[1]白艺彤,等.泥石流造床运动的实验研究[J].山地学报,2021,(3):346-355.[doi:10.16089/j.cnki.1008-2786.000601]
 BAI Yitong,SONG Dongri,et al.Experimental Study on Paving Process of Debris Flow[J].Mountain Research,2021,(3):346-355.[doi:10.16089/j.cnki.1008-2786.000601]
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泥石流造床运动的实验研究
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2021年第3期
页码:
346-355
栏目:
山地灾害
出版日期:
2021-07-10

文章信息/Info

Title:
Experimental Study on Paving Process of Debris Flow
文章编号:
1008-2786-(2021)3-346-10
作者:
白艺彤1 2宋东日1 2*
1.中国科学院、水利部成都山地灾害与环境研究所,成都 610041; 2.中国科学院大学,北京 100392
Author(s):
BAI Yitong1 2 SONG Dongri1 2*
1. Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041,China; 2. University of Chinese Academy of Sciences, Beijing 100039, China
关键词:
泥石流 铺床作用 流动状态 流动速度 流动深度
分类号:
P642.23
DOI:
10.16089/j.cnki.1008-2786.000601
文献标志码:
A
摘要:
“泥石流铺床现象”常被用来定性地解释黏性泥石流(特指高固相含量)运动的减阻效应。目前,铺床现象对泥石流运动的影响研究仍处于定性阶段,定量化的机理研究非常匮乏。本研究设计了中尺度水槽模型实验,对泥石流铺床作用的动力学过程开展了系统观测。以云南蒋家沟泥石流堆积为材料,配置了40%、50%、55%三种固相浓度对比组; 实验观测了泥石流流动过程中运动特征,采集了基底正应力、剪应力、孔隙水压力及流动深度参数。实验结果表明:(1)稀性泥石流运动过程中存在微弱的铺床现象,铺床现象并非独属于黏性泥石流;(2)铺床所形成的残留层不一定是单阵泥石流贡献的,而可能是经连续过程逐步形成的。残留层的厚度随泥石流固相浓度的增加而增加。当后继泥石流流经残留层时,由于残留层的液化状态和较低的基底阻力,后继泥石流的作用力可以透过残留层传递至基底,残留层极易被后继泥石流体裹挟运动;(3)铺床过程显著改变了后继泥石流运动的边界条件,因而铺床作用能够提高泥石流流动速度、流动深度及相应的冲击力,且铺床效应随泥石流固相浓度升高而愈发显著。本研究不仅明确了泥石流造床运动的物理过程,并基于实测参数对铺床过程进行了机理阐述,填充了泥石流铺床研究的实验空白,对深入理解泥石流动力学具有重要意义。

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备注/Memo

备注/Memo:
收稿日期(Received date):2021-04-05; 改回日期(Accepted date):2021-06-10
基金项目(Foundation item):国家自然科学基金(42077256,51809261); 四川省科技计划资助项目(2020YJ0002)。[National Natural Science Foundation of China(42077256,51809261); Sichuan Science and Technology Program(2020YJ0002)]
作者简介(Biography):白艺彤(1996-),男,河北邯郸人,硕士研究生,主要研究方向:山地灾害防灾减灾工程。[BAI Yitong(1996-), male, born in Handan, Hebei province, M.Sc.candidate, research on debris flow hazard mitigation] E-mail: baiyitong18@mails.ucas.ac.cn.
*通讯作者(Corresponding author):宋东日(1987-),男,山东莱阳人,博士,研究员,主要研究方向:泥石流冲击动力学及工程防护。[SONG Dongri(1987-), male, born in Laiyang, Shandong province, Ph.D., professor, research on debris flow impact dynamics and engineering mitigation] E-mail: drsong@imde.ac.cn
更新日期/Last Update: 2021-05-30