The intricate interfacing design detail was solved by smooth transition of loads from sloped wall to vertical wall at approaches.
The construction method adopted was to initially erect the multi-span TechSpan® and TerraTrel® with green finish near TechSpan®. Filling was carried out simultaneously at the end of TechSpan as well as in between TechSpan to restrict arch movement due to uneven filling. The movement of arches during backfilling was captured through FEM stage analysis before finalising the construction method engineering.
The major challenge of filling between arches was addressed by doing manual backfilling at the bottom, where space was a constraint between two arches. A temporary ramp was prepared at one end of the arch. A compact track loader was moved in between TechSpan® units for filling at top layers. The fill between consecutive arches was compacted using baby roller and plate compactors.