摘要
库岸滑坡堆积体在降雨的作用下容易产生变形破坏现象,严重威胁了库区的正常运行及居民生命财产安全。以RD滑坡为研究对象,根据现场调查结果建立滑坡颗粒流数值模型,基于离散元法PFC3D与室内试验结果进行了细观参数标定,并预测了降雨条件下RD滑坡失稳过程及运动特征。结果表明:滑坡变形过程持续时间约为54 s,分为3个阶段:触发加速阶段、减速变形阶段和滑坡停止阶段。滑坡最大平均位移3.8 m,最大平均速度1.48 m/s,变形分布于坡体中部,最大位移约为55 m,潜在破坏模式为圆弧型破坏。模拟了RD滑坡潜在的破坏变形过程,明确了该滑坡在全饱和状态下的潜在破坏模式和运动特征,为类似库岸滑坡的防灾减灾及风险预测提供了参考。
The colluvial deposits of reservoir slopes are prone to deformation and failure under the influence of rainfall,posing a serious threat to the normal operation of the reservoir area and the safety of residents.This paper takes the RD landslide as the research object,establishes a numerical model of the landslide particle flow based on field investigation results,calibrates the microscopic parameters by combining the discrete element method PFC3D with indoor experimental results,and predicts the instability process and movement characteristics of the RD landslide under rainfall conditions.The results show that the duration of the landslide deformation process is about 54 s,divided into three stages:trigger acceleration phase,deceleration deformation phase,and landslide cessation phase.The maximum average displacement of the landslide is 3.8 m,with a maximum average velocity of 1.48 m/s.The deformation is distributed in the middle of the slope,with a maximum displacement of about 55 m,indicating a potential circular arc failure mode.This paper simulates the potential failure deformation process of the RD landslide,clarifies its potential failure mode and movement characteristics under fully saturated conditions,and provides a reference for disaster prevention,mitigation,and risk prediction of similar reservoir bank landslides.
作者
张华庆
董梦龙
张发明
黄跃祖
李院忠
赵玉滨
ZHANG Huaqing;DONG Menglong;ZHANG Faming;HUANG Yuezu;LI Yuanzhong;ZHAO Yubin(School of Earth Sciences and Engineering,Hohai University,Nanjing,Jiangsu 211100;PowerChina Beijing Engineering Corporation,Beijing 100024)
出处
《中国煤炭地质》
2025年第4期44-50,共7页
Coal Geology of China
基金
中国电建集团北京勘测设计研究院有限公司科研项目(824144016)
中央高校基金项目(1071/423061)。
关键词
滑坡
破坏机理
运动特征
离散元法
数值模拟
landslide
failure mechanism
motion characteristics
discrete element method
numerical simulation
作者简介
第一作者:张华庆(2001-),男,在读硕士研究生,从事边坡、滑坡稳定性评价等研究工作。E-mail:231309080030@hhu.edu.cn;通讯作者:董梦龙(1988-),男,博士,讲师,从事岩体结构与工程稳定、地质灾害评价等研究工作。E-mail:dongml@hhu.edu.cn。
