摘要
鉴于工程中出现的越来越多的高陡堆石边坡工程,其稳定性、失稳过程、影响范围对工程的运行安全至关重要,采用离散元数值模拟方法开展高陡堆石边坡失稳过程模拟。以某抽水蓄能电站工程为例,建立高陡堆石边坡离散元模型,通过模拟极限工况下的边坡失稳过程,分析该高堆石边坡的堆石运动、挡墙受力以及边坡整体变化情况。根据平均不平衡力比,将堆石边坡失稳过程划分为5个阶段,并重点分析各阶段内边坡体型、堆石位移、堆石速度等的变化;通过监测堆石边坡能量、挡墙受力等变化情况,进一步揭示堆石边坡的失稳机制;通过对比初始状态和失稳后块石位移与越过特定位置的块石数量,论证挡墙措施的阻滑作用;结合到达河床底部的颗粒数量和挡墙受力变化情况,认为堆石边坡底部的混凝土挡墙迫切需要加强,通过对高陡堆石边坡进行离散元数值模拟,明确了边坡失稳过程、影响范围,并提出了混凝土挡墙的建议高度。
Since more and more high and steep rockfill slopes appear in engineering,the stability,failure process and influence range are critical to the engineering operation safety.The discrete element method was used to simulate the failure process of a high and steep rockfill slope.Taking a pumped storage power station project as an example,a discrete element model was established,and the failure process under the limit condition was simulated.The movement,retaining wall stress and change of the slope were analysed in detail.According to the variation of the average unbalanced force ratio,the failure process of the rockfill slope can be divided into five stages.The change of slope shape,displacement and velocity in each phase were mainly analysed.Besides,the instability mechanism of the rockfill slope was further clarified by monitoring the energy change and the stress change of the concrete retaining wall.Comparing with the displacement of accumulation body and the number of rock blocks crossing the specific position,the protection effect of the retaining wall was demonstrated.Furthermore,through quantitative analysis of the number of rock blocks reaching the riverbed and the force changes on the retaining wall,the concrete retaining wall at the bottom of the rockfill slope should be strengthened urgently.Through the discrete element numerical simulation,the failure process and influence range of the high and steep rockfill slope are defined and the suggested height of the concrete retaining wall is proposed.
作者
郑成成
龙小刚
胡广柱
袁祥
马春辉
李高超
ZHENG Chengcheng;LONG Xiaogang;HU Guangzhu;YUAN Xiang;MA Chunhui;LI Gaochao(Shaanxi Zhen’an Pumped Storage Co.,Ltd.,Xi’an 710061,China;School of Water Resources and Hydropower,Xi’an University of Technology,Xi’an 710048,China;State Key Laboratory of Eco-hydraulics in Northwest Arid Region of China,Xi’an University of Technology,Xi’an 710048,China)
出处
《水利水电科技进展》
CSCD
北大核心
2021年第6期92-98,共7页
Advances in Science and Technology of Water Resources
基金
国家自然科学基金(51809212)
陕西省自然科学基础研究计划重点项目(2018JZ5010)
陕西省水利科技计划项目(2018SLKJ-5)。
关键词
高陡边坡
堆石边坡
离散元
失稳过程模拟
抽水蓄能电站
high-steep slope
rockfill slop
discrete element method
failure process simulation
pumped storage power station
