四川康定江咀沟泥石流动力学特征和危险性评价

Dynamic Characterstics of Jiangzui Valley Debris Flow and Hazard Risk Assessment in Kangding County,Sichuan Province

本文在实地调查江咀沟地质背景、形成区物源特征、流通区沟道特征及堆积区的结构特征和成份特征基础上,系统分析了江咀沟泥石流的动力学特征、输砂量以及危险性。研究表明,受瓜达沟断层和昌昌断层破碎带、岩性、岩体结构、新构造运动、地形及人类工程活动的综合影响,沟内物源丰富,流通区狭窄,沟道堵塞较为严重,为高度危险泥石流沟,50年一遇洪水泥石流输砂量为16.78×104m3,对下游水电库区淤积有一定影响,但程度有限。

Based on the survey of the Jiangzui valley, including its geological background, material factors of forming region, characteristics of circulation area, and structural characteristics and composition features of pile area, the article systematically analyzes the debris flow dynamics feature, soil mass and the risk. The research shows that in the comprehensive influence of fracture zone, lithology, rock mass structure, neotecetonics, terrain and human engineering activities of Guada valley fault and Changchang fault, Jiangzui Valley has abundant materials, its circulation area is narrow, and channel is blocked seriously. It makes the Jiangzui Valley a high-risk debris flow valley. The soil mass is 16.78× 10^4m^3 in the condition of the debris flow happens once in 50 years, it has a certain but limited influence on the downstream hydroelectric station.