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缓倾红层地区岩质崩塌基本特征及成因机理初步分析

刘文 余天彬 王猛 宋班 黄细超 董继红 江煜 孙渝江

刘文,余天彬,王猛,等. 缓倾红层地区岩质崩塌基本特征及成因机理初步分析−以四川洪雅铁匠湾崩塌为例[J]. 中国地质灾害与防治学报,2023,34(5): 54-63 doi: 10.16031/j.cnki.issn.1003-8035.202206027
引用本文: 刘文,余天彬,王猛,等. 缓倾红层地区岩质崩塌基本特征及成因机理初步分析−以四川洪雅铁匠湾崩塌为例[J]. 中国地质灾害与防治学报,2023,34(5): 54-63 doi: 10.16031/j.cnki.issn.1003-8035.202206027
LIU Wen,YU Tianbin,WANG Meng,et al. Preliminary analysis on basic characteristics and mechanism of rockfalls in layered red rocks with gentle dip angle: A case study of the Tiejiangwan rockfall in Hongya County, Sichuan Province[J]. The Chinese Journal of Geological Hazard and Control,2023,34(5): 54-63 doi: 10.16031/j.cnki.issn.1003-8035.202206027
Citation: LIU Wen,YU Tianbin,WANG Meng,et al. Preliminary analysis on basic characteristics and mechanism of rockfalls in layered red rocks with gentle dip angle: A case study of the Tiejiangwan rockfall in Hongya County, Sichuan Province[J]. The Chinese Journal of Geological Hazard and Control,2023,34(5): 54-63 doi: 10.16031/j.cnki.issn.1003-8035.202206027

缓倾红层地区岩质崩塌基本特征及成因机理初步分析

doi: 10.16031/j.cnki.issn.1003-8035.202206027
基金项目: 四川省地质灾害隐患遥感识别监测及高分遥感应用服务项目(N5100012022001470)
详细信息
    作者简介:

    刘文:刘 文(1990-),男,地质工程专业,硕士,工程师,主要从事遥感地质、地质灾害研究。E-mail:liuwen2009.hi@163.com

    通讯作者:

    余天彬(1988-),男,地质工程专业,硕士,工程师,主要从事地质灾害遥感应用研究。E-mail:251499051@qq.com

  • 中图分类号: P642.22

Preliminary analysis on basic characteristics and mechanism of rockfalls in layered red rocks with gentle dip angle: A case study of the Tiejiangwan rockfall in Hongya County, Sichuan Province

  • 摘要: 红层区常发育缓倾角岩质边坡,因其软硬相间的岩性组合,地质灾害频发,灾害严重。基于光学卫星遥感、无人机航空摄影测量、现场调查等天空地一体化的技术手段,以2021年4月5日发生的四川洪雅铁匠湾缓倾角红层岩质崩塌为研究对象,探讨了崩塌的基本特征和成因机理,分析了铁匠湾陡崖区崩塌灾害发展趋势,以期为红层区类似灾害的研究提供资料支撑。结果表明:铁匠湾崩塌可分为主崩塌区和崩塌影响区两个区域,其中主崩塌区包括崩源区1处、铲刮区1处、堆积区1处、流水二次搬运堆积区1处,崩塌影响区包括潜在崩源区1处、扰动变形区5处。崩塌源区具有“上硬下软”的岩石组合,岩体发育两组近于垂直的优势结构面,2013年已表现出变形迹象,在降雨、温差的持续作用下导致源区危岩体的最终失稳垮塌,巨大的冲击力作用于危岩体下方的老崩塌堆积体和基岩,引起崩塌-碎屑流灾害链。在光学遥感影像解译和野外调查的基础上,认为铁匠湾崩塌存在二次崩塌的风险,在崩塌邻区识别出类似崩塌隐患点6处,建议采用无人机、机载LiDAR等技术手段开展铁匠湾陡崖区崩塌隐患的早期识别与持续监测。
  • 图  1  铁匠湾崩塌区域地质简图

    Figure  1.  Regional geological map of the Tiejiangwan rockfall

    图  2  铁匠湾崩塌分区特征及野外照片

    Figure  2.  Subarea features and field photos of the Tiejiangwan rockfall

    图  3  剖面图和进度分布图

    Figure  3.  Geological cross-section diagram of the rockfall and velocity distribution of the debris flow movement

    图  4  铁匠湾崩塌源区多期遥感影像对比图

    Figure  4.  Multi-period remote sensing images comparison of the source area of the Tiejiangwan rockfall

    图  5  崩塌前降雨过程和温差变化柱状图

    Figure  5.  Histogram of rainfall process and temperature variation before rockfall

    图  6  铁匠湾陡崖区及潜在崩塌隐患分布图

    注:a为陡崖区WorldView-2光学卫星影像;b—d为陡崖区野外照片;e—j为潜在崩塌隐患WorldView-2光学卫星影像。

    Figure  6.  Distribution map of the steep cliff area and potential rockfalls in the Tiejiangwan area

    表  1  铁匠湾崩塌光学遥感精细解译统计表

    Table  1.   Statistical table of optical remote sensing interpretation in Tiejiangwan rockfall

    名称编号面积/m2厚度/m估算体积/(104 m3
    潜在崩源区231111025.42
    崩源区9578110105.36
    铲刮区305731545.86
    堆积区14629610146.30
    流水二次搬运堆积区885232.66
    扰动变形区A4836157.25
    B2874102.87
    C919054.60
    D310451.55
    E200451.00
    下载: 导出CSV
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  • 收稿日期:  2022-06-23
  • 录用日期:  2023-04-17
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  • 网络出版日期:  2023-04-25
  • 刊出日期:  2023-10-25

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