细粒含量对泥石流启动影响的离心机模型试验

发布时间：2018-03-16 12:07

本文选题：细粒含量　切入点：泥石流　出处：《湖南大学学报(自然科学版)》2017年09期 　论文类型：期刊论文

【摘要】：采用自主研发的离心机可视化试验装置,在坡度和降雨强度不变的条件下,配置6组不同细粒含量的坡体,进行降雨诱发泥石流离心机模型试验.通过分析坡体破坏形态、孔隙水压力变化、雨水迁移规律等,研究细粒含量对泥石流启动过程的影响.研究结果表明:泥石流启动存在临界细粒含量(约为15%),在临界细粒含量范围内,坡体表现为分层滑动破坏,10%细粒含量的泥石流启动时间最短;泥石流启动过程中坡内孔压逐渐上升至峰值后波浪状下降,随着细粒含量的增加,孔压曲线趋于平缓;细粒含量影响雨水的渗透速度和路径,这是影响坡体破坏形态和决定泥石流能否启动的直接原因.
[Abstract]:In the condition of constant slope and rainfall intensity, six groups of slope bodies with different fine grain contents were deployed to carry out the model test of wet-induced debris flow centrifuge by using a self-developed centrifuge visual test device. The failure pattern of slope body was analyzed. The change of pore water pressure and the migration law of Rain Water, etc., to study the effect of fine particle content on the starting process of debris flow. The results show that there exists critical fine grain content (about 15%) in the starting of debris flow, which is within the range of critical fine grain content. The slope body shows the shortest start-up time of debris flow with 10% fine grain content of stratified sliding failure, the pore pressure in the slope gradually rises to the peak value and then decreases in wave shape, and the pore pressure curve tends to be gentle with the increase of fine grain content. The content of fine particles affects the permeation speed and path of Rain Water, which is the direct reason that affects the failure form of slope body and determines whether the debris flow can be started or not.
【作者单位】：同济大学地下建筑与工程系;同济大学岩土及地下工程教育部重点实验室;内蒙古大学交通学院;上海城市管理职业技术学院土木工程与交通学院;
【基金】：国家自然科学基金资助项目(41272296,51479138)~~
【分类号】：P642.23

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