###
工程科学与技术:2021,53(6):43-53
←前一篇   |   后一篇→
本文二维码信息
码上扫一扫!
基于物理模型试验的堰塞坝冲刷溃决过程研究
(1.四川省水利水电勘测设计研究院,四川 成都 610072;2.四川大学 水利水电学院,四川 成都 610065;3.四川大学 水力学与山区河流开发保护国家重点实验室,四川 成都 610065)
Erosion and Breach of Landslide Dam Based on Physical Model Tests
(1.Sichuan Water Resources and Hydroelectric Investigation & Design Inst., Chengdu 610072, China;2.College of Water Resource & Hydropower, Sichuan Univ., Chengdu 610065, China;3.State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ., Chengdu 610065, China)
摘要
图/表
参考文献
相似文献
本文已被:浏览 1721次   下载 660
投稿时间:2021-06-28    修订日期:2021-10-29
中文摘要: 中国是堰塞湖灾害最严重的国家之一,堰塞湖对上游淹没区和下游溃决演进区的人民生命财产安全构成巨大威胁,深入掌握堰塞坝冲刷溃决过程可为应急泄流道的设计和下游应急避险措施的制定等提供重要科技依据。以2018年金沙江白格滑坡堰塞湖为研究背景,采用室内物理模型试验的手段对堰塞坝冲刷溃决过程进行了系统研究。结果表明:堰塞坝冲刷溃决过程一般可分为4个阶段:过流孕育阶段、溯源侵蚀阶段、溃决发展阶段及河床再平衡阶段,其中:当溯源冲刷的陡坎追溯到上游坡顶,泄流槽进口断面在侵蚀作用下突然拓宽,泄流槽将连通形成底坡i>0的斜坡道,进而导致水流流速和流量突然增大,堰塞坝进入溃决快速发展的阶段。试验进一步探究了泄流槽开挖位置、开挖深度和宽度对溃决过程的影响。研究发现:当泄流槽开挖宽度不变,深度增大时,洪峰流量降低、峰现时间延迟,溃决流量过程线更为平坦;当泄流槽开挖深度不变,宽度增大时,峰现时间延迟。最后,对泄流槽的优化设计提出建议,泄流槽位置宜布置在坝顶高程最低的垭口,以减小洪峰流量,缩短溃决历时;开挖泄流槽时,应优先考虑加大泄流槽深度,最大限度地降低溃决时的堰塞湖水位。
Abstract:China is one of the countries with the most serious disasters of dammed lakes, where the dammed lakes pose a great threat to the safety of people’s lives and properties among the upstream inundated area and the downstream outburst flood routing area. A deep understanding of the scouring and breaching processes of landslide dam can provide important scientific and technological basis for the design of emergency discharge channel and the formulation of downstream emergency measures. According to the event of 2018 Baige landslide-dammed lake in the Jinsha River, the scouring and breaching processes of landslide dam were systematically studied by conducting the laboratory physical modeling tests. Test results showed that the erosion and breaching processes of landslide dam could be divided into four stages, i.e., flow incubation stage, retrogressive scouring stage, dam break development stage, and riverbed rebalancing stage. When the retrogressive erosion scarp was traced back to the upstream slope top and the inlet section of the discharge channel was eroded, the discharge channel would connect to form a ramp with the bottom slope i>0. Then the flow velocity and flow rate increase suddenly, and the dam break developed rapidly. The results also showed that when the excavation width of the chute remained constant and the depth increased, the peak flow would decrease, the peak time would be delayed and the process of the burst flow became smoother; when the depth of the chute was fixed, the peak time would be delayed as the width increased. Finally, according to the testing results, some suggestions were put forward for the optimal design of the discharge channel: The location of the discharge channel should be arranged in the pass with the lowest crest elevation to reduce the peak flow and shorten the breaching time; when excavating the spillway, priority should be given to increasing its depth to minimize the water level of the dammed lake during dam breaching.
文章编号:202100607     中图分类号:    文献标志码:
基金项目:国家自然科学基金区域创新发展联合基金项目(U20A20111);四川省青年科技创新研究团队项目(2020JDTD0006);四川省国际科技创新合作/港澳台科技创新合作项目(2021YFB0178)
作者简介:第一作者:谢忱(1996-),女,硕士生.研究方向:堰塞湖溃决过程及机理.E-mail:2364007190@qq.com;通信作者:周家文,E-mail:jwzhou@scu.edu.cn
引用文本:
谢忱,李从江,杨兴国,范刚,李海波,周家文.基于物理模型试验的堰塞坝冲刷溃决过程研究[J].工程科学与技术,2021,53(6):43-53.
XIE Chen,LI Congjiang,YANG Xingguo,FAN Gang,LI Haibo,ZHOU Jiawen.Erosion and Breach of Landslide Dam Based on Physical Model Tests[J].Advanced Engineering Sciences,2021,53(6):43-53.