九绵高速工棚沟泥石流发育特征及危险性分析

Developmental Characteristics and Risk Analysis of Gongpeng Gully Debris Flow in Jiumian Highway

九绵高速沿线泥石流分布较广,以工棚沟为例,根据对沟域的野外调查,分析工棚沟的形成条件,认为工棚沟沟内物源量丰富、纵坡降大、丰沛的水源为泥石流的形成提供前提条件。通过研究工棚沟高位泥石流的发育特征,进而分析其演化历史及成灾类型。根据泥石流的动力学计算,对泥石流堆积范围进行预测。预测结果表明,该流域在遭受50年一遇泥石流时,将形成一定规模泥石流,泥石流对在建九绵高速及省道205的安全造成威胁。对工棚沟进行危险性分析,旨在为后续施工及治理提供参考。

The distribution of debris flow along the Jiumian Expressway is widely distributed.The formation of the shed is analyzed according to the field investigation of the gully area.It is concluded that the source of the Gongpeng gully is rich and the slope is large and abundant of the water source for the formation of debris flow to provide prerequisites.Through the study of the development characteristics of the high debris flow in Gongpeng gully,the evolution history and disaster type are analyzed.According to the dynamic calculation of debris flow,the accumulation range of debris flow is predicted.The results show that the basin will form a certain scale debris flow in the event of a 50-year debris flow,and the debris flow poses a threat to the safety of the S205 and high-speed roads.The risk analysis of the Gongpeng gully is designed to provide reference for subsequent construction and treatment.