Publication Abstract

Proceedings - Second International Conference - Piling and Deep Foundations, 1987, Luxembourg, (DFI)

Laboratory Validation of In-Situ Tests
R. Bellotti, V. Crippa, P. Morabito, & S. Pedroni; ENEL-CRIS, Milan, Italy G. Baldi, C. Fretti, D. Ostricati; ISMES, Bergamo, Italy V. Ghionna, M. Jamiolkowski, E. Pasqualini; Technical University of Torino

This paper summarizes seven years of Italian experience with the use of large calibration chambers for the calibration, under closely controlled stress and strain conditions, of some in-situ testing devices which are used in sand deposits. At the present time two calibration chambers are operating in Italy, one at ENEL-CRIS, and the other at ISMES. Both chambers can accommodate cylindrical samples 1.2 m in dia- meter and 1.5 m in height. A detailed description of these chambers can be found in Bellotti, et. al (1982). Preliminary design studies began in June 1975, with the cooperation of Prof. J.H. Schmermann (University of Florida, USA) and Dr. J.C. Holden (Country Roads Board of Victoria, Australia). In September 1977, after some Italian researchers visited a similar facility at the Norwegian Geotechnical Institute at Oslo, the first tests were performed in order to check the equipment and to train the personnel involved. The experimental research program started in January 1978. So far, research has been mainly devoted to the calibration of the electrical static cone penetrometer (CPT). Tests have also been performed with the Marchetti dilatometer (DMT), and recently some experiments have started with self boring pressuremeter (SBP). In this paper the results of electrical cone penetration tests performed in the calibration chambers (CC) on meduim- coarse sands will be presented and discussed. A list of published papers and discussions about the ongoing CC research is given in Appendix I.

 article #604; publication #40 (IC-1987)