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Synopsis A new and a quicker method for conducting a load test on piles is described. It eliminates the need of a load maintainer or constant pumping of the jacks to maintain the load at a particular value. The method involves the application of load and its partial automatic release due to the consequent settlement of the ground. A state of equilibrium is achieved between the load and subsequent settlement and the ultimate load is obtained with fair accuracy from the load settlement curve. On décrit une méthode nouvelle et plus rapide pour faire un essai de chargement de pieux. Elle élimine le besoin d'un dispositif de maintien de la charge ou un pompage constant des vérins pour maintenir la charge à une valeur constante. Cette méthode fait jouer l'application de la charge et sa libération partielle automatique due au tassement du sol en résultant. Un état d'équilibre est obtenu entre la charge et le tassement postérieur et la charge finale est obtenue avec une bonne précision à partir de la courbe de tassement de la charge.
SYNOPSISThe Paper presents an approach to the prediction of the bearing capacity of piles in advance of piling operations by the use of static cone penetration tests.The study was carried out on cast-in-situ driven concrete piles. The distribution of skin friction and point resistance at various loads was determined during the tests by measuring strains with wire resistance strain gauges.The values of total skin friction and point bearing were also determined independently at different loads by adopting a cyclic load test technique.Pull-out tests were made to determine the frictional resistance under pulling, and the values obtained were found to be less than those obtained under pushing during the load test. The coefficients of earth pressure were also determined from the friction values obtained during the load tests and were found to decrease from a value equivalent to the passive earth pressure state at the top to a lower value at the bottom.A compilation of data already available on the frictional resistance of piles was also made. It revealed that in soils of average stiffness (cone penetration values of IO-100 kg/sq. cm) the value of unit skin friction of a pile was roughly 2% of the average cone penetration resistance along the pile length.
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