The durability against wet-dry (w-d) cycles is an important parameter for the service life design of solidified permeable reactive barrier (PRB) waste. This study introduces the potential use of cement, fly ash, and carbide slag (CFC) for the stabilization/solidification (S/S) of PRB waste. In this study, solidified PRB waste was subjected to different w-d cycles ranging in times from 0 to 10. By analyzing the mass loss, the unconfined compressive strength (UCS), initial resistivity (IR), and the ${\mathrm{Mn}}^{2+}$ leaching concentration under different durability conditions, the results demonstrate that these variables increased and then tended to decrease with the number of w-d cycles. The UCS of contaminated soil is significantly correlated with IR. Moreover, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and X-ray diffraction (XRD) analyses indicate that the hydration products calcium silicate hydrate (C-S-H) and ettringite (AFt) are the main reasons for the enhancement of the UCS. However, the increase in ${\mathrm{Mn}}^{2+}$ concentration leads to a decrease in hydration products and the compactness of solidified soil, which has negative effects for the UCS and the leaching ion concentration. In general, the durability exhibited by the PRB waste treated with S/S in this paper was satisfactory. This study can provide theoretical guidance for practical engineering applications.

Seismic activities often trigger catastrophic events including collapses and rockfalls on rocky slopes. This research endeavors to understand the dynamic behavior and damage modes in uniform rocky slopes with unstable rock masses. To achieve this objective, the paper constructs a physical model of uniform rocky slope with unstable rock mass and performs triaxial loading shaking table tests. Subsequently, the seismo-dynamic responses and associated damage modes of the slope are scrutinized, and the initiation and deformation mechanisms of the hazardous rock are revealed. Further, we obtained the marginal spectral energy evolution characteristics of measurement points of both the unstable rock and bedrock. This deciphers the damage evolution characteristics of the weak structural plane. The results indicate that there are distinct elevation and surface amplification effects within the rock slopes, which systematically lessened with increasing seismic intensity. The vertical deformation of unstable rock mass is more sensitive to high seismic intensity. The seismic-induced initiation process of unstable rock masses is split into three stages: trailing edge tension cracking, sliding damage of structural planes, and a complete failure of structural plane shear capacity. It is also established that the Hilbert and marginal spectra effectively identified the damage process of unstable rock masses containing weak structural planes.