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2 Studia Geotechnica et Mechanica

2 2010

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Effects of the friction reducer on the standard PENCEL pressuremeter cone tip in soft clays

100%

Messaoud F. , Houam A.

tom Vol. 32, nr 3

55-69

This study was performed to evaluate a standard method of PENCEL pressuremeter (PPMT) testing to allow engineers to more precisely carry out the standardized tests and to generate the p-y curves for analysis and design of deep foundations. Based on the results of a comprehensive testing program the evaluation indicates that the testing procedure is acceptable. A recommended interpretation and procedure are presented. The effects of adding a 1/16-inch friction reducer to the standard PENCEL cone tip used for clay soils were negligible. Dilatometer tests (DMT) were conducted for comparison with PPMT data. From PPMT data, which were reduced to graphs of pressure versus volume and pressure versus relative change in probe radius, soil parameters including the initial pressure, the initial moduli, the reload moduli, and the limit pressure of the clay were determined. The PPMT soil parameters from both types of cone tip show a good agreement with published values. Correlations were found between the PPMT and DMT results, which show consistency in the values of soil parameters. A comparison between PPMT and DMT p-y curves was made. The initial slope of the curve shows a good agreement for this comparison. The predicted DMT and PPMT ultimate loads are not similar, while the predicted PPMT and DMT deflections within the elastic range are identical. The PPMT is a suitable in-situ tool to duplicate the pile installation and to predict the resistance of laterally loaded soil for the purpose of analysis.

Prediction of collapsible soils by cone penetrometer and ultrasonic tests

80%

Abbeche K. , Laouar M. S. , Messaoud F.

tom Vol. 32, nr 2

3-21

Collapsible soils type are in nature unsaturated soils, which are characterized by a metastable structure and undergo an abrupt collapse when they are flooded (with or without loading), which causes important damage. Based on the structural composition of these soils, we reconstituted the samples made up of sand and fine particles occurring in various proportions. The first phase of the work consists in the experimental determination of the geotechnical characteristics of these samples. It is thereafter proposed a test program based primarily on the use of the cone penetrometer and the ultrasonic apparatus allowing the factors which influence collapse to be predicted. The results obtained clearly show the influence of certain parameters such as water content and the energy of compaction on the collapse potential and the ultrasonic speed.