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金沙江上游沃达滑坡发育特征与堵江危险性分析

吴瑞安 马海善 张俊才 杨志华 李雪 倪嘉伟 钟宁

吴瑞安, 马海善, 张俊才, 杨志华, 李雪, 倪嘉伟, 钟宁. 金沙江上游沃达滑坡发育特征与堵江危险性分析[J]. 水文地质工程地质, 2021, 48(5): 120-128. doi: 10.16030/j.cnki.issn.1000-3665.202104036
引用本文: 吴瑞安, 马海善, 张俊才, 杨志华, 李雪, 倪嘉伟, 钟宁. 金沙江上游沃达滑坡发育特征与堵江危险性分析[J]. 水文地质工程地质, 2021, 48(5): 120-128. doi: 10.16030/j.cnki.issn.1000-3665.202104036
WU Rui’an, MA Haishan, ZHANG Juncai, YANG Zhihua, LI Xue, NI Jiawei, ZHONG Ning. Developmental characteristics and damming river risk of the Woda landslide in the upper reaches of the Jinshajiang River[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 120-128. doi: 10.16030/j.cnki.issn.1000-3665.202104036
Citation: WU Rui’an, MA Haishan, ZHANG Juncai, YANG Zhihua, LI Xue, NI Jiawei, ZHONG Ning. Developmental characteristics and damming river risk of the Woda landslide in the upper reaches of the Jinshajiang River[J]. Hydrogeology & Engineering Geology, 2021, 48(5): 120-128. doi: 10.16030/j.cnki.issn.1000-3665.202104036

金沙江上游沃达滑坡发育特征与堵江危险性分析

doi: 10.16030/j.cnki.issn.1000-3665.202104036
基金项目: 国家自然科学基金项目(41731287;41941017);中国地质调查局地质调查项目(DD20190319;DZLXJK202009)
详细信息
    作者简介:

    吴瑞安(1991-),男,博士,助理研究员,主要从事工程地质与地质灾害方面的研究。E-mail:wuruian1991@126.com

    通讯作者:

    马海善(1988-),男,工程师,主要从事地质灾害调查评价。E-mail:1060956420@qq.com

  • 中图分类号: P642.2

Developmental characteristics and damming river risk of the Woda landslide in the upper reaches of the Jinshajiang River

  • 摘要: 金沙江上游沃达滑坡自1985年开始出现变形,现今地表宏观变形迹象明显,存在进一步失稳滑动和堵江的风险。采用遥感解译、地面调查、工程地质钻探和综合监测等方法,分析了沃达滑坡空间结构和复活变形特征,阐明了滑坡潜在复活失稳模式,并采用经验公式计算分析了滑坡堵江危险性。结果表明:沃达滑坡为一特大型滑坡,体积约28.81×106 m3,推测其在晚更新世之前发生过大规模滑动;滑坡堆积体目前整体处于蠕滑变形阶段,局部处于加速变形阶段;复活变形范围主要集中在中前部,且呈现向后渐进变形破坏特征,复活区右侧变形比左侧强烈。滑坡存在浅层和深层两级滑面,平均埋深分别约15.0,25.5 m,相应地可能出现两种潜在失稳模式:滑坡强变形区沿浅层滑带滑动失稳时,形成的堵江堰塞坝高度约87.2 m;滑坡整体沿深层滑带滑动失稳时,形成的堵江堰塞坝高度约129.2 m。沃达滑坡存在形成滑坡-堵江-溃决-洪水链式灾害的危险性,建议进一步加强滑坡监测,针对性开展排水、加固等防治工程。
  • 图  1  研究区地质背景图

    1—三叠系上统拉纳山组片岩、板岩、页岩;2—三叠系上统图姆沟组结晶灰岩、砂岩;3—三叠系上统曲嘎寺组结晶灰岩;4—三叠系上统二长花岗岩;5—三叠系上统闪长岩;6—三叠系上统辉绿岩;7—三叠系上统超基性岩岩块;8—二叠-三叠系下统岗托岩群绢云石英片岩、二云片岩;9—二叠系玄武岩岩块;10—志留系碳酸盐岩块;11—闪长岩脉;12—地层界线;13—逆断层;14—地层产状;15—角岩化;16—沃达滑坡

    Figure  1.  Geological background map of the study area

    图  2  沃达滑坡工程地质平面图

    Figure  2.  Engineering geological planar graph of the Woda landslide

    图  3  沃达滑坡工程地质剖面(a-a’)图

    Figure  3.  Engineering geological profile (a-a’) of the Woda landslide

    图  4  沃达滑坡复活变形特征图

    Figure  4.  Reactivation deformation characteristics of the Woda landslide

    图  5  沃达滑坡GNSS地表水平累积位移监测曲线

    Figure  5.  GNSS surface horizontal cumulative displacement monitoring curve of the Woda landslide

    图  6  沃达滑坡钻孔深部测斜位移曲线

    Figure  6.  Displacement curve of deep borehole survey of the Woda landslide

    图  7  滑坡堵江堰塞坝纵剖面示意图[18]

    Figure  7.  Cross section of a landslide dam

    表  1  完全堵江最小土石方量

    Table  1.   The minimum sliding-mass of complete landslide-damming

    剖面Hr/mBr/mφs/(°)Vmin/(104 m3V1/(106 m3V2/(106 m3
    a-a’15942512.56.5028.81
    b-b’15762510.1
    c-c’151122514.9
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-04-15
  • 修回日期:  2021-06-14
  • 网络出版日期:  2021-09-09
  • 刊出日期:  2021-09-10

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