Post-analysis simulation of the collapse of an open sabo dam of steel pipes subjected to boulder laden debris flow |
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| Institution: | 1. Department of Civil Engineering, National Defense Academy, Japan;2. Université Grenoble Alpes, Laboratoire 3SR (sols, Solides, Structures, Risques), UMR 5521, Domaine Universitaire, BP53, France;1. Department of Civil Engineering, College of Engineering & Applied Sciences, Stony Brook University, Stony Brook, NY, USA;2. Department of Civil and Environmental Engineering, Hanyang University, Seoul, South Korea;1. Water Engineering Department, Shiraz University, Shiraz, Iran;2. Centre for Infrastructure Engineering, School of Engineering, Western Sydney University, Penrith, NSW, Australia;1. Istanbul Technical University, Department of Civil Engineering, Maslak, Istanbul, 34469, Turkey;2. Department of Civil Engineering, Ahar Branch Islamic Azad University, Ahar, Iran;3. Division of Hydraulics, Department of Civil Engineering, University of Tabriz, Tabriz, Iran;1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China;3. School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China;4. Tsinghua University, Beijing 100084, China;1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (SKL-WAC), Beijing 100048, China;2. China Institute of Water Resources and Hydropower Research (IWHR), Beijing 100048, China;3. Institute of Disaster Prevention, Beijing 101601, China |
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| Abstract: | The objective of the proposed method is to utilize a site investigation of a debris flow disaster and verify a real scale analysis to evaluate the impulsive load on an open sabo dam. The Nagiso debris flow disaster which occurred in Nagano in 2014, where damage caused by Typhoon Neogri was studied. The verification result of the site investigation demonstrated the weak components of the open Sabo dam experienced damage owing to the debris flow. A discrete element method is normally applied to a solid body to calculate an interaction function force with respect to the contact point between boulders and the dam. The numerical method initially concatenates elements that model the open Sabo dam. Moreover, the stiffness coefficient of flanges and coupling joints between pipes was expressed to utilize the sectional partition method to determine the structural characteristics. The method was improved to separate from the connecting elements beyond the boundary conditions. The debris flow model uses a water flow distribution model, and the debris flow flowed from 200 m upstream of the open sabo dam. Accordingly, the proposed method was examined to verify the primary cause of damage to the open sabo dam and used to reproduce the circumstances that evaluated the impulsive load occurrence mechanism in the case of a real disaster. In addition, the coupling joints between the hollow steel pipes utilized a ‘reproduction analysis’ for a real sabo dam and a ‘reinforced analysis’ for a reinforced sabo dam were applied to assess the weak point of the dam. |
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| Keywords: | Open sabo dam Site investigation Damage verification Discrete element method |
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