Discussion of 'New Earth Retention System with Prestressed Wales in an Urban Excavation' by Jong-Sik Park, Yong-Sun Joo, and Nak-Kyung Kim

摘要

The authors should be congratulated for the innovative retention system presented in the paper. The search for structural solutions permitting support to deep and wide excavations without using ground anchors has been a challenge for engineers, requiring a proper combination of geotechnical and structural expertise. This discussion aims to describe a solution with strong similarities to the one presented in the paper, which has been applied to support an excavation in Lisbon, Portugal, in 1982. Fig. 1 shows a plan and a cross section of the excavation, which was square in plan (39 x 39 m) and 24-29 m deep, for the construction of seven basements of a new building. The ground comprised a fill layer and Miocene sedimentary marine soils covering basalt rocks.