成昆铁路蒲坝小龙滩泥石流及其山前区古泥石流堆体“复活”剖析

Analysis of Debris Flow in the Xiaolongtan of Puba along ChengduKunming Railway and Relapse of Old Debris Flow Sediment in Foremountain Region

１９９５年６～７月，成昆铁路蒲坝小龙滩沟５次暴发泥石流。因山前区古泥石流堆体“复活”补给了大量物质，酿成了成昆铁路近年较大的一处泥石流灾害。从降雨、河槽侵蚀机理等方面进行了成因探讨，并提出了以疏导工程为主，防止泥石流改道，控制古堆体活动的整治对策。

In June and July, 1995, the debris flow broke out for five times in Puba's Xiaolongtan gully. Because a large of materials were given by the relapsing old debris flow sediment in foremountain region, ChengduKunming railway suffered a serious damage of the debris flow. The damage reasons are discussed depended on rainfall, river erosion mechanism and others. The major countermeasures were put forward to prevent debris flow detour, to control the activity of the old sediment and to dredge the debris flow.