考虑键槽咬合作用的高拱坝非线性横缝模型研究  

A nonlinear transverse joint model of high arch dams considering the interaction of shear keys

作　　者：彭刚[1,2] 洪海丰 陈灯红[1,2] 杨紫辉 赵艺园 曹文昱 PENG Gang;HONG Haifeng;CHEN Denghong;YANG Zihui;ZHAO Yiyuan;CAO Wenyu(Hubei Key Laboratory of Disaster Prevention and Mitigation,China Three Gorges University,Yichang 443002,China;College of Civil Engineering and Architecture,China Three Gorges University,Yichang 443002,China;College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡大学防灾减灾湖北省重点实验室,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]三峡大学水利与环境学院,湖北宜昌443002

出　　处：《振动与冲击》2022年第20期216-224,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金(52079072)。

摘　　要：为了精确模拟高拱坝横缝键槽在地震作用下的力学响应,研究了高拱坝横缝键槽咬合作用,并构建了一种带附加切向弹簧刚度的平缝模型。通过调节平缝模型的附加切向弹簧刚度系数可以实现与精细化模型精度相当的咬合作用,并探讨了该模型附加切向刚度系数的取值及其稳定性。将锦屏一级高拱坝作为工程算例,重点研究了键槽咬合作用对横缝的法向开度和切向位移的影响。结果表明:联结单元引入到动接触边界模型,不仅能较好地模拟键槽咬合作用,而且能改善单一动接触力模型的两侧坝体互相嵌入。键槽咬合作用能够加强拱坝的整体性,有效地限制横缝的切向位移,并使横缝的法向开度小幅降低。In order to accurately simulate the mechanical response of the shear keys of the transverse joint of a high arch dam under the seismic action,the interaction of shear keys of transverse joints in high arch dams was studied,and a flat joint model with additional tangential spring stiffness was constructed in this paper.By adjusting the additional tangential spring stiffness coefficient of the flat joint model,the interaction effect equivalent to the precision of the refined model could be achieved,and the value and stability of the additional tangential stiffness coefficient of the model were discussed.Taking the Jinping I high arch dam as an engineering example,the influence of interaction of shear keys on the normal opening and tangential displacement of the transverse joints was investigated.Results show that the introduction of the coupling element into the dynamic contact boundary model can not only simulate the interaction of shear keys,but also improve the embedding of the arch dams on both sides of the single dynamic contact force model.The interaction of shear keys can strengthen the integrity of the arch dam,effectively limit the tangential displacement of the transverse joints,and slightly reduce the normal opening of the transverse joints.

关 键 词：横缝 键槽咬合 附加切向弹簧刚度 法向开度 切向位移 

分 类 号：TV642[水利工程—水利水电工程] TV31