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甘肃舟曲垭豁口滑坡复活机理及成因探讨

窦晓东 张泽林

窦晓东, 张泽林. 2021: 甘肃舟曲垭豁口滑坡复活机理及成因探讨. 中国地质灾害与防治学报, 32(2): 9-18. doi: 10.16031/j.cnki.issn.1003-8035.2021.02.02
引用本文: 窦晓东, 张泽林. 2021: 甘肃舟曲垭豁口滑坡复活机理及成因探讨. 中国地质灾害与防治学报, 32(2): 9-18. doi: 10.16031/j.cnki.issn.1003-8035.2021.02.02
Xiaodong DOU, Zelin ZHANG. 2021: Mechanism and causal analysis on the Yahuokou landslide reactivation and causes (Zhouqu County, Gansu, China). The Chinese Journal of Geological Hazard and Control, 32(2): 9-18. doi: 10.16031/j.cnki.issn.1003-8035.2021.02.02
Citation: Xiaodong DOU, Zelin ZHANG. 2021: Mechanism and causal analysis on the Yahuokou landslide reactivation and causes (Zhouqu County, Gansu, China). The Chinese Journal of Geological Hazard and Control, 32(2): 9-18. doi: 10.16031/j.cnki.issn.1003-8035.2021.02.02

甘肃舟曲垭豁口滑坡复活机理及成因探讨

doi: 10.16031/j.cnki.issn.1003-8035.2021.02.02
基金项目: 国家自然科学青年基金(41902269)
详细信息
    作者简介:

    窦晓东(1984-),男,甘肃兰州人,学士,高级工程师,主要从事地质灾害研究。E-mail:297455517@qq.com

    通讯作者:

    张泽林(1984-),男,宁夏银川人,博士,讲师,硕士生导师,主要从事地质灾害研究。E-mail:249133236@qq.com

  • 中图分类号: P642.22

Mechanism and causal analysis on the Yahuokou landslide reactivation and causes (Zhouqu County, Gansu, China)

  • 摘要: 2019年7月19日18时许,甘肃舟曲县垭豁口滑坡复活,约3.92×106 m3的滑体顺坡而下,迅速流入岷江,堵塞河道,造成河道水位上升,江边公路中断,滑坡变形持续至8月中旬。基于野外勘察、遥感解译、钻孔勘探等方法获取了滑坡变形的基本特征,并开展了滑坡监测工作,并结合气象资料,探讨了该滑坡复活原因及启动机制。初步研究认为,该滑坡为降雨诱发。通过对滑坡变形历史进行梳理,结合滑带证据,滑坡复活机理可概括为:首先上部块体缓慢蠕变,降雨后发生塑性流滑;其次,因上部滑体堆积在滑坡中部,造成中部平台堆载,引发中部滑体变形;最终一滑而下,刮产连带下部滑体坠入河道。滑坡的上中下三部分滑体逐步被激活,最初缓慢变形,随后加速启动。滑坡变形模式为蠕滑—拉裂—流滑。对滑坡变形过程和机理的初步判断为滑坡灾害应急处置提供了科学依据。
  • 图  1  滑坡工程地质平面图

    Figure  1.  Landslide engineering geological plan figure

    图  2  垭豁口滑坡地貌景观

    Figure  2.  The panorama of Yahuokou landslide

    图  3  滑坡发生前后遥感影像图及工程地质剖面图

    Figure  3.  Remote sensing images and profile of the Yahuokou landslide

    图  4  2019.07.16—22日垭豁口滑坡变形的证据

    Figure  4.  Field evidences and damages caused by the landslide reactivation in 16—22 July 2019

    图  5  滑坡位移及降雨监测数据

    Figure  5.  Data of landslide displacement monitoring and regional rainfall

    图  6  2019.08.09—16日滑坡再次变形破坏的证据

    Figure  6.  Field evidences and damages by the landslide reactivation in 9—16 August 2019

    图  7  滑坡钻孔图

    Figure  7.  Evidences from the boreholes on the landslide

    图  8  滑坡滑动带特征

    Figure  8.  Evidence of landslide slip zone

    图  9  2019垭豁口滑坡变形特征

    Figure  9.  Field evidences and damages by the landslide reactivation in 2019

    图  10  滑坡变形过程及发生机理示意图

    Figure  10.  Schematic diagram of landslide event process and mechanism

    图  11  滑坡潜在影响范围

    Figure  11.  Schematic diagram of landslide potential impact area

    表  1  垭豁口滑坡变形破坏事件统计

    Table  1.   Approximate timeline of slope deformation and failure at the Yahuokou landslide

    时间轴垭豁口滑坡活动特征
    1989年滑坡首次滑动,堵塞河道形成堰塞湖
    2019-07-16斜坡中部可见20 cm裂缝,并且该部位30 m的下部土方松动。
    2019-07-17在斜坡下部的路面上可见22 cm的裂缝
    2019-07-18道路塌陷,滑体向前移动约20 m,堆积宽度约30 m。
    2019-07-19滑坡再次发生。在中间部分,滑体向前推动45 m,宽度为50 m。一条300 m长的公路在滑坡的前缘被毁。滑坡体积约
    3.92×106 m3,主体距岷江100 m。
    2019-07-20滑体又向下推动了10 m,道路周围的农田都发生变形。
    2019-07-21安装了滑坡监测仪器(图3)
    2019-08-09—12滑坡仍在变形。滑坡体处于连续滑动状态,前缘变形区向岷江扩展。
    2019-08-14—16滑坡前缘和中部裂隙增大、变宽,隆起高度增大,偶有碎块落入河中。山体滑坡的松散堆积物坠入河中堵塞宽度约4~8.5 m,部分河道窄至4.8 m。河道上下游水位差约0.4 m,河床略有抬升。
    下载: 导出CSV
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  • 收稿日期:  2020-04-03
  • 修回日期:  2020-04-17
  • 刊出日期:  2021-04-27

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