狭陡型泥石流成灾特征与防治对策研究--以阿坝州金川县刘家沟泥石流为例  

Disaster characteristics and prevention measures of narrow‑steep debris flow—A case study of Liujia gully in Jinchuan county,Aba prefecture,Sichuan province

作　　者：崔华丽[1,2] 杨东旭 杨栋[1,2] 李元灵[1] 贾逸 吴波 CUI Huali;YANG Dongxu;YANG Dong;LI Yuanling;JIA Yi;WU Bo(Institute of Exploration Technology,CAGS,Chengdu Sichuan 611734,China;Chengdu Huajian Geological Engineering&Technology Co.,Ltd.,Chengdu Sichuan 611734,China)

机构地区：[1]中国地质科学院探矿工艺研究所,四川成都611734 [2]成都华建地质工程科技有限公司,四川成都611734

出　　处：《钻探工程》2022年第6期122-129,共8页Drilling Engineering

基　　金：国家科技重大专项“第二次青藏高原综合科学考察研究”(编号:2019QZKK0902)。

摘　　要：刘家沟位于四川省阿坝州金川县,是一条狭陡型高频泥石流沟,每年雨季,降雨激发泥石流灾害链。本文在野外调查和实地勘测的基础上,分析认为,受汶川MS8.0地震扰动,刘家沟形成流通区单位面积上松散固体物质达98.11×10^(4)m^(3),在409.8‰的平均纵坡降下,泥石流活动频率明显增强,泥石流沿程放大效应明显,最终形成了降雨+径流侵蚀-滑坡-堰塞体-堰塞体溃决-增大的泥石流-堵河形成堰塞湖-卡撒沟中、下游损害的灾害链。提出采用格宾石笼进行固坡护床,结合拦挡坝拦粗排细的作用,根据保护对象设置防护堤,优化排导槽与主河交汇条件的综合治理措施,可为小流域高频狭陡型泥石流灾害的治理提供参考。Liujia gully is a narrow‑steep and high‑frequency debris flow gully which is located in Jinchuan county,Aba Prefecture,Sichuan Province.Every raining season,rainfall will lead to debris flow disaster chains.In this paper,the author analyzes the characteristics and the environment of debris flow on the basis of field investigation and field survey.Debris flow parameters under different rainfall frequency are calculated by the rain flood method.The paper also analyzes the possibility of debris flow blocking the main river(Kasa gully)to provide the volume weight required.Many difficulties in treatment of debris flow in narrow‑steep gullies and are discussed with the case‑dependent measures.The Wenchuan earthquake induced a great mass of collapse and landslide with unit‑area loose solid materials in Liujia gully up to 98.11×10^(4)m^(3),and debris flow happened at higher frequency and amplifed volume at the average longitudinal slope of 409.8‰leading to the formation of the valley disaster chain consisting of rain+runoff erosionlandslide-landslide dam-weir burst-increasing debris flow-barrier lake-hazardous Kasa gullies.To solve the disaster,we suggest comprehensive treatment measures which include using Gabion stone cage to stabilize the slope and the gully,construction of retaining dams and drainage canals.They can provide reference for treatment of high‑frequency narrow steep debris flow disasters in small watersheds.

关 键 词：狭陡型泥石流 灾害链 堵河 格宾石笼 拦挡坝 刘家沟泥石流 

分 类 号：P313.2[天文地球—固体地球物理学]