TPPT2
Tubular Pile Pull-out Testing - Phase 3
Publieke samenvatting / Public summary
Aanleiding
The Tubular Pile Pull-out Testing Programme has used the opportunity to execute additional tensile tests on four existing tubular piles (O.D Ø1.22 m with lengths of 33 and 38 m) that had previously been tested under static compression load in a project that was funded by Port of Rotterdam and her partners (Phase 1). The additional test program executed in Q1/2023 (Phase 2) included static and dynamic tensile load test program, which represent the loading regime to which anchor piles are subjected to when connected to floating wind turbines through mooring lines. These piles were equipped with special instrumentation which provides strain measurements along the pile, the forces applied and pile displacements. In addition, Cone Penetration Tests (CPT) were carried out to allow to unravel correlations between soil strength and the pile measurements.
Doelstelling
In Phase 3 of the programme, the test results will be interpreted to provide better understanding of the soil-pile interface.
Korte omschrijving
The test results will be compared with current prediction methods done prior to the tests. Furthermore, additional laboratory testing will be conducted, notably pile-soil interface tests which will be used to improve the pile-soil interface behaviour. The better understanding of the soil-pile interface will serve as input to an update of the existing design guidelines or recommended practices for piles under tensile loading.
Resultaat
The updated guidelines are expected to significantly reduce the foundation cost required to moor offshore renewable floating structures.
The Tubular Pile Pull-out Testing Programme has used the opportunity to execute additional tensile tests on four existing tubular piles (O.D Ø1.22 m with lengths of 33 and 38 m) that had previously been tested under static compression load in a project that was funded by Port of Rotterdam and her partners (Phase 1). The additional test program executed in Q1/2023 (Phase 2) included static and dynamic tensile load test program, which represent the loading regime to which anchor piles are subjected to when connected to floating wind turbines through mooring lines. These piles were equipped with special instrumentation which provides strain measurements along the pile, the forces applied and pile displacements. In addition, Cone Penetration Tests (CPT) were carried out to allow to unravel correlations between soil strength and the pile measurements.
Doelstelling
In Phase 3 of the programme, the test results will be interpreted to provide better understanding of the soil-pile interface.
Korte omschrijving
The test results will be compared with current prediction methods done prior to the tests. Furthermore, additional laboratory testing will be conducted, notably pile-soil interface tests which will be used to improve the pile-soil interface behaviour. The better understanding of the soil-pile interface will serve as input to an update of the existing design guidelines or recommended practices for piles under tensile loading.
Resultaat
The updated guidelines are expected to significantly reduce the foundation cost required to moor offshore renewable floating structures.