摘要
白龙江流域山高坡陡,分布大量高位滑坡,是我国高位地质灾害风险极高的地区。舟曲县立节镇北山古滑坡位于白龙江左岸,滑坡剪出口与江面高差约700 m,历史上曾发生过多次变形破坏。通过资料搜集、遥感调查与解译、现场调查等手段,查明了立节北山滑坡的地质环境与变形破坏特征,基于光滑质点流体动力学与等效流体模型,开展滑坡后破坏运动过程模拟,对远程致灾危险进行预测分析。模拟分析表明,立节北山滑坡若发生失稳剧滑,将形成高位高速远程滑坡-碎屑流灾害,滑动距离达1 600 m,最大运动速度45.7 m/s,沿途铲刮方量77.7万m~3,滑体扩容系数1.32。滑体约200 s后完全停止运动并堆积,堆积区面积2.2×10~5 m~2,覆盖坡脚立节镇一半的范围,最大堆积厚度17.8 m,最大冲击速度30 m/s。研究结果为立节北山滑坡开展风险评价与分区提供定量化数据,为白龙江流域大型高位滑坡精细调查与风险评估提供参考依据。
Being characterized by high and steep slopes,and with a large number of landslides located in high position,The Bailong River basin is highly prone to geological disasters in China.The Beishan landslide is an ancient landslide on left bank of Bailong River in Lijie Town,Zhouqu County,which has been deformed and damaged many times in history.The height difference between the toe of rupture surface and the river surface is about 700 m.By means of data collection,remote sensing interpretation and field investigation,the geological environment and failure characteristics of the Beishan landslide are identified,and numerical sinmulation of the post-failure process is carried out based on the smooth particle hydrodynamics and equivalent fluid model to predict and analyze the remote disaster-causing hazard.The results show that if the Beishan landslide may produce a rapid avalanche with run-out distance of 1 600 m,maximum movement speed of 45.7 m/s,entrainment volume of 777 000 m~3,and expansion coefficient of 1.32.The sliding mass will completely stop moving and accumulate after about 200s,and the accumulation area will be 2.2×10~5 m~2,covering half of Lijie town at the foot of the slope.The maximum accumulation thickness is 17.8 m and the maximum impact velocity is 30 m/s,which may cause significant casualties and property loss.The study provide a quantitative basis for risk zoning of the Beishan landslide,and provide an important reference for risk assessment of large-scale landslides in the Bailong River Basin.
作者
冯振
游杨
陈亮
王立朝
FENG Zhen;YOU Yang;CHEN Liang;WANG Lichao(China Institute of Geo-Environmental Monitoring,Beijing 100081,China;Second Geological Brigade of Hubei Geological Bureau,Enshi 445000)
出处
《灾害学》
CSCD
北大核心
2024年第1期45-50,共6页
Journal of Catastrophology
基金
中国地质调查局地调项目(DD20190645
DD20221748)
贵州电科院科技项目(GZKJXM20220055)。
关键词
大型滑坡
变形破坏特征
高速远程
运动过程
数值模拟
large-scale landslide
failure characteristics
rapid and long-runout
kinematic process
numerical simulation
