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Behaviour of laterally loaded piles in natural sandy gravels

Field testing of laterally loaded single piles and group of piles in natural sandy gravels is presented. Testing is performed on monotonically loaded single pile, cyclicly loaded single pile, group of 2 by 1 piles monotonically loaded and group of 2 by 3 piles monotonically loaded. During the field testing, pile deflections were measured using inclinometer probe, which was placed in inclinometer casings installed in pile axis. Tests are performed for establishment of pile behaviour in natural sandy gravels and to try to depict the influence of dilatancy, in this type of soil material. Soil is tested in large direct shear box in order to obtain strength parameters needed for calculation of p-y curves proposed by Reese and Van Impe and for numerical analysis, by using simple Mohr-Coulomb and Drucker-Prager constitutive models. Piles are loaded with hydraulic press, counter- bracing the massive concrete block, which will transfer the load on a steel frame and pile heads thus pulling the piles away from concrete block. Performed tests can be described as displacement control tests. Piles are displaced in increments of 2mm while the force on hydraulic press will be read out for each increment. Measured results are compared with results of numerical analyses performed using Rocscience RS3 software package. Pile and soil material are described using Mohr-Coulomb constitutive material using associated and non- associated flow behaviours for soil material. Based on field tests and numerical analyses, the conclusions and further research in the field of laterally loaded piles in coarse- grain material are presented.

laterally loaded piles; natural gravels; p-y curves

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