摘要
本文采用平面非线性有限元方法,分析沙湾水电站一期围堰双高塑性混凝土防渗墙的应力变形特性。采用邓肯·张E-B模型模拟土体和塑性混凝土的本构关系,采用Goodman模型模拟墙体与周围土体的相互接触作用,采用改进的Mana方法模拟围堰基坑的逐级开挖过程,采用逐级增量法模拟围堰填筑、防渗墙修建、基坑开挖抽水等整个施工过程。计算结果表明墙体的应力变形具有良好的规律性;推测原墙的破坏主要由于过程控制等因素引起;并对新墙设计提出合理建议。
This paper analyzes the stress and deformation of a plastic concrete cutoff wall of Shawan cofferdam by plane nonlinear FEM,adopting Duncan and Chang’s E-B model for stress-strain relationship of plastic concrete and soil,Goodman model for interfacial behavior between the wall and surrounding soil,and the improved Mana method for the process of pit excavation and water pumping. The whole construction flow is tracked by increment course. Results show a good regulation of stresses and deformation. This study reveals that the failure of old cutoff wall could be caused by construction process control and some other factors,and suggests a new cutoff wall design.
出处
《水力发电学报》
EI
CSCD
北大核心
2010年第2期197-203,189,共8页
Journal of Hydroelectric Engineering
关键词
水工结构
应力变形
非线性有限元
防渗墙
塑性混凝土
hydraulic structure
stress and deformation
nonlinear finite element method
cutoff wall
plastic concrete
