On the ground settlements observed during execution of jet grouting columns in urban area adjacent to a historic building

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Publication Title
On the ground settlements observed during execution of jet grouting columns in urban area adjacent to a historic building

Abstract
During the execution of jet grouting columns for the stability of deep excavation of the construction pit for new residential building, the adjacent historical building settled for 15 to 35 mm causing cracks in its masonry walls. The historical building is 132 m long and 18 m wide having shallow foundation 2 m below ground surface. The cracks of the building during the execution of JG columns were noticed up to 90 m away from the construction activities. In the paper, we present the tentative explanation of the reasons for the observed behaviour and the activities that brought us to the conclusions. The ground profile consists of three characteristic soil layers resting on a weak bedrock. The foundation layer for the historic building is a very dense clean alluvium gravel with a thickness of 10 m. Next 10 m consist of saturated very loose to loose silty gravel with sand. Following some hints from the literature, we believe that the drilling and jet-grouting procedures affected the loose structure of the layer between 10 and 20 m depth resulting in far reaching settlements of entire upper stiff gravel layer and structures resting on it.
Authors
Janko Logar; Bostjan Pulko; Jasna Smolar; K. Ostir

Published In

18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)

Theme

D - Current and new construction methods

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