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成昆铁路泸沽至西昌段位于安宁河大断裂带影响范围内,是地震的源地,也是泥石流集中暴发段。调查了影响研究段泥石流发育的6个因素;其中,地形地貌、降雨、不良地质是对泥石流的发育特征起决定性作用。通过大量调查获取了沿线泥石流暴发的最大雨强值;着重分析了不良地质的4种类型;流域面积与纵坡比、沟谷长度的关系。孕灾环境致使泥石流的类型和发育特征呈现串联形态分布、沟谷形态差异大、冲淤大、漫流能力强等特点。甄选了沿线9条典型泥石流沟进行重度和动力学参数计算,分析了形成机理以及发展趋势,对铁路的安全运行以及灾害的治理具有重要意义。
The Lugu-Xichang segment of Chengdu-Kunming Railway is located within the influence of the Great Anning River fault zone, which is the source of the earthquake and also the section of debris flow concentrated outbreak. Six factors influencing the development of debris flow in the research section were investigated. Among them, topography, rainfall and poor geology played a decisive role in the development of debris flow. Through a large number of surveys, the maximum rainfall intensity values of debris flow along the route were obtained. Four types of unfavorable geological conditions were analyzed emphatically. The relationship between basin area and vertical slope ratio and gully length was analyzed. The type and development characteristics of debris flow caused by pregnant environment have the characteristics of tandem configuration, big difference of valley morphology, large scour and silting, strong ability of diffusing. Nine typical debris flow ditches along the route were selected to calculate the severity and kinetic parameters. The formation mechanism and development trend were analyzed. It is of great significance to the safe operation of the railway and the management of the disaster.