Abstract
Accuracy of numerical modelling of ground resistance of the displacement pile highly depends on proper evaluation of its states: prior loading and its changes during the loading. Evaluation of initial ground stage, its subsequent changes caused by pile installation and, finally, evolution of the loaded pile resistance are the modelling stages that require validation with specialized test results performed under controlled laboratory conditions. Selection of the proper physical soil model and its parameters should be also done in accordance with the relevant soil tests results. The first paper briefly introduces testing results of a displacement pile prototype. Tests were conducted in the created sand deposit in the laboratory pit. Determining pile resistance and ground stress-strain distribution in the vicinity of the pile allows selecting the physical model for the soil. Numerical calibration of the parameters for the physical model of the selected soil was performed. The second, following paper will introduce analyses of pile resistance. It involves creation of a discrete model and its parameters, numerical modelling of pile resistance against vertical load. The pile ground resistance modelling applying the physical model of the selected soil includes the following stages: evaluation at rest stage and assessment of residual effects of installation and displacement pile loading resistance. Numerical analyses results were validated with displacement pile prototype testing results.
Highlights
Analysis and design approaches for predicting the bearing resistance and deformation of a pile and pile group foundations are the issues raising continuous interest in engineering practice
A steel displacement pile prototype was constructed for analyzing the ground base and shaft resistance evolution of a low slenderness short displacement pile (SDP)
Creation of the sand deposit with stable properties per volume in the laboratory pit, subsequent cone penetration tests and laboratory tests with deposit samples for determining the initial physical and mechanical properties of the deposit were performed at the first stage of the test program
Summary
Analysis and design approaches for predicting the bearing resistance and deformation of a pile and pile group foundations are the issues raising continuous interest in engineering practice. A large number of experimental, analytical and numerical investigations on prediction of pile and pile group foundation resistance have been performed up to know. The research considered the pile-soil-pile shear interaction effect for response measures of foundation; the results of numerical analyses using Plaxis 3D were compared with other known prediction methods and field measurements. Evaluation of residual effects, i.e., determining the actual soil properties in the vicinity of the pile when installation load of displacement pile (DP) is removed, depends on proper evaluation of the initial (at rest) ground soil properties and the stress state. Prediction of loading resistance of the installed DP depends on the proper evaluation of the residual stress-strain state (SSS), relating it with the initial SSS of the ground.
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