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Regional deterministic characterization of fracture networks and its application to GIS-based rock fall risk assessment |
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| Authors: | M Sturzenegger M Sartori M Jaboyedoff D Stead |
| Institution: | aDepartment of Earth Sciences, Simon Fraser University, Burnaby, BC, Canada bDépartement de Géologie et Paléontologie, University of Geneva, Switzerland cQuanterra and Institut de Géomatique et d'Analyse des Risques, University of Lausanne, Switzerland |
| Abstract: | The study investigates the possibility to incorporate fracture intensity and block geometry as spatially continuous parameters in GIS-based systems. For this purpose, a deterministic method has been implemented to estimate block size (Bloc3D) and joint frequency (COLTOP). In addition to measuring the block size, the Bloc3D Method provides a 3D representation of the shape of individual blocks. These two methods were applied using field measurements (joint set orientation and spacing) performed over a large field area, in the Swiss Alps. This area is characterized by a complex geology, a number of different rock masses and varying degrees of metamorphism. The spatial variability of the parameters was evaluated with regard to lithology and major faults. A model incorporating these measurements and observations into a GIS system to assess the risk associated with rock falls is proposed. The analysis concludes with a discussion on the feasibility of such an application in regularly and irregularly jointed rock masses, with persistent and impersistent discontinuities. |
| Keywords: | Block size Block shape Joint frequency Risk assessment GIS Rock fall |
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