Design Methodology for Stabilizing Slopes using Recycled Plastic Reinforcement

Surficial slope failures, or nuisance slides, constitute a significant economic and manpower burden for many transportation agencies due to the frequent and recurring nature of the slides. A new method for stabilizing surficial slides using reinforcement manufactured from recycled plastics is being developed to provide agencies with a cost-effective alternative for stabilizing these slopes. As a part of this development, a design procedure has been established that draws upon previous experience with more conventional reinforcing materials such as concrete and steel, but with modifications to account for the reduced strength and stiffness of plastics. The design method follows a limit state design approach wherein a number of different limit states are considered, including failure of the reinforcing members, to establish the resisting force provided by the reinforcement. In this paper, the general design method is presented followed by more detailed coverage of each of the specific limit states that are considered in the design. Several design issues that remain to be addressed are also discussed.