摘要
乌东德坝肩揭露多条结构面,保障坝肩协调变形、稳定对大坝整体安全至关重要。通过建立乌东德大坝三维有限元模型,采用Drucker-Prager屈服准则,分析坝肩结构面对大坝-基础应力、变形工作性态和整体稳定的影响,并从应力均化、变形协调和刚度匹配三方面讨论结构面加固处理效果。计算结果表明:坝肩结构面导致拱端横河向位移增幅明显,坝肩局部岩体位移不协调、应力集中并出现局部屈服。当坝肩结构面采用固结灌浆和平洞置换综合措施,可有效改善坝肩岩体应力、位移分布,大坝整体安全有保障。研究成果可供类似工程加固设计分析参考。
Multiple structural planes are found at the abutments of Wudongde arch dam. It is important for dam compatible deformation to ensure dam overall stability safety. Based on 3D nonlinear finite element,the effect of structural planes on the working performance and stability of Wudongde arch dam is analyzed. The reinforcement effect is discussed from the view of stress homogenization,compatible deformation and stiffness matching. The results show that under the influence of structural planes,the transverse displacement at the abutments increase obviously and local foundation rock deform incompatibly close to structural planes,as well as present stress concentration and local plastic zone. The reinforcement measures,i.e. consolidation grouting and concrete replacement,are able to improve the distribution of stress and deformation. The proposed compatible reinforcement procedure is a valuable tool for improving the reinforcement design and analysis of similar super high arch dams.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2016年第A02期3937-3946,共10页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金资助项目(11272178)
国家重点基础研究发展计划(973)项目(2013CB035902)~~
关键词
水利工程
特高拱坝
坝肩结构面
协调加固
hydraulic engineering
super-high arch dam
abutment structural plane
compatible reinforcement
