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

Research on the Dynamic Deep Anti-Slide Stability of Gravity Dam under Structure-Foundation Interaction

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.