在建映(秀)汶(川)高速公路彻底关沟泥石流发育基本特征

Features of Debris Flow in Chediguangou under the Construction of Yingxiu-Wenchuan Highway

彻底关泥石流沟位于映秀镇上游约18 km处,在建映(秀)汶(川)高速公路途经该沟谷沟口段,设计以隧道形式穿过彻底关沟下部。据物源分布情况的综合调查分析,彻底关沟再次爆发泥石流的可能性和危害性均较大。本文通过系统分析工程区地貌条件、区域地质构造、地层岩性等因素揭示了泥石流形成条件,并对其重要的动力学参数进行了计算,最后对在建高速公路彻底关沟段进行了危险性评价。

Debris flow has a wide distribution in Chediguangou of Yingxiu-Wenchuan highway, which is 18km away from Yingxiu town. According to investigation, debris flow outbreak in Chendiguangou is more possible and fatal. While it happens, there is a seri- ous threat to nearby highway construction. The tunnel in this section of Yingxiu-Wenchuan highway is adopted. The paper systematically analyzes high and precipitous geomorphology, complex geologic structure, and stratum lithology, and reveals the reasons causing debris flow and hazards zone of construction.