不同降雨类型对中层堆积层滑坡变形的影响——以万州区学堂塝滑坡为例
Deformation influence of rainfall types on medium-seated colluvial landslide—A case study of Xuetangbang landslide in Wanzhou
张明晓 1李德营 1倪冰冰 1王诗仪 1游绍强1
作者信息
- 1. 中国地质大学(武汉)工程学院,湖北 武汉 430074
- 折叠
摘要
堆积层滑坡在我国广泛分布,降雨为导致滑坡发生的主要诱因,其常见特征为雨季时滑坡变形显著增加.以重庆万州区学堂塝滑坡(降雨型中层堆积层滑坡)为例,采用现场调查、多源变形监测以及数值模拟等方法研究了学堂塝滑坡变形与降雨类型之间的关联性,分析了短时间暴雨和长时间中雨条件下滑坡变形的响应差异.结果表明:降雨是学堂塝滑坡发生的主要触发因素,滑坡在雨季呈现出阶跃型变形的特征;学堂塝滑坡在短时间暴雨作用下,由于滑坡体物质渗透性差异和滑坡体厚度的影响,滑坡饱和区范围小,滑坡变形小,而在长时间中雨作用下,滑坡中后部孔隙水压力大幅增加,滑坡变形强烈,滑坡产生明显阶跃型变形.
Abstract
Colluvial landslides are widely distributed in China,whose main inducing factor is rainfall infiltration.The common characteristic of rainfall-induced landslide is that its deformation increases significantly during the rainy season.Xuetangbang landslide was taken as an example of rainfall-induced colluvial landslide with medi-um thickness.The relationship between landslide deformation and rainfall types was studied by field investiga-tion,multi-source deformation monitoring and numerical simulation.The response difference of short-time rain-storm and long-time moderate rain on landslide deformation was analyzed.The results are as follows:rainfall is the main trigger of Xuetangbang landslide and the landslide displays the step-like deformation characteristic dur-ing the rainy season.Under the influence of short-time rainstorm,due to the influence of landslide mass with different permeability and thickness,the saturation area of the landslide is relatively narrow,and the deforma-tion of the landslide is weak.However,under the influence of long-term moderate rain,the pore water pressure of the area at the middle and rear of the landslide increases,the deformation of the landslide is strong,and the obvious step-type deformation of landslide occurs.
关键词
堆积层滑坡/滑坡变形/降雨类型/数值模拟/滑坡监测/学堂塝滑坡Key words
accumulation landslide/landslide deformation/rainfall type/numerical simulation/landslide monitor-ing/Xuetangbang landslide引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据