摘要
采用FLAC^(3D)有限差分计算软件模拟分析土石坝拓宽施工过程中及工后坝体变形和受力特性,揭示新旧坝体间相互作用机制,评价拓宽坝体稳定性。结果表明:新旧坝基之间存在差异沉降,拓宽后坝基底部沉降变形呈“勺形”,最大位移在新建坝基形心下方;新旧坝体界面间土体处于受剪状态,存在滑坡风险;新建坝基对坝体心墙具有挤密作用,可减小渗流作用下坝体水平位移,控制坝顶沉降变形;拓宽后在渗流作用下坝体内土体最大位移区域向上游移动;经稳定性分析,扩建后坝体整体运营良好,安全系数满足规范要求。
The deformations and mechanics characteristics of the widened embankment dam during the construction process and after construction was investigated by using the finite difference calculation software FLAC^(3D),by which the interaction between the new and old dams and stability of the dam were studied.The results showed that the differential settlements between the new and old dam foundations occurred.After being widened,the settlement at the bottom of the dam foundation was spoon in shape,and the largest displacement was observed below the centroid of the newly constructed dam foundation.The soil between the interface of the new and old dam tended to be in the shear state,leading to a possibility of occurrence of landslide.The newly constructed dam exerted a compaction effect on the core wall of the dam,leading to the decrease of the horizontal displacement of the dam under the action of seepage and the settlement of the dam crest.After widening,the maximum displacement area of the soil in the dam moved to upstream under seepage.The stability analysis indicated that the newly constructed dam body operated well,and the safety factor meet the requirements of the specification.
作者
郑俊峰
陈晓燕
马正
陈青
ZHENG Junfeng;CHEN Xiaoyan;MA Zheng;CHEN Qing(Zibo Water Engineering Service Center,Zibo 255000,Shandong,China;Jinan Water Engineering Service Center,Jinan 250099,Shandong,China;Jinan Municipal Engineering Design&Research Institute(Group)Co.,Ltd.,Jinan 250003,Shandong,China)
出处
《山东大学学报（工学版）》
CAS
CSCD
北大核心
2022年第1期85-92,共8页
Journal of Shandong University（Engineering Science）
关键词
土石坝拓宽
水库
变形
稳定性
数值模拟
embankment dam widening
reservoir
deformation
stability
numerical simulation
