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ABSTRACT ABSTRACT: GIS was used as one of the primary analysis tools during a rock fall hazard assessment and analyses of Chapmans Peak Drive, south of Cape Town. This paper describes the methodology used and the results of this work. Key methods used included 1) the development of a digital elevation model (DEM) used to delineate rock fall runout Zones; 2) rating Zones using an adapted version of the Oregon rock fall hazard rating system (RHRS) in order to determine the relative vulnerability of individual Zones to rock fall; 3) undertaking rock trajectory analyses to determine the distribution of kinetic energy for identified rock fall runout Zones; and 4) undertaking event tree analyses based on the synthesis of all data in order to establish Zones with the highest risk of fatalities. The results of this work shows that the vulnerability and risk varies considerably between Zones. The reasons for these differences are briefly elucidated. 1 INTRODUCTION Chapmans Peak Drive, located between Hout Bay and Noordhoek, on the Atlantic Ocean side of the Cape Peninsula, near Cape Town, South Africa (Fig. 1) is a favorite tourist route and is famous for its scenic beauty. The Drive, parts of which hug the near vertical mountainside of Chapmans Peak, is both a major tourist attraction and an important transportation link between the southern part of the Cape Peninsula and the city of Cape Town. At least 10 people have been killed and many more injured as a result of rock falls along parts of the drive, with the majority of the deaths or injuries having occurred within the last ten years. Subsequent to the death, and while the road was still closed, significant fires swept through the area, further destabilizing the slopes. In an effort to rehabilitate the
- Transportation (0.94)
- Government > Regional Government (0.46)
- Health, Safety, Environment & Sustainability > Safety > Operational safety (0.61)
- Management (0.46)
The Use of Geological Models For Foundations On Rock; Test Section of the Sea to Sky Highway Upgrade, B.C.
Schlotfeldt, P. (Gunsan National University) | Kim, J.G. (Korea Institute of Geoscience and Mineral Resources) | Lee, G.H. (Korean Gas Corporation) | Park, H.J. (Sejong University) | Um, J.G. (Pukyung National University)
ABSTRACT ABSTRACT: Construction of the 800 m long ‘Test Section’ for the upgrade of the Sea to Sky Highway (Highway 99), located near Lions Bay, B.C., was competed in August of 2004. The design and construction for this part of the highway improvement project ‘paved the way’ for the rest of the upgrade to Highway 99, which is an integral part of the infrastructure development for the 2010 Winter Olympics in Whistler. The upgrade included the construction of a number of major elevated structures and walls founded on rock. Limited space at the base of the slopes due to the existence of the CN railway line and very steep, high slopes above the roadway dictated that most structures had to be founded on or cantilevered over pre-existing, steeply inclined and potentially unstable rock slopes. Innovative foundation solutions were required during construction due to highly variable ground conditions. The purpose of this paper is to present aspects of the approach used to 1) identify and understand key geotechnical constraints at the site, 2) provide geotechnical input into the design of alternative foundations unsuitable for the steep unstable ground conditions, 3) design foundations on rock once the type and layout of structures had been finalized, and 4) design deep-seated anchorages required to counter overturning and seismic loads in structures and walls. 1 INTRODUCTION The Sea to Sky Highway (Hwy 99N) follows the east side of Howe Sound linking the cities of Vancouver, Squamish and Whistler, B.C. The Highway is currently undergoing major upgrade in preparation for the Vancouver 2010 Winter Olympics and Paralympics Games. Prior to the upgrade, the majority of the alignment comprised a two lane undivided highway. To accommodate the upgrade, many new structures will be required to cross creeks and drainage courses and to traverse steep ground below the highway.
- Leisure & Entertainment > Sports > Olympic Games (1.00)
- Transportation > Ground (0.69)