2026 Volume 21 Issue 1 Pages 45-59
According to previous model tests, the initiation of slope sliding, which was supposed to depend solely on yield acceleration A0 in design practice, has been found to be uniquely governed by a constant yield displacement u0. A Spring-Supported Newmark Method (SSNM) to replicate this pre-sliding yield displacement by inserting a spring floor underneath the slip plane is used to conduct slope sliding analyses of infinitely long straight slopes. The effect of the u0-value on slope sliding behavior are systematically studied by employing 10 earthquake motions of widely varied frequency contents. It is revealed that the employment of the yield displacement u0 tends to increase the slidetriggering acceleration Asl overshooting the yield acceleration A0 of the conventional Newmark Method as indicated previously in shaking table model tests, and also correspondingly decrease the sliding displacement δ significantly, thus giving a great impact on the evaluation of seismic slope failure hazards. The SSNM is then applied together with necessary formulations to a circular slip-plane of an example slope to demonstrate the applicability of SSNM to realistic design problems, and further implemented to evaluate the effect of slope reinforcements paying attention to their specific yield displacements.
