摘要
强震触发的大量崩塌滑坡所形成的松散固体物质堆积于泥石流沟道,容易形成天然堰塞体,在强降雨和上游流体的冲蚀下极易失稳形成溃决型泥石流.采用自制泥石流试验水槽,通过控制坝体颗粒组成和水动力条件,实施了12组堰塞体失稳模拟试验,获取了堰塞体的破坏过程、溃口流量和相关力学参数的演化特征.将堰塞体划分为漫顶破坏、滑面破坏、管涌破坏3种不同失稳模式,并结合堰塞体的颗粒组成结构分析了失稳机理及特征,通过动力学过程分析分别建立了不同失稳模式下的堰塞体稳定性判别式.研究成果对于溃决型泥石流防治工程的规划设计以及提高泥石流防灾减灾水平具有重要意义.
The loose solid materials generated by a large amount of landslides triggered by meizoseismal area fill up the valley or river,which is easy to form a landslide dam.It breaks out and forms outburst debris flow under heavy rainfall and the scouring action of rainfall-runoff.In this study,12 experiments were designed using the self-made flume to reproduce the failure process of landslide dams with different grain size distributions and hydrodynamic conditions.The failure process,breach discharge,and mechanical parameters are carried out.The landslide dams are divided into three instability modes:overtopping,sliding,and piping.The formation reasons of these three types of dam failure mode are analyzed combined with the grain size distributions of the landslide dams.Based on the dynamic characteristics,landslide dams′ stability under different failure modes is established The research results are of great significance for the planning and designing prevention and control projects of the dam-break debris flow and improving the level of debris flow disaster prevention and mitigation.
作者
周超
常鸣
徐璐
庞海松
余斌
Zhou Chao;Chang Ming;Xu Lu;Pang Haisong;Yu Bin(State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2023年第8期3115-3126,共12页
Earth Science
基金
国家重点研发计划(No.2018YFC1505402)
国家自然科学基金项目(Nos.42077245,41521002)。
关键词
堰塞体
失稳模式
动力学特征
临界条件
滑坡
landslide dam
failure mode
dynamic characteristic
critical condition
landslides.
