舟曲县三眼峪沟泥石流灾害治理工程分析

An Analysis of Treatment Project of Debris Flow Disaster in Sanyanyu Gully of Zhouqu County

2010年8月8日,舟曲县城北侧三眼峪沟和罗家峪沟暴发的特大山洪泥石流,给舟曲县城人民生命财产造成了巨大损失。基于现场调查、勘测,从流域地质环境条件,该次泥石流形成及活动特征,固体松散物质储存及补给方式,沟道冲淤变化及县城防灾等分析入手,阐述了拦挡工程在三眼峪沟泥石流治理中的作用,提出了以拦为主,拦排结合的治理观点;对拦挡坝工程类型进行分析选择,提出了采用抗冲击力强的中、高拦挡坝治理该沟泥石流,以确保足够的拦砂库容和工程的安全可靠性;依据各沟段泥砂补给及泥石流活动特征,分析拦挡坝构筑物形式及其功能和作用,系统部署了沟道拦挡坝工程。

The giant debris flow and flush flood that burst within Sanyanyu and Luojiayu gullies in the north side of Zhouqu County in August 8,2010 caused tremendous losses of the local people′s lives and properties.Based on field investigation and survey,important roles of blocking projects in the treatment of Sanyanyu Gully were expatiated and the view of dominated blocking projects in combination with drainage projects was proposed in terms of the analyses of geo-environmental conditions,formation and movement characteristics of the debris flow,storage and supply modes of loose materials,erosion and deposition in gully and disaster prevention of the county town,etc.To ensure enough storage capacity of sand hindrance and safe reliability,various types of blocking dams were analyzed and medium or high dams with high-impact strength were chosen to control debris flow disaster.According to the characteristics of supply and activity of debris flow in every gully section,forms,types and functions of the blocking dams were analyzed,and blocking projects were deployed systematically.