降雨过程中堆积体边坡瞬态稳定性分析

Transient Stability Analysis of Accumulation Slope During Rainfall

【目的】以豫西渑池县槐扒滑坡为地质原型,探究降雨条件下堆积体边坡变形破坏启动机制。【方法】基于前人研究建立概化堆积体边坡的地质模型和数值试验模型。【结果】降雨作用下,坡脚首先发生破坏,随后牵引斜坡发生整体变形破坏。边坡灾变过程可描述为3个阶段:(1)雨水入渗—堆积体边坡浸润变形阶段;(2)堆积体边坡裂缝发展阶段;(3)滑坡发生阶段。【结论】其变形破坏过程可以概括为:坡脚变形破坏—中后部变形发展—裂缝发育贯通—滑坡发生。

[Purposes] Taking Huaiba landslide in Mianchi County,West Henan Province as a geological prototype,the initiation mechanism of slope deformation and failure of accumulation body under the condition of rainfall was investigated.[Methods] The geological model and numerical test model of generalized accumulation slope were established based on previous studies.[Findings] Under the action of rainfall,the slope foot first failed and then the traction slope deformed and failed as a whole.The process of slope disaster can be described as three stages:(1) rainwater infiltration — accumulation body slope infiltration deformation stage;(2) Development stage of slope crack of accumulation body;(3) stage of landslide occurrence.[Conclusions] The deformation and failure process can be summarized as follows:slope toe deformation and failure—middle and rear deformation development—fracture development—landslide occurrence.