Seismic responses of vertical-faced wrap-around reinforced soil walls

摘要

A series of shaking table tests on geosynthetic-reinforced walls with a height of H= 0.6 m is performed to investigate the seismic performance of prototype walls with H= 6 m. Ground-wall resonance occurs at small values of horizontal peak ground acceleration (HPGA), namely 0.1-0.5g, with an amplification factor of A(m) = 1.2-2.2 at the crest of the wall. This factor decreases with increasing HPGA. For walls that attain states of maximum horizontal displacement (D-max)/H 5%, the failure mechanism consists of a vertical failure surface at a distance from the facing of 0.3H for the upper half of the wall and a Rankine triangular wedge over the lower half of the wall. Mononobe-Okabe theory gives dynamic earth pressure coefficients that agree well with experimental results based on k(h) = eta.HPGA/g, where k(h) and eta are the horizontal seismic coefficient and an empirical constant, respectively, with values of eta ranging from 1/4 to 1/3. Furthermore, the maximum tensile forces induced by shaking increase as the depth of reinforcement increases, generating a trapezoidal shape rather than the inverted trapezoidal shape proposed in the literature.