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2024.7.17秭归湾水田滑坡特征与失稳机理

苏鹏民 陈龙 李雨洲 邓茂林 梁之康 彭旭 朱晓涵 周梦婷

苏鹏民,陈龙,李雨洲,等. 2024.7.17秭归湾水田滑坡特征与失稳机理[J]. 地质科技通报,2026,45(4):1-13 doi: 10.19509/j.cnki.dzkq.tb20250099
引用本文: 苏鹏民,陈龙,李雨洲,等. 2024.7.17秭归湾水田滑坡特征与失稳机理[J]. 地质科技通报,2026,45(4):1-13 doi: 10.19509/j.cnki.dzkq.tb20250099
SU Pengmin,CHEN Long,LI Yuzhou,et al. Characteristics and instability mechanism of Wanshuitian landslide in Zigui County, China on July 17, 2024[J]. Bulletin of Geological Science and Technology,2026,45(4):1-13 doi: 10.19509/j.cnki.dzkq.tb20250099
Citation: SU Pengmin,CHEN Long,LI Yuzhou,et al. Characteristics and instability mechanism of Wanshuitian landslide in Zigui County, China on July 17, 2024[J]. Bulletin of Geological Science and Technology,2026,45(4):1-13 doi: 10.19509/j.cnki.dzkq.tb20250099

2024.7.17秭归湾水田滑坡特征与失稳机理

doi: 10.19509/j.cnki.dzkq.tb20250099
基金项目: 国家自然科学基金项目(42172303)
详细信息
    作者简介:

    苏鹏民:E-mail:supengmin0720@163.com

    通讯作者:

    E-mail:dengmaolin@ctgu.edu.cn

  • 中图分类号: P642.22

Characteristics and instability mechanism of Wanshuitian landslide in Zigui County, China on July 17, 2024

More Information
  • 摘要:

    2024年7月17日8点40分,位于湖北省秭归县归州镇贾家店村的湾水田滑坡失稳破坏,总方量约80万 m3,导致1200 m村级公路和60亩农林柑橘园损毁,该滑坡具有极高的隐蔽性和强烈的突发性。为系统揭示该滑坡发育特征、运动过程与失稳机理,通过详细的野外地质调查,无人机航拍及监测数据分析等手段,在分析湾水田滑坡运动特征的基础上,结合Geo‑Studio有限元模拟软件,计算强降雨条件下滑坡内部渗流特征及坡体稳定性演变过程,进而揭示其成因机制与破坏模式。结果表明,湾水田滑坡属于高速岩质滑坡,按运动特征可分为启滑区、二次解体区、主堆积区、右侧撒落区和左侧撒落区共5个亚区。砂泥岩互层的地层岩性,槽脊相间的微地貌以及节理发育的岩体结构是湾水田滑坡发生的内在因素,滑前17 d累计降雨量达253.8 mm的2轮持续强降雨是主要外因。持续强降雨引起坡体内部孔隙水压力持续上升,滑坡安全系数由1.2降至0.97,显著降低坡体稳定性。历经2轮强降雨,滑体与滑带岩土体孔隙水压力大幅增加,最高孔压达75.4 kPa,孔压最大增量达303.9 kPa。孔隙水压力的突增最终引发滑坡失稳破坏。湾水田滑坡由于岩层倾向方向滑动受阻,坡体沿临空面滑动,主滑方向10°与岩层倾向282°形成88°的夹角,为近岩层走向滑动的特殊破坏模式,显著区别于顺层滑坡的失稳机制,具有高度的隐蔽性、强烈的突发性。研究成果对我国山区存在类似条件的灾害隐患点的防灾减灾、监测预警与工程防治工作具有重要理论与实践意义。

     

  • 图 1  湾水田滑坡滑动前(a)、后(b)全貌影像对比

    Figure 1.  Comparison of panoramic images of Wanshuitian landslide before and after slide

    图 2  湾水田滑坡区域地质构造图

    Figure 2.  Geological structural map of Wanshuitian landslide area

    图 3  湾水田滑坡区槽脊相间的地形地貌示意图

    Figure 3.  Topography and geomorphology of alternating troughs and ridges in Wanshuitian landslide area

    图 4  湾水田滑坡结构面赤平投影图

    Figure 4.  Stereographic projection of structural surface of Wanshuitian landslide

    图 5  2024年7月湾水田滑坡失稳前降雨过程

    Figure 5.  Rainfall process before instability of Wanshuitian landslide at July, 2024

    图 6  湾水田滑坡失稳过程录像

    Figure 6.  Video snapshots during instability process of Wanshuitian landslide

    图 7  湾水田滑坡分区特征和运动特征

    Figure 7.  Zoning and movement characteristics of Wanshuitian landslide

    图 8  湾水田滑坡工程地质剖面图(剖面位置见图7

    Figure 8.  Engineering geological profiles of Wanshuitian landslide

    图 9  湾水田滑坡宏观变形特征

    Figure 9.  Macroscopic deformation characteristics of Wanshuitian landslide

    图 10  湾水田滑坡数值模型

    Figure 10.  Numerical model of Wanshuitian landslide

    图 11  湾水田滑坡孔隙水压力分布变化过程

    Figure 11.  Distribution evolution of pore water pressure in Wanshuitian landslide

    图 12  P1~P3号监测点(由浅至深)孔隙水压力变化曲线

    Figure 12.  Pore water pressure variation curves for monitoring points P1-P3 (from shallow to deep)

    图 13  湾水田滑坡滑前17 d滑坡安全系数变化

    Figure 13.  Variation of landslide safety coefficient over 17 days before landslide in Wanshuitian landslid

    图 14  湾水田滑坡演化过程模式

    Figure 14.  Evolution process models of Wanshuitian landslide

    表  1  湾水田滑坡物理力学参数

    Table  1.   Physical and mechanical parameters of Wanshuitian landslide

    区域 重度γ/
    (kN·m−3)
    黏聚力
    C/kPa
    内摩擦
    φ/(°)
    饱和体积
    含水率W/%
    渗透系数
    K/(m·d−1)
    泊松
    μ
    弹性模
    E/MPa
    碎块石土 20.6 33 32 27.6 3.7 0.35 17.8
    裂隙岩体 22 120 35 22.3 2.9 0.3 20
    滑带 21.4 19 21 16 0.05 0.29 12.9
    滑床 24.3 1080 38 1 0.001 0.16 1180
    下载: 导出CSV

    表  2  近岩层走向滑动失稳模式的典型滑坡统计

    Table  2.   Statistics of typical landslides with failure mode of sliding nearly along rock strike

    滑坡名称 发生日期 岩层倾角 主滑方向 视滑角
    卡门子湾滑坡[38] 2019/12/10 45° 340° 65°
    小岩头滑坡 2021/08/28 280° 210° 70°
    湾水田滑坡 2024/07/17 282° 10° 88°
    下载: 导出CSV
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出版历程
  • 收稿日期:  2025-03-02
  • 录用日期:  2025-07-18
  • 修回日期:  2025-07-09
  • 网络出版日期:  2025-12-22

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