Numerical simulation of the stress strain state of base of the pile foundations’ fragment by the loading of the raft, not connected with the pile, in the conditions of field test

V. L. Sedin, K. M. Bikus, V. V. Kovba, Yu. Yu. Volnianskyi

Abstract


Purpose. Perform numerical simulation of the stressed strain state of the base of the pile foundation fragment by the loading of the raft, not connected with the pile and compare it with the results obtained under field conditions. Methodology. Creation of a model of the ground foundation of a pile foundation provided that there is no pile connection and a rafts’ fragment in the SC Plaxis and the staged loading of the fragment of the raft; use hardening soil model. To reproduce real conditions, in addition to the pile and plate studied, part of the pile investigation was modeled. Results. The picture of the effect of a single load of the raft on the behavior of the pile unconnected with it was obtained, the formation of additional tangential stresses around the pile and its displacement was recorded. Results of numerical modeling in comparison with the data of the field experiment. Originality. Numerical simulation was reproduced the conditions of full-scale experiment and fixed deformations of the soil under the plate, which provoked the movement not only of the pile being investigated (not connected with the fragment of the grillage), but also of surrounding piles located at a distance of 3 m. Practical value. Numerical modeling of the stress-strain state of the raft and pile fragment demonstrates satisfactory convergence with the results of the full-scale experiment, which indicates adequately selected parameters of the elastoplastic model with hardening of the soil in SC Plaxis PC. The high accuracy of the comparison allows us to anticipate the drafts of the pile and raft, provided there is no connection between them, as part of the foundation, and use a ground model with matched parameters for further modeling of the foundation and above-ground structure.

Keywords


numerical simulation; staged loading of the rafts’ fragment of the pile foundation; additional tangential stresses; hardening soil model

References


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