层状岩质边坡动力变形破坏特征的试验研究

Experiments on Dynamic Deformation and Failure of Layered Rock Slope

以反倾层状岩质边坡为研究对象,通过振动台试验对地震作用下反倾层状岩质边坡的变形破坏过程进行了研究,观察记录了在不同频率、振幅、持时地震波作用下模型边坡的宏观变形破坏特征。在此基础上,对模型边坡的变形破坏模式进行了分析。试验结果表明:地震作用下边坡变形破坏特征与地震动参数密切相关;结构面对边坡的变形破坏有着控制作用;地震作用下反倾层状岩质边坡的变形破坏模式可概化为:地震诱发——顶部及浅表部松动变形——坡体裂缝发育、扩展及层间错动加剧——顶部及浅表部破坏加剧——坡脚拉张裂缝扩展及层间错动加剧,引起边坡大规模崩塌溃坏,散落岩体堆积坡脚。

Taking an anti-dip layered rock slope as an example,the deformation and failure process of an anti-dip layered rock slope under the earthquake is analyzed by shaking table test.The characteristics of macroscopic deformation and failure of the model slope under the seismic waves with different frequencies,excitation intensities and holding times are observed and recorded.And the deformation and failure modes of the model slope are analyzed as well.The results show that the characteristics of deformation and failure of the slope under the earthquake are closely related to the parameters of earthquake ground motion.The structural plane has a controlling effect on the deformation and failure of the slope.The deformation and failure modes of the anti-dip layered rock slope under the earthquake can be generalized as follows earthquake induction,the top and shallow parts loose deformation,cracks growth and development and interlayer dislocation.The top and shallow parts damage increased;stretch fractures of the slope toe expansion and interlayer dislocation increased;large-scale collapse and scattered rock mass accumulation at the slope toe.