Shaking table tests on landfills and identification of progressive damage energy

In order to investigate the damage deformation characteristics of landfills containing drainage layer and liners under earthquake, a large shaking table test on a landfill slope containing drainage layer and liners is carried out, and an energy identification method based on the Hilbert-Huang (HHT) and marginal spectrum is proposed based on the dynamic response law of acceleration at each part of the landfill. The method can be used to identify the overall damage and local damage of the landfill, and the effectiveness of the method is discussed based on the measured displacement. The test results show that at the peak seismic intensity of 0.3g, the peak positive displacement at the foot of the slope and the peak negative displacement in the slope change abruptly. The PSHEA increases with height, and the Hilbert energy of municipal solid waste layer is larger than that of the liners and the drainage layer. At the peak acceleration of the input waves of 0.3g and 0.4g, the shear strength of the drainage liner is low, the interface of partially and fully degraded municipal solid waste is trapped, the PMSA changes abruptly, and the energy transfer is abnormal. The damage of the landfill under earthquake is mainly divided into three stages: 0.1g-0.2g without damage stage; 0.3g-0.4g local damage stage, when the damage starts from the drainage layer and liner system at the inner slope corner; and 0.5g overall damage stage of landfill slope into plastic change. Under 0.3g Taft waves, the drainage layer and liners slip first, and the interface of partially and fully degraded municipal solid waste is damaged at the peak moment. The research results can provide a reference basis for the prediction of deformation damage of landfills under earthquake and the design of their seismic mitigation technology.