复杂运动路径下滑坡转向变形机理研究
Study on the Mechanism of Landslide Steering Deformation under Complex Moving Path
谢强 1陈昱成 2田仁珺 2傅翔 3班宇鑫4
作者信息
- 1. 重庆大学土木工程学院,重庆 400045;库区环境地质灾害防治国家地方联合工程研究中心(重庆),重庆 400045
- 2. 重庆大学土木工程学院,重庆 400045
- 3. 重庆交通大学河海学院,重庆 400074
- 4. 重庆科技学院建筑工程学院,重庆 401331
- 折叠
摘要
滑坡受地表地形地貌和滑面形态的影响,在运动过程中常表现出转向、分叉、聚合等复杂行为,研究复杂运动路径下滑坡转向变形机理对滑坡的防灾减灾工作有重要意义.以三维地质建模技术为基础,构建庞家湾滑坡的三维颗粒流模型.通过PFC模拟滑坡的运动过程,得到如下结论:庞家湾滑坡发生了转向和聚合行为,滑坡中后部土体的滑动方向发生偏转并在坡脚与东北区域滑体聚合;滑坡中部发生转向运动的颗粒以较快的速度首先开始滑动,且速度由滑坡中部向周围呈辐射状减小;滑坡前缘在整个运动过程中,始终保持较快的运动速度,而后缘运动速度较慢,此外滑体表面速度大于滑体内部和底面速度,而滑坡各部分运动速度不同则是造成滑坡转向变形的重要原因.揭示了复杂路径滑坡的运动规律和转向变形机理,为评估滑坡风险,采取更为合理的防治方案提供理论依据.
Abstract
The landslide is affected by the topography and sliding surface morphology.In the process of movement,it often shows complex behaviors such as steering,bifurcation and aggregation.It is of great significance to study the mechanism of landslide steering deformation under complex moving paths for prevention and mitigation of landslide disaster.Based on the three-dimensional geological modeling technology,the three-dimensional particle flow model of Pangjiawan landslide is constructed.Through PFC simulation of landslide movement process,following conclusions are conducted:Steering and aggregation occurred in the Pangjiawan landslide,and the sliding direction of the soil in the middle and back of the landslide deflected and the soil aggregates with that from the northeast region at slope toe;The particles with turning movement in the middle of the landslide begin to slide first with fast speed,and the speed decreases radially from the middle of the landslide to the surrounding area.The leading edge of the landslide keeps a high speed during the whole movement,while the trailing edge of the landslide moves slowly.In addition,the surface velocity of the landslide is larger than that of the interior and bottom of the landslide,and the different velocity of each part of the landslide is an important reason for the steering deformation of the landslide.It reveals the movement law and steering deformation mechanism of complex moving landslides,and provides a theoretical basis for evaluating landslide risks and adopting more reasonable prevention schemes.
关键词
复杂运动路径/滑坡/转向变形/三维建模/PFCKey words
complex moving path/landslide/steering deformation/three-dimensional modeling/PFC引用本文复制引用
基金项目
重庆市规划与自然资源局科技项目(DK2021Z05null01C)
重庆市地质灾害防治中心科技项目(KJ2021050)
出版年
2024
NETL
NSTL
维普
万方数据