雅砻江纤维沟泥石流特征及工程影响评价

纤维沟为雅砻江中游左岸发育的一级支沟,处于深切高山峡谷区,地形坡度陡,沟内岩体风化卸荷严重,崩滑物源沿沟堆积,加之较为丰富的暴雨,使该沟具备泥石流暴发的条件.若纤维沟暴发泥石流,将对沟口扇地卡杨二级公路以及拟建水电站大坝砂石混凝土加工场地产生直接影响.在阐述纤维沟泥石流发育历史的基础上,详细分析其汇水—物源区、流通区和堆积区的特征,对泥石流静动力学参数进行计算,并对其工程影响做出相应评价.

Characteristics and Engineering Influence Assessment of Debris Flow in Branch of Yalong River

Xianwei gully is one of primary tributaries in left bank of the middle reaches of Yalong River. This mountain range has many high peaks and deep canyons. The slope is so steep. The rock mass in the gully is seriously weathered and unloaded. There are lots of rockfall and landslide accumulated along the gully,combined with the heavy rain,which makes the gully have the conditions of debris flow outbreak. Breaking out the debris flow of the gully will have the direct impact on the Kayang second-class highway and the planned concrete production system of the hydropower station dam. On basis of elaborating the history of the debris flow generation,this paper analyzes the characteristics of catchment-source area,circulation area and pile area in detail,calculates the static and kinetic parameter about the debris flow,and makes the engineering influence assessment.