Study on the Rainfall and Aftershock Threshold for Debris Flow of Post-earthquake
Study on the Rainfall and Aftershock Threshold for Debris Flow of Post-earthquake作者机构：Key laboratory of Mountain Hazards and Earth Surface Process Chinese Academy of Science Chengdu 610041 China Institute of Mountain Hazards and Environment Chinese Academy of Science Chengdu 610041 China
出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)
年 卷 期：2011年第8卷第5期
页 面：750-756页
核心收录：
学科分类：082802[工学-农业水土工程] 090707[农学-水土保持与荒漠化防治] 0907[农学-林学] 08[工学] 0828[工学-农业工程] 09[农学] 0837[工学-安全科学与工程] 0815[工学-水利工程]
基 金：supported by the National Technology Support Project (Grant No. 2011BAK12B03) the National Natural Science Foundation of China (Grant No. 40872181)
主 题：Earthquake Hydrological model Debris flow Rainfall threshold
摘 要：Due to the special condition of provenance and disaster environment after 5·12 Earthquake, the probability and conditions of the occurrence of gully debris flow change greatly after the event, which make it difficult to prevent disaster effectively. In this study the hydrological model of ground water table in loose sediment is established. According to infinite slope theory, the safety factor of deposits is defined as the ratio of resistance force to driving force. The starting condition of post-earthquake gully debris flow is clearly studied by analyzing the effects of rainfall intensity, seismic strength, slope gradient and mechanical properties on the balance of accumulation body. Then the formulas of rainfall and aftershock threshold for starting of gully debris flow are proposed, and an example is given to illustrate the effect of rainfall, aftershocks and their coupling action on a debris flow. The result shows the critical rainfall intensity decreases as the lateral seismic acceleration and channel gradient increases, while the critical intensity linearly increases as the friction angle increases.
维普期刊数据库
同方期刊数据库