With highway improvements forcing embankment widening at an overbridge abutment there was a further need for retaining walls on the abutment slopes and under the existing bridge.

The proposed widening produced several challenges that the team had to overcome, including the lateral earth pressures imposed on the buttressing MSE wall.

Ultimately a composite trapezoidal MSE-embankment system was designed, exploiting the self-supporting characteristics of the existing embankment. This solution offered far greater advantages in terms of constructability and cost that a conventional box cut MSE wall design would have.

Read the full paper written by Ching Dai and James Livingston and presented by Ching Dai at the China Europe conference on geotechnical engineering, Vienna, 13. – 16. August 2018.