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    强震区沟道堰塞体失稳模式及其动力学特征

    周超 常鸣 徐璐 庞海松 余斌

    周超, 常鸣, 徐璐, 庞海松, 余斌, 2023. 强震区沟道堰塞体失稳模式及其动力学特征. 地球科学, 48(8): 3115-3126. doi: 10.3799/dqkx.2021.127
    引用本文: 周超, 常鸣, 徐璐, 庞海松, 余斌, 2023. 强震区沟道堰塞体失稳模式及其动力学特征. 地球科学, 48(8): 3115-3126. doi: 10.3799/dqkx.2021.127
    Zhou Chao, Chang Ming, Xu Lu, Pang Haisong, Yu Bin, 2023. Failure Modes and Dynamic Characteristics of the Landslide Dams in Strong Earthquake Area. Earth Science, 48(8): 3115-3126. doi: 10.3799/dqkx.2021.127
    Citation: Zhou Chao, Chang Ming, Xu Lu, Pang Haisong, Yu Bin, 2023. Failure Modes and Dynamic Characteristics of the Landslide Dams in Strong Earthquake Area. Earth Science, 48(8): 3115-3126. doi: 10.3799/dqkx.2021.127

    强震区沟道堰塞体失稳模式及其动力学特征

    doi: 10.3799/dqkx.2021.127
    基金项目: 

    国家重点研发计划 2018YFC1505402

    国家自然科学基金项目 42077245

    国家自然科学基金项目 41521002

    详细信息
      作者简介:

      周超(1996-),男,硕士生,主要从事工程地质与地质灾害防治方面研究. ORCID:0000-0001-8617-4340. E-mail:zc@stu.cdut.edu.cn

    • 中图分类号: P642.23

    Failure Modes and Dynamic Characteristics of the Landslide Dams in Strong Earthquake Area

    • 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.

       

    • 图  1  堰塞体失稳物理模型实验系统

      Fig.  1.  Sketch of the landslide dams experimental setup

      图  2  羊岭沟堰塞体分布图

      Fig.  2.  Distribution map of landslide dams in yangling gully

      图  3  实验土颗粒级配曲线

      Fig.  3.  The grain size distribution of the flume tests.

      图  4  漫顶破坏过程及示意图(D组)

      Fig.  4.  Experimental process of the landslide dam failure due to overtopping inexperment D

      图  5  漫顶破坏下的含水率及流量变化曲线图(D组)

      a. 含水率变化曲线;b. 溃口流量变化曲线

      Fig.  5.  Variation of water content and discharge of the landslide dam failure due to overtopping inexperment D

      图  6  滑面破坏过程及示意图(F组)

      Fig.  6.  Experimental process of the landslide dam failure due to sliding inexperment F

      图  7  滑面破坏下的含水率及流量变化曲线图(F组)

      a. 含水率变化曲线;b. 溃口流量变化曲线

      Fig.  7.  Variation of water content and discharge of the landslide dam failure due to sliding inexperment F

      图  8  管涌模式破坏过程及示意图(K组)

      Fig.  8.  Experimental process of the landslide dam failure due to piping inexperment K

      图  9  管涌破坏下的含水率及流量变化曲线图(K组)

      a. 含水率变化曲线;b. 溃口流量变化曲线

      Fig.  9.  Variation of water content and discharge of the landslide dam failure due to piping inexperment K

      图  10  漫顶破坏下堰塞体坡面颗粒受力分析图

      Fig.  10.  Stability analysis oflandslide dam due to overtopping

      图  11  滑面破坏下堰塞体稳定性分析图

      Fig.  11.  Stability analysis of landslide dam due to sliding

      表  1  堰塞体失稳模型实验参数表

      Table  1.   Experimental parameters of landslide dams

      试验编号 坝高(cm) 坝长(cm) D50(mm) CU 水槽坡度(°)
      A 20 80 1.5 13.3 5
      B 20 80 1.5 13.3 7
      C 20 80 1.5 13.3 9
      D 20 80 1.5 13.3 11
      E 20 80 1.5 13.3 13
      F 20 80 1.5 13.3 15
      G 20 80 1.5 13.3 17
      H 20 80 1.0 16.7 11
      I 20 80 2.5 23.4 11
      J 20 80 3.3 17.2 11
      K 20 80 4.3 23.6 11
      L 20 80 6.5 16.0 11
      下载: 导出CSV
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    • 收稿日期:  2021-05-13
    • 刊出日期:  2023-08-25

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