某面板堆石坝防渗墙内力与变形特性研究
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摘要
基于某面板堆石坝工程,运用有限元数值分析法,就大坝完建情况、蓄水情况和地震情况,对地基、坝体和防渗墙分别进行数值仿真计算,分析了深厚河床冲积层上防渗墙应力与变形的大小和分布规律;通过有限元内力法,求解了防渗墙内力分布,并通过特征截面的配筋计算,分析了防渗墙强度的主控因素,为防渗墙的结构设计和强度设计提供了依据和参考,同时也表明有限元数值分析和有限元内力法是研究复杂情况下的面板堆石坝防渗墙特性的有效途径。
Based on a face rockfill dam, the numerical simulation of foundations, dams, and impervious walls was performed by using finite element numerical analysis method under dam completion conditions, water storage conditions, and earthquake conditions. The size and distribution of stress and deformation of cut-off walls on alluvial beds in deep riverbed were obtained and analyzed. The finite element internal force method was used to solve the internal force distribution of the impervious wall. Through the calculation of the reinforcement of the characteristic cross section, the main controlling factors of the strength of the impervious core wall were analyzed,which provided the basis and reference for the structural design and strength design of the impervious core wall. At the same time, it also shows that finite element numerical analysis and finite element internal force method are effective ways to study the characteristics of the seepage wall of face rockfill dam under complex conditions.
Based on a face rockfill dam, the numerical simulation of foundations, dams, and impervious walls was performed by using finite element numerical analysis method under dam completion conditions, water storage conditions, and earthquake conditions. The size and distribution of stress and deformation of cut-off walls on alluvial beds in deep riverbed were obtained and analyzed. The finite element internal force method was used to solve the internal force distribution of the impervious wall. Through the calculation of the reinforcement of the characteristic cross section, the main controlling factors of the strength of the impervious core wall were analyzed,which provided the basis and reference for the structural design and strength design of the impervious core wall. At the same time, it also shows that finite element numerical analysis and finite element internal force method are effective ways to study the characteristics of the seepage wall of face rockfill dam under complex conditions.
引文
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[11]USBR[N.R.4].State of Practice for Nonlinear Analysis of Concrete Dams at the Bureau of Reclamation[S].
[2]周厚德,介玉新.基于有限元的弯矩计算中若干问题探讨[J].岩土力学,2007,28(S1):300-304.
[3]中华人民共和国水利部.水工混凝土结构设计规范:SL 191-2008[S].北京:中国水利水电出版社,2008.
[4]郑秀培.土坝地基粘土混凝土防渗墙的结构计算[J].水利水电技术,1962(11):13-20.
[5]李青云,程展林.三峡工程二期围堰运行后的性状分析[J].岩土工程学报,2005(04):410-413.
[6]胡黎明,濮家骝.三峡二期上游围堰三维有限元应力应变分析[J].清华大学学报(自然科学版),2001(S1):240-243.
[7]郦能惠,米占宽,李国英,等.冶勒水电站超深覆盖层防渗墙应力变形性状的数值分析[J].水利水运工程学报,2004(1):18-23.
[8]束加庆,任旭华.结构任意截面内力求解的有限元内力法[J].三峡大学学报(自然科学版),2008(3):49-52.
[9]张伟,伍鹤皋.调压井钢筋混凝土衬砌的有限元配筋法[J].中国农村水利水电,2007(11):109-111,115.
[10]中华人民共和国国家发展和改革委员会.碾压式土石坝设计规范:DL/T 5395-2008[S].北京:中国电力出版社,2008.
[11]USBR[N.R.4].State of Practice for Nonlinear Analysis of Concrete Dams at the Bureau of Reclamation[S].