关键词: 斜坡, 岩性组合, 振动台试验, 变形破坏特征, 破坏机制

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

Key words: slope, lithological combinations, shaking table test, deformation and failure characteristics, failure mechanism