【摘要】 以‘5.12’汶川地震灾区典型斜坡岩体组合结构为模拟特征,采用水平层状上硬下软和上软下硬两种岩性组合概念模型,设计并完成了1:100比尺的大型振动台试验。在基本满足相似律的基础上,试验在模型底部输入了不同类型、激振方向和振幅的激励波。根据试验宏观现象显示,斜坡模型的变形破坏特征与地震动参数、岩性组合结构密切相关,其破坏具有累积效应且受层面控制,上软下硬斜坡模型沿层面形成高位滑坡,呈"拉-剪"破坏模式,而上硬下软斜坡模型沿更深层面形成整体式崩塌,在破坏前并无明显的控制裂缝,其破坏时间相对落后于上软下硬斜坡模型。更多还原

【Abstract】 Based on prototype slopes in disaster areas of ’5·12 ’ Wenchuan Earthquake,two types of horizontally layered model slopes including hardness-upward or softness-upward,are designed to do the large-scale shaking table test with the geometric scale of 1:100.Following the law of similitude,the seismic responses of model slopes could be investigated with different input wave kinds,frequencies,excitation directions and amplitudes.The macro phenomena indicate that;the deformation and failure processes were dependent on seismic parameters and lithological combinations,they demonstrated cumulative effect and were controlled by rock layers.The softness-upward model slope occurred a landslide with high potential along the upmost contact surface,and displayed the tension and shear failure mode.By contrast,the hardness-upward model slope occurred a collapse along the deeper contact surface without obvious control cracks beforehand,and its time of failure was behind the softness-upward model slope’s.更多还原