Experimental studies on fragmentation of rock falls on impact with rock surfaces |
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| Authors: | A Giacomini O Buzzi B Renard GP Giani |
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| Affiliation: | 1. Centre for Geotechnical and Materials Modelling, University of Newcastle, NSW, Australia;2. School of Engineering, University of Newcastle, NSW, Australia;3. University of Milano, Milano, Italy;1. Centre for Geotechnical and Materials Modelling, The University of Newcastle, Australia;2. Golder Associates (NZ) Limited, Christchurch, New Zealand;1. WSL Institute for Snow and Avalanche Research SLF, Flueelastrasse 11, CH-7260 Davos Dorf, Switzerland;2. ETH Swiss Federal Institute of Technology, Zurich Wolfgang-Pauli-Str. 15, CH-8093 Zurich, Switzerland;3. Geobrugg AG – Geohazard Solutions, Aachstrasse 11, CH-8590 Romanshorn, Switzerland;1. State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China;2. Key Laboratory of Geotechnical and Underground Engineering (Tongji University), Ministry of Education, Shanghai 200092, China;3. Department of Earth and Environmental Sciences, Università degli Studi di Milano Bicocca, Piazza della Scienza 4, 20126 Milano, Italy;1. Faculty of Engineering, China University of Geosciences, Wuhan, China;2. China Three Gorges Corporation, Beijing, China;3. School of Civil, Environmental and Mining Engineering, University of Adelaide, Australia |
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| Abstract: | Rock fall is a common natural hazard causing significant damage to infrastructure and loss of life. Rock fragmentation is frequently observed during rock fall events and several authors have raised issues related to the impact of fragments on the protection structure. However, this phenomenon is not accounted for when designing the protection barriers. The paper presents the results of 20 rockfall tests performed in a quarry in Italy to provide new insight into the fragmentation phenomenon, especially in the case of foliated materials. The results have shown that the impacting angle plays a key role in the fragmentation of foliated rocks whereas the effect of the impacting energy tends to be of second order. No threshold in impacting energy could be defined to explain what triggers the fragmentation. It has been noticed that the proportion of impacting energy dissipated during fragmentation is relatively constant and depends on the choice of the normal restitution coefficient. |
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