Dynamic response and damage mechanism of deep overburden layer slope based on shaking table tests

The mountain areas of southwest China are widely covered with loose fractured rock bodies, which are prone to large-scale landslides under seismic action. It is known that the response of the acceleration amplification factor field is closely related to the seismic damage state of the overburden. In order to study the dynamic response and damage mechanism of overburden layer slopes under seismic action, a deep base-covered slope model containing two layers of stacks is used as a prototype in this study, and a series of shaking-table modeling experiments of progressive damage of earthquake-induced slopes are carried out. The cumulative seismic damage deformation process of the slope overburden was identified based on embedded sensors and Particle Image Velocimetry technology, and the energy transfer mechanism of the process was revealed by Hilbert Huang transform. The results show that the non-coherent motion (vibration frequency difference) between the shallow overburden layer-thick overburden layer-bedrock layer is the main controlling factor inducing the slope landslide, and the damage form of the deep overburden slope manifests itself in the form of the trailing edge sliding and extruding the central shear out. The damage starts from the back edge of the slope with increasing seismic intensity and gradually moves toward the middle to lower part of the slope, while extending from the surface to the deeper part of the slope.