Performance and predictions of an instrumented geogrid reinforced embankment.

摘要

The concept of soil-reinforcement in slope stability is based on the interaction between soil and reinforcement and is influenced by the number of reinforcing layers and their length. However, the precise nature of this interaction is not fully understood. The existing research has proposed several limit equilibrium design concepts based on similar yet distinct failure criteria.; This research investigates the validity of two of the commonly used design concepts which are based on an equal force or an equal spacing approach. The predictions from these design approaches were compared to the performance of a geogrid reinforced slope on the campus of the University of New Brunswick, Fredericton. The geogrid reinforced slope was instrumented with 32 strain gauges, an inclinometer and an open stand pipe. Observations were made during and after the construction of the slope.; Laboratory tests for the calibration of strain gauges and soil strength parameter were performed. The comparisons between the theory and observations revealed that the strains predicted by either of the design methods were considerably higher than measured in the field. However, there was sufficient evidence to indicate that the theory of equal forces is a valid concept. As the measured strains were small, it is concluded that the existing design methods lead to over-reinforced embankments.