Failure modes of slope stabilized by frame beam with prestressed anchors

Abstract

A large scale shaking table test was carried out to study the failure modes of the slope stabilized by frame beam with prestressed anchors. Based on the Hilbert–Huang Transform (HHT), the damage identification analysis was performed by using the marginal spectrum obtained from the acceleration responses. The results from the tests show that the seismic damage of the slope stabilized by the frame beam with prestressed anchors mainly occurs at the top of the sliding mass and on the free surface of the slope. The upper part of the sliding layer begins to damage under the seismic excitation with low amplitudes. Because of existing anchor cable and frame beam, the middle and lower parts of the slope display better seismic performance. The seismic failure mode of the slope stabilized by frame beam with prestressed anchors is mainly expressed by the penetration of tensile cracks and longitudinal cracks at the top of the sliding mass, collapse and hollowing of free surface at the upper part of the slope, and overall slippage of sliding mass. The slope has an elevation amplification effect on the amplitude of the Hilbert energy spectrum and changes the time-frequency distribution of the energy spectrum.