To evaluate the multidirectional seismic behaviour of reinforced sandy slopes and to assess the effects of seismic
loading directions, a pile-stabilized slope is subjected to one, two and three-dimensional seismic loading combinations.
Small-scale physical models of a biaxial shaking table and three-dimensional numerical models were
implemented using the 3D explicit finite difference method. Seismic loading was imposed on the numerical
models in two frameworks: (1) high frequency sinusoidal harmonic excitations to simulate the physical models
and (2) earthquake loading. Both near-fault and far-field earthquake records were used in the numerical modeling.
The results show that the permanent lateral displacement of the slope has the highest value among the
combination of the longitudinal, transverse, and vertical components (i.e., LTV) of earthquake records. Findings
have also revealed a simple logarithmic relationship between some intensity measures (IMs) and the lateral
displacement of a reinforced sandy slope.