An experimental study on the failure and mobilization of landslide dams induced by seepage

• Main Authors: Zhen-Lin Wang, 王禎麟
• Other Authors: Hsein-Ter Chou
• Format: Others
• Language: zh-TW
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/34020185317530651776

碩士 === 國立中央大學 === 土木工程研究所 === 92 === The characteristics of debris flow generated by the seepage failure of landslide dams are experimentally studied using an inclined slump with slope verying from 16° to 24° in this study. The failure of landslide dams is triggered by toe failure first, then followed by progressive head-cutting process. The head-cutting process induced by seepage can be divided to three phases. First, the dam slumped by seepage erosion. Second, the unsaturated soil became saturated by the mixing of upstream water flow. Third, the saturated slumped block moved as debris flow. The liquefaction process of the slumped block becomes more quickly when either the slope or the inflow increases. The experimental data of the characteristics of the head-cutting are analyzed by dimensional analysis. The dimensionless equation fits the relationship between the collapsed length and elapsed time well. The parabolic velocity profile be at fluid surface was observed in the experiments. Concentration of debris flow, is 0.25~0.47 for large grains and 0.31~0.47 for small grains.