[1]雨德聪ab,丁 攀c,杨志全ab*,等.初始含水率对黄土滑坡堰塞坝溃决影响研究[J].山地学报,2021,(3):367-377.[doi:10.16089/j.cnki.1008-2786.000603]
　YU Deconga,b,DING Panc,et al.Study on the Influence of Initial Water Content on the Breakout of Loess Landslide Barrier Dam[J].Mountain Research,2021,(3):367-377.[doi:10.16089/j.cnki.1008-2786.000603]
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初始含水率对黄土滑坡堰塞坝溃决影响研究()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2021年第3期
页码:
367-377
栏目:
山地灾害
出版日期:
2021-05-25

文章信息/Info

Title:
Study on the Influence of Initial Water Content on the Breakout of Loess Landslide Barrier Dam
文章编号:
1008-2786-(2021)3-367-11
作者:
雨德聪1a; 1b; 丁 攀1c; 杨志全1a; 1b*; 韩用顺2; 廖丽萍3
1.昆明理工大学 a.公共安全与应急管理学院; b.云南省高校高烈度地震山区交通走廊工程地质病害早期快速判识与防控重点实验室; c.国土资源工程学院,昆明 650093; 2.湖南科技大学 资源环境与安全工程学院,湖南 湘潭 411201; 3.广西大学 土木建筑工程学院,南宁 530004
Author(s):
YU Decong1a; b; DING Pan1c; YANG Zhiquan1a; b*; HAN Yongshun2;  LIAO Liping3
1. a. Faculty of Public Safety and Emergency Management; b. Key Laboratory of Early Rapid Identification, Prevention and Control of Geological Diseases in Traffic Corridor of High Intensity Earthquake Mountainous Area of Yunnan Province; c. Faculty of Land Resources Engineering, Kunming University of Science and Technology,Kunming, 650093, China; 2.College of Resources, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan,China; 3.College of Civil Engineering and Architecture, Guangxi University, Nanning 530004,China
关键词:
初始含水率;  水槽试验;  黄土;  堰塞坝溃决
Keywords:
initial water content;  flume tests;  loess;  dam-failure
分类号:
TU42; P642.2
DOI:
10.16089/j.cnki.1008-2786.000603
文献标志码:
A
摘要:
黄土区各类地质灾害伴随着极端降雨频繁发生,然而当前针对黄土滑坡堰塞坝溃决机制的相关研究成果较少,尤其是初始含水率、密实度、来水流量等参数对堰塞坝溃决的影响仍缺乏系统研究,其灾害机理尚不清晰。在影响堰塞坝溃决的众多因素中,初始含水率对黄土滑坡堰塞坝的稳定性有着重要影响,本文基于室内模型试验,初步探究了0%～25%含水率对黄土堰塞坝溃决的影响。试验表明:(1)不同初始含水率下的黄土滑坡堰塞坝溃决模式有四种,含水率为0%～18.75%时,堰塞坝溃决模式主要为漫顶溃决; 18.75%～21.25%时漫顶溃决与渗漏管涌溃决并存; 21.25%～23.75%时溃决模式表现为漫顶溃决与坝体失稳溃决并存; 23.75%～25%时表现为坝体失稳溃决。其中漫顶溃决过程具有三个典型阶段:溃口及冲沟发展阶段—溃口扩大阶段—溃口稳定阶段。(2)不同初始含水率下的黄土堰塞坝坝体侵蚀规律为:随着土体初始含水率的逐渐增大,水流对溃口底部的下切作用和溯源侵蚀能力逐渐减弱,牵引侵蚀作用增强。(3)对于漫顶溃决模式,溃决后的溃口宽深比随土体初始含水率的增大,呈现出先增大后减小的趋势,而发生坝体失稳溃决的堰塞坝溃口宽深比无显著规律。该研究成果可以为黄土堰塞坝溃决灾害的防灾减灾提供一定的理论参考。
Abstract:
Various geological disasters in the loess area frequently occur with extreme rainfall. However, there are few research results considering the effects of initial water content, compactness, incoming flowrate and other parameters on the breakout of loess landslide barrier dam, and the disaster mechanism is still not clear. The breaching process of natural dam is influenced by many factors, the initial water content has an important influence on the stability of loess landslide barrier dam. Based on indoor model tests, this paper preliminarily explored the influence of different water content in the range of 0%～25% on the breakout of loess barrier dam. The tests show that:(1)There were four breakout modes with different initial water content. When the water content was 0%～18.75%, the breakout mode was overtopping. At 18.75%～21.25%, overtopping and leakage piping breakout coexisted. From 21.25% to 23.75%, the breakout mode was the coexistence of overtopping and instability failure. When 23.75%～25%, the barrier dam body became unstable and broke out. Among them, the process of overtopping breakout had three typical stages: the development stage of breach and gully, the expansion stage of breach, and the stability stage of breach.(2)The erosion law of dam under different initial water content was as follows: with the gradual increase of initial water content of soil, the undercutting effect of water on the bottom of breach and the traceability erosion ability gradually weaken, while the traction erosion effect increases.(3)For the overtopping breakout mode, the width-depth ratio of the breach after breakout increased first and then decreased with the increase of the initial water content. However, the ratio of width to depth of barrier dam failure in which the dam body was unstable and broke out had no obvious law. The research results can provide a theoretical reference for the prevention and mitigation of loess barrier dam break disasters.

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备注/Memo

备注/Memo:
收稿日期(Received date):2020-06-15; 改回日期(Accepted date):2021-04-28
基金项目(Foundation item):云南省万人计划“青年拔尖人才”专项(YNWR-QNBJ-2018-321); 中国地质调查局西安地质调查中心科研项目([2018]01-21)。[Yunnan Ten Thousand Talents Plan Young & Elite Talents Project(YNWR-QNBJ-2018-321); Research Project of Xi'an Center of China Geological Survey([2018]01-21)]
作者简介(Biography):雨德聪(1994-),男,云南蒙自人,硕士研究生,主要研究方向:地质灾害起动机理。[YU Decong(1994-), male, born in Mengzi, Yunnan province, M.Sc. candidate, research on initiation mechanism of geological disasters] E-mail: ydc941025@163.com
*通讯作者(Corresponding author):杨志全(1983-),男,博士,教授,主要研究方向:地质灾害起动机理与水土保持。[YANG Zhiquan(1983-), male, Ph.D., professor, research on initiation mechanism of geological disaster and soil and water conservation] E-mail: yzq1983816@163.com
更新日期/Last Update: 2021-05-30