宋琨，阮迪，吕泓霖，等. 滑坡失稳运动过程的物质点法模拟及动力特性分析−以三峡库区盐关滑坡为例[J]. 煤田地质与勘探，2023，51(7)：140−150. DOI: 10.12363/issn.1001-1986.22.11.0897
引用本文: 宋琨，阮迪，吕泓霖，等. 滑坡失稳运动过程的物质点法模拟及动力特性分析−以三峡库区盐关滑坡为例[J]. 煤田地质与勘探，2023，51(7)：140−150. DOI: 10.12363/issn.1001-1986.22.11.0897
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SONG Kun，RUAN Di，LYU Honglin，et al. Material point method-based simulation and dynamic characteristic analysis of instability-induced landslide movement: A case study of the Yanguan landslide in the Three Gorges Reservoir area[J]. Coal Geology & Exploration，2023，51(7)：140−150. DOI: 10.12363/issn.1001-1986.22.11.0897
Citation: SONG Kun，RUAN Di，LYU Honglin，et al. Material point method-based simulation and dynamic characteristic analysis of instability-induced landslide movement: A case study of the Yanguan landslide in the Three Gorges Reservoir area[J]. Coal Geology & Exploration，2023，51(7)：140−150. DOI: 10.12363/issn.1001-1986.22.11.0897
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滑坡失稳运动过程的物质点法模拟及动力特性分析以三峡库区盐关滑坡为例

Material point method-based simulation and dynamic characteristic analysis of instability-induced landslide movement: A case study of the Yanguan landslide in the Three Gorges Reservoir area

    摘要
  • 摘要: 滑坡失稳运动的动力学过程及影响范围对滑坡灾害的风险区划分和防控具有重要影响。为了能准确且系统地分析滑坡失稳运动过程中的动力特性变化，对三峡库区湖北省秭归县盐关滑坡失稳运动过程详细调查分析，通过滑带土的室内环剪试验获得其残余强度变化规律及不同剪切速率的滑带土运动参数。采用适用于大变形模拟计算的物质点法(MPM)，再现了盐关滑坡的2次运动堆积过程，并分析了滑坡运动过程中的速度、能量、冲击力等动力特性的动态变化与阶段特征。结果表明，盐关滑坡物质点法(MPM)模拟结果与现场勘测运动距离和滑坡堆积形态相吻合；滑坡2次运动过程均经历失稳启动、加速滑动、减速堆积和停止4个阶段；第一、二次滑动分别在第10、31 s时达到了1.9、3.2 m/s的速度峰值，总动能为1.57×107、1.60×108 J，冲击力峰值为7.82×103、3.87×104 kN；滑坡平均速度、总动能及最大冲击力均随滑距增加呈现先增加后减小的变化趋势。物质点法应用于滑坡动力学分析取得较好的效果，室内环剪试验获取的控制滑坡运动的滑带土残余摩擦系数为物质点法模拟计算提供了可靠的数据支撑。滑坡失稳运动过程的动力学特征在滑坡灾害范围和危害程度预测及风险评价中具有重要意义。

     

    Abstract: The dynamic process and influence range of instability-induced landslide movement have important effects on the risk area division and prevention of landslide hazards. To accurately and systematically analyze the changes in the dynamic characteristics of landsides during their instability-induced movement, this study thoroughly investigated and analyzed the instability-induced movement process of the Yanguan landslide in the Three Gorges Reservoir area, Zigui County, Hubei Province. Through laboratory ring shear tests, this study determined the changing pattern of residual strength and the motion parameters of sliding zone soil under different shear rates. Accordingly, using the material point method (MPM), which is suitable for the simulation calculation of large deformations, this study reproduced two movement and accumulation processes of the Yanguan landslide. Furthermore, it analyzed the dynamic changes and staged characteristics (e.g., velocity, energy, and impact force) of the dynamic characteristics in the process of landslide movement. The results show that (1) The simulation results of the Yanguan landslide obtained using the MPM are consistent with the movement distances and deposit morphologies determined through field investigation. (2) Each movement process of the landslide can be divided into four stages: instability initiation, accelerated sliding, decelerated accumulation, and steady stop. (3) During the first and second sliding events, the peak velocities reached 1.9 m/s at 10 s and 3.2 m/s at 31 s, respectively, the total kinetic energy was 1.57×107 J and 1.60×108 J, respectively, and the peak impact forces were 7.82×103 kN and 3.87×104 kN, respectively. (4) The average velocity, total kinetic energy, and maximum impact force of the landslide increased first and then decreased with an increase in the sliding distance. The results indicated that the MPM yielded encouraging results in the dynamic analysis of the landslide. Furthermore, the laboratory ring shear tests determined the sliding zone soil’s residual friction coefficient, which controls the landslide movement, providing reliable data for the MPM-based simulation calculation. The dynamic characteristics of the instability-induced landslide movement are of great significance for the scope and degree prediction and risk assessment of landslide hazards.

     

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