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重庆大学土木工程学院,重庆,400045
Published:2021
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陈志雄,杨鹏,仉文岗,刘汉龙.地震对散粒体滑坡堆积体形态影响的模型试验研究∗[J].防灾减灾工程学报,2021,(2):211-220
Chen Zhixiong. Model Experimental Study of Granular Landslide under Vibration Conditions[J]. 2021, (2): 211-220.
考虑地震波输入的情况下,运用美国 ANCO 公司地震模拟振动台系统开展室内小尺寸的模型实验,研究在不同的振动方向和振动频率下,滑坡-碎屑流的堆积规律。实验发现,振动方向对堆积体的形状影响显著,振动方向为水平时,冲程的值比振动方向为竖直时的值要大,而堆积宽度和厚度的值却比振动方向竖直时要小。振动频率对于散粒体的堆积分布影响显著;在不同的振动方向上,水平和竖直两种振动方向对于堆积体的各个特征影响互有差异。
A small-scale shaking table model test was carried out to investigate the characteristics and regularities of the granular landslide deposits under influences of different vibration frequencies and orientations. The sliding granule was subjected to the horizontal and vertical seismic waves. The maximum displacement of the debris,as well as the width,thickness and distribution area of the deposit was measured. Results indicate that the deposit shape is significantly influenced by the excitation frequency. The maximum displacement of granule and the width,thickness and area of the deposit increase with enhanced frequency when a horizontal vibration is exerted. The maximum displacement of granule is relatively small and the deposit width and thickness are larger when the vibration orientation is vertical. This study summarizes the characteristics and regularities of landslide deposits under different vibration frequencies and orientations through the model test and provides preliminary guidelines for design of engineering protective structures.
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