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

作　　者：张明晓 李德营[1] 倪冰冰 王诗仪 游绍强 ZHANG Mingxiao;LI Deying;NI Bingbing;WANG Shiyi;YOU Shaoqiang(Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《安全与环境工程》2024年第5期102-111,共10页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(41772310)。

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。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 medium thickness.The relationship between landslide deformation and rainfall types was studied by field investigation,multi-source deformation monitoring and numerical simulation.The response difference of short-time rainstorm 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 during 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 deformation 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 

分 类 号：X43[环境科学与工程—灾害防治] P642.22[天文地球—工程地质学]