Characteristics and instability mechanism of Wanshuitian landslide in Zigui County, China on July 17, 2024
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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。Abstract:ObjectiveAt 8:40 am on July 17, 2024, the Wanshuitian landslide in Jiajiadian Village, Guizhou Town, Zigui County, underwent instability and failure, with a total displaced volume of approximately
800000 m3. This landslide damaged1200 m of village-level roads and 60 mu (around 9.88 acres) of citrus farmland and forest, exhibiting extreme concealment and suddenness. This study aims to systematically reveal the development characteristics, movement process, and instability mechanism of the landslide.MethodsBased on the analysis of movement characteristics of the Wanshuitian landslide, detailed field geological surveys, UAV aerial photography, and monitoring data analysis were carried out. Combined with the Geo-Studio finite element simulation software, the internal seepage characteristics and the evolution process of slope stability under heavy rainfall conditions were calculated, thereby revealing its genetic mechanisms and failure modes.
ResultsThe results showed that the Wanshuitian landslide was a high-speed rock landslide, which could be divided into five subzones based on movement characteristics: the initiation zone, secondary disintegration zone, main accumulation zone, right scattering zone, and left scattering zone. The interbedded lithology of sandstone and mudstone, the micro-geomorphology of alternating troughs and ridges, and the jointed rock mass structure were the internal factors for the occurrence of the Wanshuitian landslide. The main external factor was two rounds of continuous heavy rainfall with a cumulative rainfall of 253.8 mm over 17 days before sliding. Continuous heavy rainfall led to a sustained increase in pore water pressure within the slope, and the landslide safety coefficient decreased from 1.2 to 0.97, significantly reducing slope stability. After two rounds of heavy rainfall, the pore water pressure in the rock and soil mass of the landslide body and sliding zone increased significantly, reaching a maximum of 75.4 kPa and a maximum incremental increase of 303.9 kPa. The sudden increase in pore water pressure ultimately triggered slope instability and failure. As the sliding movement was blocked along the layer dip, the slope slid along the free surface. The main sliding direction of 10° formed an angle of 88° with the rock dip direction of 282°, representing a special failure mode of sliding nearly along the rock strike. The mode was significantly different from the instability mechanism of consequent bedding landslides and was characterized by high concealment and strong suddenness.
ConclusionThe research results have important theoretical and practical significance for disaster prevention and mitigation, monitoring and early warning, and engineering prevention at potential disaster sites with similar geological conditions in mountainous areas of China.
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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
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
角φ/(°)饱和体积
含水率W/%渗透系数
K/(m·d−1)泊松
比μ弹性模
量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 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° -
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