DBPapers
DOI: 10.5593/SGEM2014/B12/S2.095

RECOMMENDATIONS FOR GROUND VIBRATIONS SURVEY IN COURSE OF GEOTECHNICAL WORKS

W. Brzakala, A. Herbut, J. Rybak
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-08-7 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 2, 747-754 pp

ABSTRACT
Measurement techniques are developing to enable the monitoring of the vibrations transferred to the surroundings in course of geotechnical works, thus making it possible to carry out those works in a safer manner. A separate problem is posed when dealing with historic buildings, which may potentially come within the impact of vibrations. Intensive construction works carried out in the neighborhood of not infrequently old and valuable structures may threaten the historic housing, hence their safety aspect should be thoroughly considered. That concern for the existing buildings of historical value stimulated the development also of the new research area, namely the impact of deep foundations on the structure of the existing buildings. Inappropriate selection of technology for particular development conditions may lead to such problems as cracking of the adjacent structures or their settlement for unknown reasons. That negative impact can be reduced or even avoided when the vibration is investigated before (in order to get the picture of the so called „environment background”) and at the time when the construction works are initiated. Then, in carrying out construction works, the range of permissible vibration velocities and frequencies should be taken into account. As the old proverb says, necessity is the mother of invention; and so, on the market appeared a lot of firms offering a wide array of geotechnical technologies. The research conducted at the Faculty of Civil Engineering at Wroclaw University of Technology aim at defining the influence of ongoing works on the surroundings, as well as at preparing the guidelines on the selection and/or calibration of the technology. The experience gained so far is sufficient to offer services for companies. Those services are supposed to both: help with the calibration of the technology, as well as to protect the contractors from unjustified claims from the neighbors of the construction site. At the same time, the stored database of the surveys may, after being systematized, play a significant role in the non-destructive diagnostic testing of buildings.

Keywords: rapid impact compaction, pile driving, vibration monitoring