Debris flow hazard mitigation: A simplified analytical model for the design of flexible barriers |
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| Institution: | 1. Key Laboratory of Mountain Hazards and Earth Surface Processes, Institute of Mountain Hazards & Environment, Chinese Academy of Sciences, 9#, Section 4, RenMinNanLu Avenue, Chengdu, Sichuan 610041, China;2. Department of Civil Engineering, Zhejiang University, Yuhangtang Road, Hangzhou 310058, China;3. Laboratory of Geotechnical Engineering, Department of Civil Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan;4. Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area of Hubei Province, College of Civil Engineering and Architecture, China Three Gorges University, 8#, Daxue Road, Xiling District, Yichang, Hubei 443002, China;1. Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;2. Center for Excellence in Tibetan Plateau Earth Sciences, Chinese Academy of Sciences, Beijing, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | A channelized debris flow is usually represented by a mixture of solid particles of various sizes and water flowing along a laterally confined inclined channel-shaped region to an unconfined area where it slows down and spreads out into a flat-shaped mass.The assessment of the mechanical behavior of protection structures upon impact with a flow, as well as the energy associated to it, are necessary for the proper design of such structures which, in densely populated areas, can prevent victims and limit the destructive effects of such a phenomenon.In the present paper, a simplified analysis of the mechanics of the impact of a debris flow is considered in order to estimate the forces that develop on the main structural elements of a deformable retention barrier.For this purpose, a simplified structural model of cable-like retention barriers has been developed – on basis of the equation of equilibrium of wires under large displacement conditions, – and the restraining forces, cable stresses and dissipated energies have been estimated.The results obtained from parametric analyses and full-scale tests have then been analysed and compared with the proposed model. |
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| Keywords: | Debris-flow Barriers Cable structure |
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