Abstract:In July 2010,there had being continuous raining for half month in Luanchuan County of Henan province,China.Yet heavy rain was falling on 24th,which resulted a regional debris flow happened.The whole 14 towns of Luanchuan County suffer loss that left 68 people dead,21 people missing and caused a total direct economic loss of 19.8 billion yuan(RMB).In order to give some reasonable suggestions to local government for debris flow prevention and treatment,methods of field investigation and engineering geological analysis were took to study the 31 disaster points of this regional debris flow event.The investigation found there are abundant debris types in this event,such as mudflow,debris flow and water-rock flow.In topography classification,debris flows are often slope type,but water-rock flows are almost gully type.Yet mining industry developed in Luanchuan county,so mine waste debris flow developed and typical and most of them broke out since tailings dam busted.Codes classification can't give specific suggestions to debris prevention and treatment as Luanchuan county debris broke in large area and types were rich,but start-up mode classification can.So based on previous research and project investigation analysis,these debris flow points were divided into seven types based on start-up model.They are dragging and busting joint action model,punching and slumping joint action model,impacting induced liquefying model,slope slumping model,slope washing and gully start-up joint action model,tailings busting model and combinational model,respectively.Moreover,detailed analysis of seven typical debris points,which belongs to the seven debris types,was conducted.%2010年7月河南省栾川县连续降雨达半月之久,24日又突降大暴雨,导致县境内暴发区域性泥石流(简称“7·24”暴雨泥石流),全县14个乡镇普遍受灾,死亡68人、失踪21人,直接经济损失约19.8亿元.为给当地政府提供合理的泥石流防治建议,对栾川县“7·24”暴雨泥石流中31个灾害点进行了野外调查并进行了工程地质分析.调查发现,此次栾川县暴雨泥石流类型丰富,泥流、泥石流及水石流均有发育；地貌上看,泥石流多属于坡面型,水石流基本上为沟谷型.同时,因栾川县采矿业发达,矿渣型泥石流发育十分典型,且大多为尾矿坝溃决所致.鉴于栾川“7·24”暴雨泥石流范围大、类型多的特点,若按规范分类则很难提供针对性的泥石流防治建议,而若按启动模式分类则能在防治建议中对症下药.因此结合前人研究成果和此次调查分析结论,按启动模式将栾川县泥石流划分为7种类型,分别为:沟道拖拽-溃决型、沟道冲切-崩滑型、冲击液化型、坡面崩滑型、坡面冲刷-沟道启动型、尾矿溃决型及其复合型.同时,对7种类型中典型泥石流点的启动模式进行了详细分析.
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