雅砻江中游甲尔沟溃决型泥石流形成机理及危险度评价  

Formation Mechanism and Risk Assessment of the Jiaer-Gully Dam-Breaking Debris Flow, the Middle Reaches of the Yalong River

作　　者：曹水合 武运泊 刘哲[3] 毛硕[4] 杨敏[4] 

机构地区：[1]四川省地矿局九一五地质队,四川眉山620000 [2]重庆蜀通岩土工程有限公司,重庆410047 [3]山东省鲁南地质工程勘察院,山东济宁272100 [4]成都理工大学,四川成都610059

出　　处：《人民珠江》2015年第5期21-24,共4页Pearl River

摘　　要：通过现场勘查分析,总结了泥石流孕灾背景和甲尔沟泥石流的基本特征,分析了泥石流的形成机理,并在计算泥石流动力特征参数的基础上进行了泥石流危险度评价。研究表明:软硬岩互层的陡峻岸坡崩塌发育,为泥石流的提供了良好的孕灾环境;甲尔沟泥石流是在高山区强降雨条件下、堰塞坝浅层溢流侵蚀溃决并带动主沟两侧的崩滑堆积体拉槽下切形成的;甲尔沟属中度危险泥石流沟。By means of field investigation, disaster - breeding backgrounds and typical characteristics of the Jiaer - Gully Debris Flow are summarized, and the formation mechanism of the above debris flow is analyzed. Based on the dynamic characteristic parameters, the risk assessment of the debris flow is conducted. The studies showed that steep slopes with alternate hard and soft layers easily encounter collapse and landslide hazards, which provide good environments for the debris flow. Due to the heavy rain, the superficial layer of barrier dam was broken, and the Jiaergou debris flow formed above the barrier dam and grew into a larger scale one with the increasing gully bed erosion. The result of risk assessment is moderate risk.

关 键 词：溃决泥石流 形成机理 堰塞坝 危险度评价 甲尔沟 

分 类 号：TV144[水利工程—水力学及河流动力学]