5·12地震后旋地泥石流形成条件及运动特征

Formation conditions and dynamics characteristics of the Xuandi debris flow after the 5·12 Earthquake

对四川省平武县旋地泥石流沟流域进行了现场调查,分析了5·12地震后旋地泥石流沟形成泥石流的基本条件(物源和水源条件)。根据野外实地考察,确定旋地泥石流为稀性泥石流,重度为1.724 t/m3。对泥石流沟动储量和易发条件进行评价,得出在暴雨、震动等不利工况下易暴发泥石流。在此基础上,提出了修建拦挡坝和排导槽等措施,以保护沟口居民生命财产安全。

According to the on-site investigation of the valley and the Xuandi in Pingwu Country of Sichuan Province,we analyzed the basic conditions of the Xuandi debris flow gully after the Wenchuan May 12th Earthquak.Based on the field investigation,the property of the gully is determined as diluted debris flow,and the density is 1.724 t/m^3.Trough the evaluation of the dynamic reserves and the conditions of the debris flow,we get the result that in the heavy rain,vibration and other adverse conditions such as debris flows would broke out easily.On this basis,we put forward the engineering measures adopted including has obstruct and the platoon leads.So as to protect the lives and property security of the debris flow gully of residents.