【摘要】 为探讨深厚覆盖层上堆石坝坝基廊道地震反应规律并评价其抗震安全性,以金平沥青混凝土心墙堆石坝为背景工程,在三维非线性静力分析基础上,采用子模型技术对坝基廊道进行了地震动力时程分析,坝体材料及覆盖层采用Hardin-Drnevich动力本构模型,采用薄层单元模拟各类接触面.计算成果显示,廊道中部动应力反应相对较大,地震过程中其应力变形极值相对静力工况变化较小;设计地震对廊道与两岸灌浆平洞接缝的变形影响不大;坝基廊道与沥青混凝土心墙的连接部位始终处于受压状态,对该部位止水的防渗可靠性有利.总体来说,坝基廊道的抗震安全性是有保障的.更多还原

【Abstract】 To explore the seismic response features of the foundation gallery of rockfill dam on deep overburden and evaluate its seismic safety,Jinping rockfill dam with asphalt concrete core is taken as a studying case.Based on three-dimensional nonlinear static analysis,submodeling method is used to make time-history analysis of the foundation gallery.The filling materials of dam and alluvium deposit are simulated by Hardin-Drnevich dynamic constitutive model.The thin-layer contact element is used to simulate the contact surfaces.The results indicate that the dynamic stresses show a stronger response in the middle of the gallery.During the seismic history,the deformation and stress extremums of the gallery were basically invariant compared to the static state.The design seismic load has little effect on the structure joints between the gallery and grouting adit.The joint section between foundation gallery and asphalt concrete core is always in compression during the seismic history;it is beneficial to the reliability of the water stop structure in that region.In sum the earthquake resistance safety of the foundation gallery is verified.更多还原