Application of Mechanically Stabilized Earth Wall with Geo-synthetic Strap Soil Reinforcement for False Abutment Structures

This case study highlights a Light Rail Transit (LRT) structure in Ottawa, ON which has utilized Mechanically Stabilized Earth (MSE) walls in conjunction with a false abutment. While MSE walls are very commonly associated with this type of structure, some unique features have differentiated this project from others of similar scope.

Specifications for this project limited the soil reinforcement strictly to geo-synthetics. In addition, the selected MSE wall system, implements the use of strap elements as soil reinforcement in conjunction with inclusions in the Reinforced Zone, which sets this project apart due to its unique nature. Some of the challenges that were encountered during both the design and construction phases of this structure will be discussed in further details within this paper. One example of the challenges faced during design and construction is the fact that piles for the false abutments are embedded into the Reinforced Earth zone and the soil reinforcement was required to avoid those obstacles while simultaneously resisting the horizontal forces coming from the superstructure.

The conclusions drawn from this particular experience are that with the proper design and understanding of the variables affecting this type of structure, MSE walls are a reliable and efficient solution.