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三峡库区大型斜倾顺层滑坡失稳机理分析

王平 朱赛楠 张枝华 吴晓宾 杨柳 赵慧

王平, 朱赛楠, 张枝华, 吴晓宾, 杨柳, 赵慧. 三峡库区大型斜倾顺层滑坡失稳机理分析[J]. 中国地质灾害与防治学报, 2021, 32(4): 24-32. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-04
引用本文: 王平, 朱赛楠, 张枝华, 吴晓宾, 杨柳, 赵慧. 三峡库区大型斜倾顺层滑坡失稳机理分析[J]. 中国地质灾害与防治学报, 2021, 32(4): 24-32. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-04
Ping WANG, Sainan ZHU, Zhihua ZHANG, Xiaobin WU, Liu YANG, Hui ZHAO. Instability mechanism of massive oblique bedding rock landslide in the Three-Gorges Reservoir: A case study of the Longjing landslide in Shizhu County of Chongqing City[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 24-32. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-04
Citation: Ping WANG, Sainan ZHU, Zhihua ZHANG, Xiaobin WU, Liu YANG, Hui ZHAO. Instability mechanism of massive oblique bedding rock landslide in the Three-Gorges Reservoir: A case study of the Longjing landslide in Shizhu County of Chongqing City[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 24-32. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-04

三峡库区大型斜倾顺层滑坡失稳机理分析

doi: 10.16031/j.cnki.issn.1003-8035.2021.04-04
基金项目: 国家重点研发计划资助项目(2018YFC1505404);中国地质调查局地质调查项目(DD20190637);重庆市地勘局208水文地质工程地质队科创基金(208-KC-201905)
详细信息
    作者简介:

    王平:王 平(1988-),男,汉族,重庆巴南人,学士,工程师,主要从事地质灾害防治、地质环境调查评价工作。E-mail:276824228@qq.com

    通讯作者:

    朱赛楠(1984-),男,汉族,博士(后),主要从事地质灾害防治方面的研究工作。E-mail:6057817@qq.com

  • 中图分类号: P694

Instability mechanism of massive oblique bedding rock landslide in the Three-Gorges Reservoir: A case study of the Longjing landslide in Shizhu County of Chongqing City

  • 摘要: 长江三峡库区位于我国地形第二、三级阶梯过渡地带,地质环境复杂,斜倾顺层基岩滑坡较为发育。本文以重庆石柱龙井滑坡为例,详细分析了大型斜倾顺层基岩滑坡的变形特征、成因机理和破坏模式、并采用极限平衡法计算了滑坡在四种工况条件下的稳定性。结果表明:(1)龙井滑坡位于扬子准地台石柱向斜北西翼,体积约1.42×106 m3,主滑方向162°,前缘发育两个次级滑坡;(2)受地形地貌、地层构造、地下水和降雨等因素影响,滑坡目前处于蠕滑变形阶段,变形方式主要为拉张裂缝、剪切裂缝和局部鼓胀变形;(3)滑坡同时处于暴雨和前缘次级滑坡滑动条件下,稳定性为1.03,处于欠稳定状态,滑坡易沿软弱夹层发生整体滑动破坏。
  • 图  1  龙井滑坡无人机影像

    Figure  1.  UAV image of Longjing landslide

    图  2  龙井滑坡工程地质平面图

    Figure  2.  Engineering geological plan of Longjing landslide

    图  3  龙井滑坡工程地质剖面图(I–I′)

    Figure  3.  Engineering geological profile of Longjing landslide (I–I′)

    图  4  滑带泥化软弱夹层

    Figure  4.  Weak intercalated layer at sliding zone

    图  5  滑坡后部变形迹象

    Figure  5.  Deformation at the rear of landslide

    图  6  滑坡中部变形迹象

    Figure  6.  Deformation in the middle of landslide

    图  7  滑坡前部变形迹象

    Figure  7.  Deformation in the front of landslide

    图  8  传递系数法计算简图[19]

    Figure  8.  Calculation diagram of limit equilibrium method for landslide stability

    表  1  滑体物理力学参数表

    Table  1.   Physical and mechanical parameters of the sliding body

    滑体岩性天然重度
    /(kN·m−3)
    饱和重度
    /(kN·m−3)
    天然饱和
    c/kPaφ/(°)c/kPaφ/(°)
    粉质粘土
    夹碎石
    20.1020.4016.6022.6914.3019.94
    砂土17.5017.8011.7027.769.5022.80
    泥岩25.2025.3080034.3550033.17
    砂岩24.6024.7079036.6255035.39
    下载: 导出CSV

    表  2  滑带物理力学参数

    Table  2.   Physical and mechanical parameters of rockmass at the sliding zone

    滑带岩性天然(峰值)饱和(峰值)饱和(残余值)
    c/kPaφ/(°)c/kPaφ/(°)c/kPaφ/(°)
    泥化软弱夹层15.9010.6013.508.8611.106.36
    下载: 导出CSV

    表  3  稳定性系数计算成果表

    Table  3.   Calculation results of FOS

    工况滑面
    型态
    剪出口
    位置
    剩余
    下滑力
    /(kN·m−1
    稳定性
    系数
    稳定
    状态
    工况1折线悦黄公路内侧1035.301.20基本稳定
    工况21765.971.13基本稳定
    工况31328.891.16基本稳定
    工况42317.681.03欠稳定
    下载: 导出CSV
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  • 收稿日期:  2020-07-12
  • 修回日期:  2020-07-24
  • 网络出版日期:  2021-08-19
  • 刊出日期:  2021-08-25

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