摘要
湖北黄梅县袁山村滑坡碎屑流是花岗岩残积土滑坡碎屑流,受地质条件影响,其运动过程较为复杂,突发性强。为研究中低山区花岗岩残积土滑坡碎屑流动力机制,分析降雨型花岗岩残积土滑坡碎屑流的运动过程,通过野外地质调查,利用无人机航拍(unmanned aerial vehicle,简称UAV)、遥感影像形成的数字地表模型(digital elevation model,简称DEM)、现场勘查及地质资料分析、数值模拟等方法对滑坡碎屑流进行运动过程分析。结果表明,滑坡碎屑流的运动过程中最大堆积厚度为6 m,在t=20 s时达到运动峰值17 m/s,而实际运动峰值应当更大,出现在滑源区开始失稳的阶段,整个运动过程分为3个阶段:0~30 s为滑坡碎屑流失稳启动阶段,在一级平台加速;30~70 s受地形影响,滑动体进行二次加速并发生部分偏转运动,冲毁袁山村的建筑物;70~130 s为减速堆积阶段,掩埋和堆积了建筑物。本研究可为类似滑坡碎屑流的防治提供参考。
[Objective]The landslide in Yuanshan Village,Huangmei County,Hubei Province,represents a granite residual soil avalanche debris flow with complex and abrupt movement dynamics influenced by geological conditions.This study investigates the kinematic mechanisms of such landslide-debris flows in mid-low mountainous areas by analyzing the motion process of this specific event.[Methods]Through the field geological survey,the movement process of the landslide debris flow was analyzed based on UAV aerial photography,digital elevation model(DEM),on-site investigation,geological data analysis,and numerical simulations.[Results]The results show that the maximum accumulation thickness of the avalanche is 6 m during the movement process.The peak velocity reaches 17 m/s at t=10 s.The actual peak velocity should be larger and appears when the slip source area begins to be unstable.The whole movement process could be divided into three stages:during the first 30 s,the granite residual soil lost its stability,which resulted in the initiation and acceleration of the debris flow at the firstlevel platform;in 30-70 s,affected by the terrain,the debris flow was accelerated for the second time.A part of the debris flow changed its flow direction and destroyed the buildings in Yuanshan Village.From 70 s to 130 s,the debris flow decelerated and accumulated,during this stage the buildings were buried and accumulated by the debris flow.[Conclusion]This study can provide a reference for the prevention and control of similar disasters.
作者
朱颖
甘建军
鹿淇瑞
邓怡武
邓坤
ZHU Ying;GAN Jianjun;LU Qirui;DENG Yiwu;DENG Kun(National and Local Joint Engineering Laboratory for Water Engineering Safety and Resource Efficient Utilization in Poyang Lake Basin,Nanchang Institute of Technology,Nanchang 330099,China;Institute of Water Resources and Water Ecology and Environment,Jiangxi Academy of Water Conservancy,Nanchang 330029,China)
出处
《地质科技通报》
北大核心
2025年第3期268-279,共12页
Bulletin of Geological Science and Technology
基金
国家自然科学基金项目(42162025)
2021年度浙江省山体地质灾害防治协同创新中心开放基金项目(2PCMGH-2021-02)
江西省科技重点研发计划项目(20203BBGL73220)。
关键词
降雨型滑坡碎屑流
花岗岩残积土
运动过程
数值模拟
Massflow
湖北黄梅
rainfall induced-movement of landslide debris flow
granite residual soil remnant
process of movement
numerical simulation
Massflow
Huangmei County,Hubei Province
