云南黄坪库区滑坡运动及其失稳模式的离散元模拟  

Discrete element numerical simulation and analysis of Yunnan Huangping Reservoir Areas landslide and its failure mode

作　　者：蒋权 陈希良[1] 肖江剑[1] 邱向东 李攀峰 JIANG Quan;CHEN Xiliang;XIAO Jiangjian;QIU Xiangdong;LI Panfeng(Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhefiang 315201, China;University of Chinese Academy of Sciences, Beijing 100049, China;Chengdu Engineering Corporation Limited, Power Construction Corporation of China, Chengdu, Sichuan 610072, China)

机构地区：[1]中国科学院宁波材料技术与工程研究所,浙江宁波315201 [2]中国科学院大学,北京100049 [3]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《中国地质灾害与防治学报》2018年第3期53-59,共7页The Chinese Journal of Geological Hazard and Control

基　　金：国家高技术研究发展计划(863计划)(2015AA016403)

摘　　要：在蓄水库区,伴随着水库蓄水及可能发生的暴雨天气,往往容易触发库岸坡岩土体失稳,这不仅影响工程建设的实施,还对拦河大坝和周围人民群众的生命财产安全造成严重威胁。本文以溪洛渡水电站黄坪滑坡为例,在野外现场调查的基础上,分析了其滑动的成因和机制,并利用离散元法对其三维滑动过程进行模拟,深入分析了滑坡失稳后的运动状态及规律。结果表明:滑坡体运动过程中,其表面会发生较大变化,且滑坡体会呈现出中间失稳体积较大,两侧失稳体积较小的特征;滑坡内部颗粒分布会发生改变,存在大颗粒运动至滑坡体表面,小颗粒运动到滑坡体底面的现象;滑坡体颗粒的速度和压力在不同位置也会发生改变,存在不同颗粒间速度相差很大,滑坡体内压力分布不均匀的情况;滑坡体颗粒的运动速度、运动距离表现出从后缘到前缘,同一横剖面中表层至底层由大到小分布的规律。In reservoir areas,reservoir storage and potential heavy rain are often easy to trigger the base rock and soil slope instability,which not only affects the implementation of the construction,but also poses a serious threat to the dam and the surrounding people＇s life and property safety. Taking Xiluodu Hydropower Station Huang Ping Landslide as an example,on the basis of field investigation,this paper analyzes the causes and mechanism of the slide,and the 3 D sliding process is simulated by discrete element method,the movement state and law of the landslide are analyzed deeply. The results show that the landslide surface will be changed greatly in the movement process,and the volum of unstable mass of the landslide in the middle is relatively larger while the volume on both sides is smaller; The particle distribution in the interior of the landslide will change. There is a phenomenon that large particles move to the surface of the landslide and the small particles move to the bottom of the landslide; the velocity and pressure of particles in landslide can be changed in different position. The velocity difference between some particles is large,and the pressure distribution in the landslide is uneven; from the trailing edge to the leading edge and from the surface to thebottom in the same cross section,the movement velocity and the distance of the particles of the landslide are distributed from large to small.

关 键 词：库区 滑坡失稳 离散元 

分 类 号：TU473.1[建筑科学—结构工程]