考虑结构—地基交互作用的重力坝深层抗滑动力稳定性研究
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摘要
我国大坝多建于高地震区域的中西部地区,对其进行抗震分析十分必要。文章以重力坝为研究对象,考虑到坝基岩体多存在软弱结构面和缓倾角裂隙等,着重研究地震作用时的重力坝深层抗滑稳定性。为了反映无限地基对结构的影响,文章采用在结构-地基交界面处附加弹簧和阻尼的方式进行处理,其中,在确定弹簧刚度和阻尼参数时采用了阻尼抽取法。这样处理就可以采用较小的计算区域,不仅可以降低动力分析的计算量,而且计算精度也得以提高。
As most dams are built in the mid-west area in our country where earthquake occurs frequently,it is necessary to analyze the anti-earthquake performance of dam.In the article,the gravity dam is taken as the subject of research. The deep anti-slide stability of gravity dam under the action of earthquake is studied emphatically as the weak structural surface and low inclined seam at dam foundation are taken into account.The way of additional springs and dampers linked to the structure-foundation interface is introduced to reflect the action of infinite foundation to structure,and the damping-solvent extraction is utilized to determine the parameter of the additional springs and dampers.A small calculation area can be adopted to calculate the dynamic responses of structure,and can reduce calculation effort and improve calculation precision of the dynamic dam stability.
As most dams are built in the mid-west area in our country where earthquake occurs frequently,it is necessary to analyze the anti-earthquake performance of dam.In the article,the gravity dam is taken as the subject of research. The deep anti-slide stability of gravity dam under the action of earthquake is studied emphatically as the weak structural surface and low inclined seam at dam foundation are taken into account.The way of additional springs and dampers linked to the structure-foundation interface is introduced to reflect the action of infinite foundation to structure,and the damping-solvent extraction is utilized to determine the parameter of the additional springs and dampers.A small calculation area can be adopted to calculate the dynamic responses of structure,and can reduce calculation effort and improve calculation precision of the dynamic dam stability.
引文
[1]任灏,张丽萍.刚体极限平衡法的重力坝深层抗滑稳定分析[J].山西建筑,2009,35(31):358-359.
[2]王义锋,章青.基于界面元法的向家坝重力坝深层抗滑稳定分析[J].灾害与防治工程,2009,30(9):2691-2695.
[3]周伟,常晓林,徐建强.基于分项系数法的重力坝深层抗滑稳定分析[J].岩土力学,2007,28(2):315-320.
[4]Hou MX.,Ge XR.Stability analyses of the three gorgesdam foundation against sliding by strength reduction of fi-nite elements[J].Key Engineering Materials,2007,340:1315-1320.
[5]Si JH.Jian Z.,Chen X.Application of strength reductionFEM in anti-sliding stability at dam foundation[C].2009WRI World Congress on Computer Science and InformationEngineering,CSIE 2009,1:751-754.
[6]Tafreshi SN.Numerical simulation of pile-soil-struc-ture interaction under dynamic loading[C].Proceedingsof the 2010 GeoShanghai International Conference,2010,205:96-103.
[7]Ryu JS.,Seo CG.Seismic response analysis of soil-structure interactive system using a coupled three-di-mensional FE-IE method[J].Nuclear Engineering andDesign,2010,240(8):1949-1966.
[8]陈健云,李建波,林皋,马秀平.结构-地基动力相互作用时域数值分析的显-隐式分区异步长递归算法[J].岩石力学与工程学报,2007,26(12):2481-2487.
[9]George DGD.Beskos DE.Soil-structure interaction ef-fects on seismic inelastic analysis of 3-D tunnels[J].SoilDynamics and Earthquake Engineering,2010,30(9):851-861.
[10]顾淦臣.土石坝地震工程.南京:河海大学出版社.1988.
[2]王义锋,章青.基于界面元法的向家坝重力坝深层抗滑稳定分析[J].灾害与防治工程,2009,30(9):2691-2695.
[3]周伟,常晓林,徐建强.基于分项系数法的重力坝深层抗滑稳定分析[J].岩土力学,2007,28(2):315-320.
[4]Hou MX.,Ge XR.Stability analyses of the three gorgesdam foundation against sliding by strength reduction of fi-nite elements[J].Key Engineering Materials,2007,340:1315-1320.
[5]Si JH.Jian Z.,Chen X.Application of strength reductionFEM in anti-sliding stability at dam foundation[C].2009WRI World Congress on Computer Science and InformationEngineering,CSIE 2009,1:751-754.
[6]Tafreshi SN.Numerical simulation of pile-soil-struc-ture interaction under dynamic loading[C].Proceedingsof the 2010 GeoShanghai International Conference,2010,205:96-103.
[7]Ryu JS.,Seo CG.Seismic response analysis of soil-structure interactive system using a coupled three-di-mensional FE-IE method[J].Nuclear Engineering andDesign,2010,240(8):1949-1966.
[8]陈健云,李建波,林皋,马秀平.结构-地基动力相互作用时域数值分析的显-隐式分区异步长递归算法[J].岩石力学与工程学报,2007,26(12):2481-2487.
[9]George DGD.Beskos DE.Soil-structure interaction ef-fects on seismic inelastic analysis of 3-D tunnels[J].SoilDynamics and Earthquake Engineering,2010,30(9):851-861.
[10]顾淦臣.土石坝地震工程.南京:河海大学出版社.1988.
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