摘要
国内深厚覆盖层上已建几座高土石坝坝基廊道都出现了开裂及止水破坏的现象,为了研究坝基廊道应力变形规律及抗震安全性,采用基于动力子模型法的三维非线性有限元,对240 m高的长河坝心墙堆石坝的坝基廊道进行了研究,动力计算中坝体材料及覆盖层采用考虑围压效应的Hardin-Drnevich模型,以基于薄层单元形式的接触单元模拟各种接触面。计算结果表明,坝基廊道加速度和动位移等动力反应较小,动力条件下廊道应力较静力条件下有所增大,由于动强度的提高,廊道的应力状态较静力条件没有恶化。
Foundation gallery of several high earth rock dams which have been built on the deep alluvium deposit in China have already been cracked and leaked.In order to explore the stress and deformation law and the seismic safety of the foundation gallery of the dam,three dimensional nonlinear finite element analysis based on the dynamic submodeling method was carried out with the foundation gallery of 240m Changheba dam.The filling materials of this dam and alluvium deposit were simulated by the Hardin-Drnevich constitutive model which could consider the effect of confining pressure.The thin-layer element was used to simulate the contact surfaces.The results demonstrate that the dynamic response of acceleration and dynamic displacement of the gallery is smaller as it located inside the dam.The stress of the gallery under dynamic condition is increased than it under static condition.The longitudinal maximum tensile stress increased 8%at the most.The stress state is not worse as the improvement of the dynamic strength of concrete.
作者
曹学兴
何蕴龙
迟福东
张丹
熊堃
余记远
CAO Xuexing;HE Yunlong;CHI Fudong;ZHANG Dan;XIONG Kun;YU Jiyuan(Huaneng Lancang River Hydropower Co.,Ltd.,Kunming,Yunnan 650214,China;State Key Labortory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan,Hubei 430072,China;Changjiang Survey Planning Design and Research Co.,Ltd.,Wuhan,Hubei 430010,China)
出处
《水利与建筑工程学报》
2018年第6期87-93,共7页
Journal of Water Resources and Architectural Engineering
基金
"十三五"国家重点研发计划项目(2018YFC407105
2018YFC0407003)
云南省创新团队项目(2016HC001)
关键词
坝基廊道
子模型法
围压效应
抗震安全性
foundation gallery
submodeling analysis method
confining pressure effect
aseismic safety
