逆层岩质边坡地震动力破坏离心机试验研究

发布时间：2018-02-01 00:16

本文关键词： 逆层岩体边坡动力离心机模型试验次级节理　出处：《岩土工程学报》2014年04期 　论文类型：期刊论文

【摘要】：使用相似材料分别制作了只含有非连续的层面和同时含有非连续的层面和非贯通的次级节理逆层岩体边坡小比例物理模型,进行离心机动力试验,研究边坡的动力响应和破坏机理以及非连续层面和次级节理对其的影响。试验结果证明:逆层岩体边坡地形放大效应受地震动力输入频率和振幅影响显著;次级节理对逆层边坡动力稳定性影响很大,含有次级节理的逆层岩体边坡动力稳定性明显低于不含次级节理的逆层岩体边坡;两种逆层边坡的破坏模式存在很大的区别,不含次级节理的边坡破坏从坡脚开始依次向后产生岩层的弯折破坏,而含有次级节理的边坡破坏从坡体中后部开始依次向坡脚岩层产生贯通破坏,贯通破坏面倾角明显高于不含次级节理边坡,并且呈明显的台阶状。
[Abstract]:Using similar materials, a small scale physical model of rock slope with only discontinuous layer and discontinuous layer and discontinuous layer is made, and the centrifuge dynamic test is carried out. The dynamic response and failure mechanism of the slope and the influence of discontinuous plane and secondary joints on the slope are studied. The experimental results show that the topographic amplification effect of the inverse rock slope is significantly affected by the frequency and amplitude of seismic dynamic input. The influence of secondary joints on the dynamic stability of inverse rock slope is very great. The dynamic stability of inverse rock slope with secondary joint is obviously lower than that of inverse rock slope without secondary joint. The failure modes of the two kinds of inverse slope are very different. The failure of slope without secondary joint produces the bending failure of rock layer from the foot of the slope in turn. The failure of slope with secondary joints starts from the middle and back of the slope to the rock layer at the foot of the slope in turn. The slope inclination of the failure plane is obviously higher than that of the slope without the secondary joint, and the slope shows an obvious step shape.
【作者单位】：中国地质大学(武汉)工程学院;中国地质环境监测院;
【基金】：国家科技支撑计划课题(2011BAK12B09)
【分类号】：TU435
【正文快照】： 0引言岩质边坡在地震动力作用下产生的破坏是地震诱发的一类常见地质灾害,逆层岩体边坡受到优势层面和正交次级节理的控制,在地震过程中可能产生整体的倾倒崩塌破坏,是地震诱发岩质边坡破坏的重要组成部分。由于地震的突发性和不可预测性,关于地震发生时刻岩土边坡的动力响应

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