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中等倾角岩层顺向坡滑坡发育特征及形成机制分析

王玉川 郭其峰 周延国

王玉川, 郭其峰, 周延国. 中等倾角岩层顺向坡滑坡发育特征及形成机制分析[J]. 中国地质灾害与防治学报, 2021, 32(4): 17-23. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-03
引用本文: 王玉川, 郭其峰, 周延国. 中等倾角岩层顺向坡滑坡发育特征及形成机制分析[J]. 中国地质灾害与防治学报, 2021, 32(4): 17-23. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-03
Yuchuan WANG, Qifeng GUO, Yanguo ZHOU. Development characteristics and formation mechanism of the medium-dip bedding slopes:A case study of the landslide on the left bank of Tuodan reservoir dam[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 17-23. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-03
Citation: Yuchuan WANG, Qifeng GUO, Yanguo ZHOU. Development characteristics and formation mechanism of the medium-dip bedding slopes:A case study of the landslide on the left bank of Tuodan reservoir dam[J]. The Chinese Journal of Geological Hazard and Control, 2021, 32(4): 17-23. doi: 10.16031/j.cnki.issn.1003-8035.2021.04-03

中等倾角岩层顺向坡滑坡发育特征及形成机制分析

doi: 10.16031/j.cnki.issn.1003-8035.2021.04-03
详细信息
    作者简介:

    王玉川(1987-),男,河南信阳人,岩土工程专业,硕士,工程师,主要从事水利水电工程地质勘察及相关研究工作。E-mail:625049063@qq.com

  • 中图分类号: P642.22

Development characteristics and formation mechanism of the medium-dip bedding slopes:A case study of the landslide on the left bank of Tuodan reservoir dam

  • 摘要: 中等倾角岩层顺向坡,受坡体结构和岩体物理力学性质控制,多存在变形、崩塌、滑坡等工程地质问题,常常会诱发大规模的地质灾害。该类斜坡潜在滑动面不直接出露地表,一般具有变形机制复杂、隐蔽性强和危害大的特点,是滑坡领域关注与研究的重点。拖担水库大坝左岸为一古滑坡,在水库扩建开挖过程中,诱发古滑坡体复活。在分析古滑坡工程地质条件的基础上,结合地质勘察和变形监测结果,研究了其变形特征及形成机制。研究结果表明:①左岸古滑坡具有岩层倾角“上陡下缓”、滑体底部存在反倾坡内的剪切破碎带、滑床岩体产生弧状弯曲的特点;②古滑坡体为一基岩顺层滑坡,滑动模式为“滑移(弯曲)—剪断”型,其变形破坏过程包括三个阶段:弯曲隆起阶段、滑移剪出阶段和扰动变形阶段;③该类斜坡变形破坏后,坡体易沿“上陡下缓”的椅型软弱层面发生二次滑动,滑坡控制关键是对下部变形区的保护。
  • 图  1  左岸滑坡工程地质平面示意

    Figure  1.  Engineering geological map of the left bank

    图  2  左岸滑坡工程地质剖面图(F-F′剖面)

    Figure  2.  Engineering geological profile

    图  3  滑坡前缘下部的破碎带

    Figure  3.  Fracture zone below the landslide

    图  4  滑坡后缘变形区岩体特征

    Figure  4.  Characteristics of the back deformation zone

    图  5  滑坡前缘变形区岩体特征

    Figure  5.  Characteristics of the front deformation zone

    图  6  钻孔ZK03揭露后缘底滑面特征

    Figure  6.  Characteristics of the sliding-zone of the trailing edge

    图  7  钻孔ZK01揭露中部底滑面特征

    Figure  7.  Characteristics of the middle-sliding-zone

    图  8  滑坡前缘弧状弯曲岩体

    Figure  8.  Curved rock mass at the front edge

    图  9  左岸斜坡监测点分布图

    Figure  9.  Layout chart of monitoring

    图  10  左岸滑坡水平位移速率及降雨随时间关系曲线

    Figure  10.  Relation curves of horizontal displacement rate of landslide and rainfall with time

    图  11  左岸滑坡演化过程示意图

    Figure  11.  Evolution process of left bank deformation

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出版历程
  • 收稿日期:  2020-08-21
  • 修回日期:  2020-12-31
  • 网络出版日期:  2021-08-19
  • 刊出日期:  2021-08-25

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