平敞型高速远程滑坡碎屑流运动与堆积演化规律研究
Debris Flow Movement and Accumulation Evolution of Flat Long-runout Landslide
作者：崔 杰(西南科技大学 环境与资源学院)；高春玉(四川大学 水利水电学院)；张志龙(四川大学 水利水电学院)；姚依凡(四川大学 水利水电学院)
Author：CUI Jie(School ofSouthwest University of Science and Technology)；GAO Chunyu(College of Water Resource Hydropower,Sichuan Univ)；ZHANG Zhilong(College of Water Resource Hydropower,Sichuan Univ)；YAO Yifan(College of Water Resource Hydropower,Sichuan Univ)
收稿日期：2020-03-30 年卷（期）页码：2020,52(6):-
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：平敞型滑坡; 碎屑流; 反序结构;基底液化
Key words：flat rocky landslide; debris flow; inverse grading structure ; base liquefaction
基金项目：国家重点研发计划“高速远程滑坡灾变机制与动力学过程”(2018YFC1505003)；国家自然科学基金资助项目“库岸堆积层滑坡的自适应调整机制与失稳判识模型”(41977246)
中文摘要
尼续村滑坡发育于藏南亚东-谷露裂谷带中段开阔的半地堑盆地边缘,堆积区为平坦河谷地貌,属于典型的“平敞型”岩质高速远程滑坡,堆积演化序列完整且保留至今,研究该滑坡有助于揭示这一类高速碎屑流运动与堆积演化机制。本课题对尼续村滑坡各组成部分开展了详细地面调查,结合地球物理方法揭示了源区斜坡破坏基本特征与破坏机理,通过遥感解译与堆积物颗分试验揭示了滑体演化各阶段碎屑物质的空间展布规律。通过研究提出,尼续村滑坡的高速碎屑流转化过程可划分为三个阶段,即在源区斜坡段的滑坡结构碎裂化阶段、中部滑动区的物质结构碎屑化阶段、前缘区域的碎屑流流态化运动与堆积阶段,相对应的滑体结构具有碎裂化-碎屑化-流态化的阶跃式转化过程。中部与前缘区域的碎屑流以内部或底部的层状剪切破碎为主,使得碎屑流在“摊薄效应”下继续运动与纵向扩展,而碎屑流运动由“干”的高速流态化转为固态静止的过程极为迅速,从而保留有连续脊丘与线槽等特殊流体性质下的堆积地貌形态。研究认为,地震发生后受源区斜坡结构所控制产生明显的解体与破坏,按照由前至后的序列下滑运移,受滑体自身势能条件控制,自源区而下的滑体在堆积过程中产生了由左至右、由近及远的叠加堆积过程,这是尼续村滑坡堆积范围向下游明显偏转的主要原因。
英文摘要
: The Nixu landslide is located in the middle of the Yadong-Gulu Rift Valley in southern Tibet. The landslide is developed on the edge of the open uplift basin and its movement is flat along the way.It is a typical "flat" rocky long-runout landslide.The accumulation and evolutionary sequence is completely preserved.Investigation and research on the failure and accumulation structures of Nixu landslide will help to further reveal the evolutionary dynamic mechanism of high-speed debris flow movement and accumulation.This project carried out a detailed ground survey of the Nixu landslide, combined with geophysical methods, revealed and explained the failure characteristics of the sliding surface at the bottom of the source area and the mechanism of the formation of the landslide.The remote sening interpretaion and particle test were used to reveal the spatial distribution rules of various stacked structures.According to the research, it is proposed that the formation and evolution of debris flow in Nixu landslide can be divided into three sections:structure fragmentation in the slope section of the source area,the material structure debrisification in the sliding zone ,the debris flow fluidization movement and accumulation in the leading edge.
下一条：川藏高山峡谷区线性工程地质灾害综合遥感早期识别研究--以巴塘-芒康段为例
【关闭】
