Excavation without internal support and its implications in construction management: A case study
Journal
Journal of GeoEngineering
Journal Volume
12
Journal Issue
2
Pages
81-88
Date Issued
2017
Author(s)
Abstract
This paper presents a case study of a basement construction during building renovation, where an underground tube-like retaining structure was constructed with a strut-free support system. This underground structure was formed by combining a new arch diaphragm wall built outside the old basement and an arch reinforced concrete wall constructed inside the old basement. The arch reinforced concrete wall was connected to the old substructure or basement. Pile installation, excavation, and demolition were conducted inside this tube-like retaining structure. The lateral displacement of the retaining wall and soil and the stress of the rebar in the diaphragm wall and the ground settlement surrounding the construction site were measured at each stage of the construction. Field measurements indicate that after the completion of the new substructure, the maximum displacement of the wall was 20 mm, which was about 0.1% of the final excavation depth. These values were much smaller than the values obtained in the common excavations in Taipei. The field measurement results demonstrate that the combination of a new arch diaphragm wall and an old retaining wall support system is feasible in a building renovation context. This method reduces not only the construction cost but also the construction duration by up to 6 months.
Type
journal article