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| A rapid evaluation method of landslide dam stability#br# |
| SHAN Yibo1，CHEN Shengshui1，2，ZHONG Qiming1，2#br# |
(1. Nanjing Hydraulic Research Institute，Nanjing，Jiangsu 210029，China；2. Key Laboratory of Earth-Dam Failure Mechanism and Safety Control Techniques，Ministry of Water Resources，Nanjing，Jiangsu 210029，China)
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Abstract It is of significant importance to evaluate the stability of landslide dams accurately and rapidly for emergency rescue. At present，however，all the rapid evaluation methods cannot evaluate quantitatively the influence of the grain composition of landslide dam deposits on the dam stability. In this study，a database of landslide dams is established based on 1434 unstable and stable cases around the world，and then a set of new rapid evaluation method is proposed by using the logistic regression methodology. The method can consider the morphological characteristics and grain composition of the landslide dam，as well as the hydrodynamic conditions of the dammed lake. Further，based on the available information of material composition of the landslide dam deposits，a detailed evaluation method is developed by 27 unstable and stable cases with the grain-size distribution curve，and the simplified evaluation method is proposed by 115 unstable and stable cases with the description of material composition. Subsequently，15 cases with the grain-size distribution curve and 67 cases with the description of material composition are reselected to verify the new evaluation method and to compare it with the similar evaluation methods domestic and overseas. The calculated results show that the absolute accuracy rate，conservation rate and false rate of the detailed evaluation method are 86.67%，93.33% and 6.67%，respectively，and the absolute accuracy rate，conservation rate and false rate of the simplified evaluation method are 88.06%，94.03%，and 5.97%，respectively. In addition，the comparisons with other evaluation methods prove the reliability and superiority of the new evaluation method.
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2020, Vol. 39 
