摘要
大西岔沟地质环境复杂,节理、裂隙发育,在各支沟及主沟中,填埋了36万多方以碎石土为主的高、陡矿渣堆。这些矿渣以台阶状层叠堆放的形式填满整个沟谷,严重堵塞水路,并且矿渣堆的稳定性较差,透水性较好,再加上暴雨雨量大,汇流集中,大西岔沟已具备了泥石流灾害爆发的条件。结合洪峰流量对大西岔沟泥石流的启动条件进行分析,极容易发生泥石流。对于像大西岔沟的这种矿渣型泥石流,其主要形成水石流,具有固体物源补给方量大、产流区集中、容易启动、流通距离短和破坏性大的发育特征,其固体物质补给主要以冲、洪沟的侧蚀、揭底补给、渣堆失稳和坡面漫流冲刷补给为主。在此基础上,提出了以排导和固渣相结合的治理方案,即在沟谷中修建大量的排水沟,能第一时间排走洪水,同时对渣堆进行放坡处理,以增加渣堆的自稳能力。
The Daxicha gully has a complex geo - environment and have developed plenty of fissures, crannies and piled up more than 0.36 million m3 of slag. The slag is mainly constituted of reduced stones. The slag piled in the form of layered terraces, stopped the drainage channels of flood badly. It is instability, had well permeability. The abundance of storm rainfall in this region further makes the Daxieha gully become a gully of highly potential occurring debris flows. This paper further use the flood flux to analyze the start - up condition of debris flows. It is found that the debris flow can be easily induced in Daxicha gully. The slag debris flows would be mainly water and stone debris flows. They have the common characters of large and concentrated solid resources, start- up easy and shot travel distance, and serious destructive. The slag debris flows would be supplied with the slag that are corroded and washed from the side slopes and bottom of the gulley, instability slag piles and its surface. The paper suggests a scheme of combination the drainage and steady slag to prevent the occurrence of debris flows. A system of drainage ditches shall be built in the gully to direct out the rain water in time. The slope angles of the slag piles shall be re- duced to enhance their stability.
出处
《工程地质学报》
CSCD
北大核心
2009年第3期415-420,共6页
Journal of Engineering Geology
关键词
矿渣泥石流
颗粒分析
稳定性
启动条件
补给方式
防治方案
大西岔沟
Slag debris flow, Grading analysis, Stability, Condition of start - up, Supply model, Prevention scheme, Daxicha gully
