堰塞坝漫顶溃决过程溃口纵向下切与溯源

doi:10.13278/j.cnki.jjuese.20200023

吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (6): 1795-1803.doi: 10.13278/j.cnki.jjuese.20200023

• 地质工程与环境工程 • 上一篇

堰塞坝漫顶溃决过程溃口纵向下切与溯源

刘杰, 李丽华, 林跃水, 陈伟, 李晓明

攀枝花学院土木与建筑工程学院, 四川攀枝花 617000

收稿日期:2020-02-06 发布日期:2020-12-11
通讯作者: 陈伟(1966-),男,教授,主要从事土木工程,工业废弃物再利用等方面的研究,E-mail:pzhxycw@163.com E-mail:pzhxycw@163.com
作者简介:刘杰(1986-),男,讲师,博士,主要从事土石坝溃决、工程力学等方面的研究,E-mail:pzhjieliu@126.com
基金资助:
四川省高等学校重点实验室科研项目（SC_FQWLY-2019-Z-03）；2018年高校博士科研启动基金（035200078）；四川省教育厅项目（18ZB0339）

Depth Erosion and Tracing of Overtopping Landslide Dam Breach

Liu Jie, Li Lihua, Lin Yueshui, Chen Wei, Li Xiaoming

College of Civil and Building Engineering, Panzhihua College, Panzhihua 617000, Sichuan, China

Received:2020-02-06 Published:2020-12-11
Supported by:
Supported by University Key Laboratory Scientific Research Project of Sichuan Province(SC_FQWLY-2019-Z-03), University Doctoral Research Start-up Fund of 2018 (035200078) and Sichuan Education Department Project(18ZB0339)

摘要/Abstract

摘要： 为进一步了解堰塞坝溃坝过程，开展了9组水槽模型试验，对溃口纵向下切和溯源发展过程进行了系统分析，并讨论了上溯源点移动速度与溃口水深之间的关系。研究发现：非黏性堰塞坝溃坝过程中，冲刷面与底床的夹角时刻发生变化，上、下溯源点位置不固定但也不能完全发展到坝踵；上、下坡面坡度增大到最大值1：1.5时，下溯源点到下游坝趾的最大距离与坝体沿水流方向长度的比值（x_p^*/x_d^*，反映下溯源点最终相对位置）对应降低到最小值0.24和0.18；坝体相对尺寸从1减小到1/2时，x_p^*/x_d^*值从0.38增大到0.47。上溯源点的无量纲移动速度是不断变化的，在无量纲时刻为0.13时，其x，y分量分别达到峰值0.94和0.32；上溯源点处溃口水深出现时刻相对移动速度峰值点出现时刻有延迟，大概延迟0.04个无量纲时间。

关键词: 堰塞坝, 溃口发展, 纵向下切, 溯源, 漫顶

Abstract: In order to understand the failure process of landslide dam, nine sets of flume model experiments were conducted, the depth erosion and tracing of dam breach was further discussed, and the relationship of moving velocity of up-tracing point and breach depth was also analyzed. The results indicated that the angles between the erosion layer and the base bed were changing during the dam failure of non-cohesive landslide dam; The locations of up-tracing and down-tracing point were unfixed,but they could not move to the dam heel; When the slope of the upstream and downstream face slope increased to a maximum of 1:1.5, the ratio of the maximum distance from down-tracing point to downstream toe of the dam to the length of the dam along the flow direction (reflecting the final relative position of the down-tracing point) was correspondingly reduced to the minimum values of 0.24 and 0.18; When the relative scale of the dam reduced from 1 to 1/2, the value of x_p^*/x_d^* was correspondingly increased from 0.38 to 0.47. The dimensionless moving velocity of up-tracing point was constantly changing; There was a time delay of the peak breach water depth relative to the peak moving velocity, and the dimensionless delay time was about 0.04.

Key words: landslide dam, breach developing, depth erosion, tracing, overtopping

中图分类号:

P642.22

刘杰, 李丽华, 林跃水, 陈伟, 李晓明. 堰塞坝漫顶溃决过程溃口纵向下切与溯源[J]. 吉林大学学报(地球科学版), 2020, 50(6): 1795-1803.

Liu Jie, Li Lihua, Lin Yueshui, Chen Wei, Li Xiaoming. Depth Erosion and Tracing of Overtopping Landslide Dam Breach[J]. Journal of Jilin University(Earth Science Edition), 2020, 50(6): 1795-1803.

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堰塞坝漫顶溃决过程溃口纵向下切与溯源

Depth Erosion and Tracing of Overtopping Landslide Dam Breach

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[1]	蒋先刚, 吴雷. 不同初始含水量条件下的堰塞坝溃决机理[J]. 吉林大学学报(地球科学版), 2020, 50(1): 185-193.
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