement due to ground movement. A reliable geological interpretation presented in form of engineering geological model was utilized by geotechnical engineers/decision makers to solve construction and geohazards issues. It helps to visualize or summarize the outcome of any geological investigation tools in simplest way especially to non-geologist.
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( Afiq Farhan Abdul Rahim ),( Abd Rasid Jaapar ),( Muhammad Farid Mohamed Dali ),( Mustapha Atta ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Hilly areas to the east and north of Kuala Lumpur are known to be prone to landslide incidents as recorded in numerous historical cases involving life and property loss. Most historical incidence have been attributed to lack of proper planning and investigations, especially in terms of geology, engineering geology and geomorphological aspects. Therefore, this study aims to set up a good practice example in comprehensive engineering geological assessment - in this case, for a proposed urban highway at eastern Kuala Lumpur - along an engineering geologically challenging terrain. This study consists of the following components; terrain mapping (geomorphological study) and geohazards assessments along highway alignment to identify potential geotechnically challenging section, and geophysical survey with engineering geological assessment on specific identified sections to identify specific engineering geological issues. Lithology, structural geology and weathering profile are among factors identified contributing to issues in the study area which will affect construction and post-construction activities of the highway. The engineering geological assessment and model output from this study will be utilized for subsequent geotechnical works and stabilization design, which would address the challenges and any potential landslide in the region.
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( Mohamad Faruq Syahmi Md Aripin ),( Muhammad Farid Mohamed Dali ),( Muhammad Afifi Harun ),( Muhammad Fadhil Jasmee ),( Abd Rasid Jaapar ),( Thian Lai Goh ),( Rini Asnida Abdullah ),( Muhammad Afiq A 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The application of Terrestrial Laser Scanner (TLS) and photogrammetry technology becoming common now for rock slope stability assessment. This paper discussed the advantages and limitations of TLS and photogrammetry methods in Malaysian tropical terrains based on several case studies. Excessive weathering in tropical terrains greatly affected the data capturing process. The limitations’ effects can be reduced through various combination of techniques and understanding the limitations, such as occlusion, orientation bias, resolution and truncation. Site limitations that are affecting the resolution and accuracy of the data captured and coverage including height and steepness of the slope; limited working area and time for data acquisition phase; hindrances overlay the slope face and external noise are also being discussed. The TLS position is important to reduce noise and interference, whereby correct positioning of TLS may reduce the orientation bias and allow the laser to reach slope face without occlusion. The manual scanline survey is still needed to calibrate data collected by TLS. Scanline survey provided actual visual identification of discontinuities planes in order to differentiate with mechanical breaks that can be mistakenly inferred during point cloud data processing phase. Classification and analysis of point cloud data can be speed up with available processed scanline data. Scanline survey also enable geologist to acquire trace joint data (low persistency, low relief and small plane surface area) which is not the case for TLS. Combination of photogrammetry, TLS and Unmanned Automated Vehicle Light Detection and Radar (UAV LiDAR) is proposed for complicated site in tropical terrains.
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