This work studies the correlation between certain physical properties of granular material such as the friction angle and the grain size distribution. In the laboratory, the determination of friction angle requires hard and expensive testing. Prediction of this parameter from the grading curve proves to be very interesting. Direct shear tests were performed on actual marine sand of Tergha (Algeria) and on seventeen different samples arranged from the same sand with various particle size ranges. Results showed that the friction angle of sand is a result of contribution of various constituent granular classes.
RésuméLes résultats d'essais consolidés non drainés sur des échantillons reconstitués de sable d'Hostun sont analysés pour mettre en évidence les conditions qui con duisent au radoucissement du sable sous charge monotone.
AbstractResults of CIU tests on reconstituted samples of Hostun sand are presented to establish the conditions to induce strain-softening during monotonic loading. The test program confirmed the existence of an upper and lower limit of the F line defined by CASTRO to characterize the conditions of steady state defor mation in loose sands. These limits were refferred to as the UF line and LF line, respectively. The minimum undrained shear strength of Hostun sand cor responds to the LF line and is dependent upon both the void ratio and the con solidation pressure ; i.e. upon the initial state parameter. Similar results were obtained on different sands by KONRAD (1990).
In this paper, an experimental study which required the design and implementation of a model containing plastic granules powder to simulate a natural environment, is presented. The latter is subjected to the removal of "anchor plates." For each test, several digital photographs are taken to materialize different deformed configurations during the pullout process. These photos processed in couples by the 7D software (image correlation) giving the evolution of the displacement field and plane strain analogical environment. Particular attention is paid to the discussion of the interference of rupture zones of neighboring anchors by reducing the axis between plates.
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