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INFLUENCE OF GEOTECHNICAL WORKS ON NEIGHBORING STRUCTURES

MSc Filipa Oliveira, Prof. Dr. Isabel Fernandes

Abstract

Geotechnical works are closely related to civil engineering works, both in the initial phase of a construction and, in special cases, after the construction when new structures are built in the vicinity. Depending on the foundation ground capacity, many types of works must be developed such as various pile driving methods, slope containment, deep excavation, ground improvement or treatment, etc. Associated with special types of works there are the vibrations propagated in the ground from depth to the surface which, depending on the propagation velocity and wave frequency, can damage nearby older structures. To prevent these situations, it is common to perform preliminary numerical studies and continuous ground vibration monitoring in the existing neighboring structures. This technique allows for classifying ground vibrations in different categories according to the purpose of neighboring structures (historical, residential and industrial) and the vibrationsпїЅ parameters propagation velocity and wave frequency. Aiming to guarantee the safety of the construction site and neighboring area, via the equipment used in ground vibrations monitoring, it becomes possible to define energy boundaries of the equipment used in different geotechnical works. First attempts to reduce this impact by an active generator were also already presented in the literature. This article was based on case studies of works developed in Poland: in Wroc?aw and Lubin (Poland), regarding ground vibration monitoring on rapid impulse compaction (RIC) technique. Similar experience was gained on sheet piles driving in Szczecin and Wroc?aw. The main advantages and limitations of the implementation of methods are shortly discussed for each case on the basis of authorsпїЅ experience. The results are analysed with the aim to understand the technology applicability.

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DOI resolver: doi.org/10.5593/sgem2017/12/s02.126

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