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For 1g model tests in sand a pressure-dependent correction for the displacements of rigid foundations in service states is proposed on the basis of a similarity analysis. The theoretical treatment includes a square foundation with a vertical load and a vertical pile with a horizontal load. The theory is checked and confirmed by triaxial tests and model tests using shallow foundations. Scaling rules are derived that confirm equations proposed by Terzaghi and Bjerrum. As a practical application a load-settlement formula for a single shallow foundation is proposed which includes the influence of the foundation size, its shape and bedding depth and the soil density. The Authors show how the soil parameters may be determined from plate loading tests.

On propose pour des essais à échelle réduite sans centrifugeuse avec du sable une correction, basée sur une analyse de la similitude, pour le calcul du déplacement des fondations rigides. Le calcul théorique comprend une semelle carrée chargée verticalement et un pieu vertical sousmis à un effort horizontal. La méthode est testée et confirmée par des essais triaxiaux et des essais à échelle réduite utilisant des fondations superficielles. On en déduit des règles d'étalonnage qui confirment les équations proposées par Terzaghi et Bjerrum. Comme application pratique on propose une formule reliant charge et tassement pour une fondation isolée superficielle. Cette formule tient compte de l'influence de la taille de la fondation, de sa forme et de son encastrement ainsi que de la densité du sol. Les auteurs montrent comment les paramètres du sol peuvent être déterminés à partir d'essais de plaques.

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