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A direct shear box, a ring shear apparatus, and a minipressuremeter are used: (1) to study the behavior of the cohesionless soil-structure interface; (2) to evaluate the friction mobilized at this interface. Tests have been carried out with a continual displacement of the structure in contact with the soil. The applied normal stress was kept constant during all tests. The influence of the mineralogy, the initial density, and the roughness are analyzed. The tests show that it is difficult to obtain identical laboratory results with different apparatus. It is necessary to validate these apparatus with the help of a comparison of in situ results. Once this validation is done, especially for the mini-pressuremeter, it is reasonable to consider the mini-pressuremeter for calibrating the structure in cohesionless soils.
Temporary assistant for teaching and research, Laboratoire de Géomécanique, Ecole Nationale Supérieure de Géologie, Vandœuvre,
professor, Laboratoire de Géomécanique, Ecole Nationale Supérieure de Géologie, Vandœuvre,
Stock #: GTJ10275J