The test and design of multi-direction-jammed piles

In this paper, the test and design for a new type of pile, which is named Multi-Direction-Jammed(MDJ) pile, is reported. The MDJ pile is such a filling pile that there is a protrusive disk at its bottom and many tooth blocks which are distributed regularly along its periphery. The holes around the pile’s periphery and under end are formed with jamming the soil by using a special equipment, and it is expected to reach the optimum state in Soil Mechanics. In a series of model tests made by the authors, the MDJ pile was compared with conventional piles, the results conclusively showed the bearing capacity of MDJ pile grows by a factor of three even more, the settlement greatly decreases, the concrete consumption saves 70% or more and the cost is obviously conserved as well. Le présent texte expose les épreuves et études des pieux de nouveau type en Multi-Drection-Jammed (MDJ), ces pieux se constituent en beaucoup de blocs en dents et de plateaux coulés Sur place. Les trous des pieux se forment à l’aide de dispositifs spećiaux refoulant le sol, done cela peut faire parvenir les efforts du sol à l’optimum. On constate en évidence, par les essais analogiques sériels de l’auteur, que la charge de pieux MDJ est plus élévee de plus de 3 fois que celle de pieux généraux, en épargnant le béton de plus de 70%, diminuant beaucoup de tassements, abaissant aussi l’ensemble de frais.