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The procedure proposed is basedonthecalculationofthe specificdrinffig energy (SDE) bydrilling parameters and its correlation with strength parameters obtained in the traditional way (for example core drillings and penetrometertests). The procedure may be betterunderstood by considering two case histories. The first regards the foundations of viaducts of the new Bari - Taranto railway (Puglia region, Italy) resting on a pliocenic Calcarenite lying on a Cretaceous limestone, both being jointed and affected by deep karst phenomena; the second concerns the control of vibroflotation treatment oflagoon soils for the embankment ofthe new railway Ancona - Bari (Italy). INTRODUCTION The use ofdrilling parameters for the geotechnical characterization ofthe ground has become possible due to two technological procedures: a) the diffusion of pneumatic and hydraulic drill rigs allowing easy reading and recording of parameters; b) the progress and the diffusion of electronics and informatics, allowing the construction of small recording devices. The resistance to boring is largely utilized in geotechnics when penetrometers are employed, but the non coring drilling technique presents the following advantages: a) it is possible to employ the same machines of constructionworks; b) the rigs needno anchoring orspecial ballasts as the staticpenetrometers; c) theycandrill in all directions as unlike the penetrometers; d) it is possible to drill the hardest rocks and not stop ifa stone is encountered as inthe case ofpenetrometers; e) they can be used to the control ground treatments, generally not easy nor possible with the penetrometers because ofthe ground's density.