Abstract
It is known that the use of compressible material (e. g tire chips) on the backfill can significantly reduce the load against retaining wall. This reduction of earth pressure is achieved through a mechanism of simulating the quasi-active or the intermediate active state. If there exists a highly compressible material between soils and retaining wall, the backfill soils approaches to active state. In this paper, this mechanism has been numerically evaluated. In the numerical simulation, the modified Cam clay model with super-subloading yield auface and rotational hardening concept (SYS Cam Clay model) was used. The SYS Cam Claymodel (Asaoka et al 2002) is the elasto-plastic model that takes into the account the soil structure as well as overconsolidation and anisotropy, which was introduced by Hashiguchi. Using this model, the typical responses of dense and loose sand can be described.
