观音岩水电站混合坝插入式接头的抗震性能
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摘要
观音岩水电站混合坝插入式接头高度达71,m,是大坝结构的薄弱环节,接头的动静安全直接关系到工程全局.以薄层单元模拟插入式接头中堆石坝心墙与混凝土的接触面,堆石和心墙料采用Hardin非线性动力本构模型,在三维非线性静力分析基础上,基于时程法对大坝连接坝段进行了地震动力分析,揭示了在地震过程中接头部位接触面的开合变形性态、剪切破坏及地震永久变形情况.三维非线性仿真分析的结果表明:在设防烈度地震作用下,土质防渗体与混凝土坝接触面仅在靠近顶部和两侧部位发生一定张开,张开度较小,张开持续时间短,接触面并未形成贯通的张开面;接触面剪切破坏范围较小,顶部具有一定程度的永久变形.综合来看,插入式接头的抗震安全性是有保障的.
The inserted junction in the composite dam of Guanyinyan hydropower station,with the height of 71 m,is the weak point of the dam structure,and its static and seismic safety of the junction directly influences the safety of the whole project.Thin-layer element was used to simulate the contact surfaces between the core and concrete in the junction and the rockfill and gravelly soil core were simulated by Hardin nonlinear dynamic constitutive model.Based on 3-dimensional nonlinear static analysis,time-history analysis was carried out to explore the earthquake-resistant characteristics of the inserted junction and to study the detachment,shear break and seismic residual deformation of the contact surfaces in detail.Three-dimensional nonlinear simulation results show that only the top and edges of the two contact surfaces show detachments,which are small,for a short time and do not extend through the contact surfaces,during the earthquake with fortification intensity.The shear break areas are small,with some seismic residual deformations on the top.In sum the earthquake resistance of the inserted junction is verified.
The inserted junction in the composite dam of Guanyinyan hydropower station,with the height of 71 m,is the weak point of the dam structure,and its static and seismic safety of the junction directly influences the safety of the whole project.Thin-layer element was used to simulate the contact surfaces between the core and concrete in the junction and the rockfill and gravelly soil core were simulated by Hardin nonlinear dynamic constitutive model.Based on 3-dimensional nonlinear static analysis,time-history analysis was carried out to explore the earthquake-resistant characteristics of the inserted junction and to study the detachment,shear break and seismic residual deformation of the contact surfaces in detail.Three-dimensional nonlinear simulation results show that only the top and edges of the two contact surfaces show detachments,which are small,for a short time and do not extend through the contact surfaces,during the earthquake with fortification intensity.The shear break areas are small,with some seismic residual deformations on the top.In sum the earthquake resistance of the inserted junction is verified.
引文
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[4]Goodman R E,Taylor R E,Brekke T.A model for the mechanics of jointed rock[J].Journal of Soil Mechanics and Foundation Division,ASCE,1968,94(3):637-659.
[5]Desai C S,Zaman M M,Lightner J G,et al.Thin-layer element for interfaces and joints[J].International Jour-nal for Numerical and Analytical Methods in Geome-chanics,1984,8:19-43.
[6]殷宗泽,朱泓,许国华.土与结构材料接触面的变形及数学模拟[J].岩土工程学报,1994,16(3):14-22.Yin Zongze,Zhu Hong,Xu Guohua.Numerical simula-tion of the deformation in the interface between soil and structural material[J].Chinese Journal of Geotechnical Engineering,1994,16(3):14-22(in Chinese).
[7]Bandis S C,Lumsden A C,Barton N R.Fundamentals of rock joint deformation[J].International Journal of Rock Mechanics and Mining Sciences,1983,20(6):249-268.
[8]朱伯芳.有限单元法原理与应用[M].北京:中国水利水电出版社,1998.Zhu Bofang.The Finite Element Method Principle and Application[M].Beijing:China Water Power Press,1998(in Chinese).
[9]Clough G W,Duncan J M.Finite element analysis of retaining wall behavior[J].Journal of Soil Mechanics and Foundation Engineering Division,ASCE,1971,97(12):1657-1673.
[10]Duncan J M,Zhang C Y.Nonlinear analysis of stress and strain in soils[J].Journal of Soil Mechanics and Founda-tion Division,1970,96(SM5):1629-1653.
[11]顾淦臣.土石坝地震工程[M].南京:河海大学出版社,1989.Gu Ganchen.Earthquake Engineering of Earth and Rockfill Dams[M].Nanjing:Hehai University Press,1989(in Chinese).
[12]Serff N,Seed H B,Makdisi F I,et al.Earthquake Induced Deformation of Earth Dams[R].EERC-76-4.Berkeley:Earthquake Engineering Research Center,University of California,1976.
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