Earthquakes are part of the natural cataclysms that are responsible for the destruction of entire cities, causing the deaths of millions of people and often have disastrous economic consequences. Therefore, it is important to consider measures of the intensity of seismic movement in risk analysis (Potential Earthquake Harmfulness ‘PEH’). The purpose of this study is to model the mass of soil under a rockfill embankment in order to evaluate the soil settlement under the effect of an earthquake of Boumerdes (Algeria 2003) using “plaxis” finite element code. The PEH characterizes in our study the Aria intensity IA(t) and the cumulative absolute velocity CAV(t), on the one hand, and on the other hand, empirical correlations between the indicators of harmfulness (PEH) and the settlements under the base of the dike. The correlations thus obtained (Uy-PEH) are slightly influenced by the gravitational loads and a tighter dispersion of the point cloud is observed on the correlations (Uy-IA).
The study of the shear strength parameters of mixtures comprising tire-derived aggregates (TDA) and clay was the main objective of this experimental work. The tests were performed using the direct shear box. First, the test was performed on specimens comprising only clay in its natural state and then on mixtures consisting of clay and TDA in increasing contents. A total of four samples (natural clay and natural clay with 2, 4, and 6% tire-derived aggregates)) were made and tested at three normal stress levels (100, 200, and 300 kPa). Then, Mohr-Coulomb failure envelopes were drawn to determine the internal friction angle and cohesion for all mixes. The results were compared to find the optimum TDA content and to study the stress-strain behavior of the mixtures. It was observed that mixing TDA up to 6% by weight with clay significantly changes the shear strength, and the internal friction angle increases from 27.47 to 59.39º (an increase of 46.25%). However, the cohesion significantly decreases from 45 to 26 kPa (a decrease of 57.77%). On the other hand, it was observed that increasing the TDA content reduces the density and increases the shear strength of the mixtures. Also, the addition of TDA increases the mixture consolidation and deformation level at failure.
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