1.西南石油大学土木工程与测绘学院,四川 成都 610500
2.西南石油大学工程安全评估与防护研究院,四川 成都 610500
3.成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川 成都 610059
徐奕梓(1998—),女,硕士研究生。主要从事岩土工程及地质灾害方面的研究。 E-mail:1044383621@qq.com
樊晓一(1974—),男,教授,博导,博士。主要从事岩土工程、地质灾害教学科研工作。E-mail:fxy@swpu.edu.cn
收稿:2022-01-09,
修回:2022-02-13,
纸质出版:2023-10-15
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徐奕梓,樊晓一,杨维斌等.贵州水城高速远程滑坡运动过程及动力参数分析[J].防灾减灾工程学报,2023,43(05):987-998.
XU Yizi,FAN Xiaoyi,YANG Weibin,et al.Analysis of Motion Process and Dynamic Parameters of High‑speed and Long‑distance Landslide in Shuicheng, Guizhou Province[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):987-998.
徐奕梓,樊晓一,杨维斌等.贵州水城高速远程滑坡运动过程及动力参数分析[J].防灾减灾工程学报,2023,43(05):987-998. DOI: 10.13409/j.cnki.jdpme.20220109002.
XU Yizi,FAN Xiaoyi,YANG Weibin,et al.Analysis of Motion Process and Dynamic Parameters of High‑speed and Long‑distance Landslide in Shuicheng, Guizhou Province[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(05):987-998. DOI: 10.13409/j.cnki.jdpme.20220109002.
高速远程滑坡的运动速度、厚度和致灾能量在时程、运程上的分布是揭示灾难性滑坡致灾的重要指标。水城滑坡是近年来降雨诱发的典型隐蔽性、突发性高速远程滑坡,利用Massflow模型以上述多个指标参数为研究核心揭示其致灾特征。研究结果表明:滑坡运动的基底摩擦角和孔隙水压力系数分别为20°和0.4;滑坡历时约60 s,最大前缘运动速度为42 m/s,左右两侧前缘滑坡体堆积厚度分布分别呈现“双峰”和“单峰”特征,最大堆积厚度为22 m;左右主滑方向上的最大动能分别为1.75×10
6
J和8.5×10
5
J;房屋建筑区用时8 s完全被掩埋,建筑物监测点处最大冲击力估算值分别为3 346 kPa和1 049 kPa,远大于山区农村房屋建筑所能承受的荷载极值。研究成果为灾难性高速远程滑坡碎屑流的动力学效应分析提供参考,对滑坡灾变风险的定量评估提供了依据。
The distribution of velocity, thickness, and kinetic energy over time and the course of high-speed and long-distance landslides are important indicators for revealing the disasters caused by catastrophic landslides. Shuicheng landslide is a typical hidden, sudden high-speed remote landslide induced by rainfall in recent years. This paper uses Massflow to reveal its disaster-causing characteristics, with the above-mentioned multiple index parameters as the core of the research. The simulation results show that the base friction angle and pore water pressure coefficient of landslide motion are 20° and 0.4, respectively. The landslide lasted about 60 s. The maximum velocity of the front edge is 42 m/s. The thickness distribution of the front edge landslide mass on the left and right sides shows the characteristics of "double peak" and "single peak", respectively. The maximum accumulation thickness is 22 m. The maximum kinetic energy in the left and right main sliding directions are 1.75×106 J and 8.5×105 J, respectively. The housing construction area was completely buried in 8 seconds. The estimated maximum impact force at the monitoring point of the building is 3346 kPa and 1049 kPa, which is far greater than the extreme load that rural houses in mountainous areas can be withstand. The research results can provide a reference for the analysis of the dynamic effects of catastrophic high-speed remote landslide debris flow in Southwest China, and provide a basis for the quantitative assessment of landslide disaster risk.
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