A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Seismic investigation methods for the testing of jet-grouting piles
The survey of jet-grouting piles often needs to answer two questions: do the piles form a waterproof barrier and/or what is their diameter as a function of depth? At present there is no adequate technique to control jet-grouting piles especially when the information required is the diameter as a function of depth. The classical 'sonic test' only gives characteristics between two boreholes in the same pile and, to our knowledge, the impedance method has never been reported to perform well as far as the diameter is concerned. In this paper we describe first a seismic method to characterise the continuity of jet-grouting piles barriers. It is based on a transparency technique, where a source and a receiver are located in two neighbouring jet-grouting piles. Experimental results on real field conditions are presented. We then present another seismic method in development to determine the diameter of the piles as a function of depth. It is based on the reflection of seismic waves on the jet-grouting pile surface. The source and the receiver are piezo-electric hydrophones, both located in a central bore-hole. As with the impact echo method, the seismic signals are viewed in the frequency domain. At present, after various finite element parametric studies, the method has been tested on concrete test pipes of various diameters.
Seismic investigation methods for the testing of jet-grouting piles
The survey of jet-grouting piles often needs to answer two questions: do the piles form a waterproof barrier and/or what is their diameter as a function of depth? At present there is no adequate technique to control jet-grouting piles especially when the information required is the diameter as a function of depth. The classical 'sonic test' only gives characteristics between two boreholes in the same pile and, to our knowledge, the impedance method has never been reported to perform well as far as the diameter is concerned. In this paper we describe first a seismic method to characterise the continuity of jet-grouting piles barriers. It is based on a transparency technique, where a source and a receiver are located in two neighbouring jet-grouting piles. Experimental results on real field conditions are presented. We then present another seismic method in development to determine the diameter of the piles as a function of depth. It is based on the reflection of seismic waves on the jet-grouting pile surface. The source and the receiver are piezo-electric hydrophones, both located in a central bore-hole. As with the impact echo method, the seismic signals are viewed in the frequency domain. At present, after various finite element parametric studies, the method has been tested on concrete test pipes of various diameters.
Seismic investigation methods for the testing of jet-grouting piles
Seismische Untersuchungsverfahren zur Prüfung von strahlvergossenen Pfeilern
Abraham, O. (author) / Prieur, A. (author) / Cote, P. (author)
2001
7 Seiten, 8 Bilder, 4 Quellen
(Nicht paginiert).
Conference paper
English
Jet Grouting Slabs and Jet Grouting Piles
| Springer Verlag | 2021
Numerical Analysis of Piles Group Surrounded by Grouting Under Seismic Load
| Springer Verlag | 2022
Mitigation of Seismic Hazards Vulnerability by Jet Grouting to Encase Existing Piles
| British Library Conference Proceedings | 2014