Faculty of Civil and Geodetic Engineering, Ljubljana (FGGLJ)
13.
Design of Ro-Ro berth breasting dolphin pile foundation in the port of Koper = Concepction de duc D`Albe pieu fondation de la jeteé roulante dans le port de Koper
In the Port of Koper new Ro-Ro berth for ships of length of about 240 m is planned. Therefore, it is necessary to construct a new berth with several breasting and mooring dolphins. The conventional ...concept is to transfer the horizontal ship forces to the ground via embedded steel pile or group of piles, where piles are embedded into the ground and loads transmitted directly from the pile(s) into the ground. As it was found out that thick deposit of very soft soils below the seabed is unable to provide the necessary lateral support to the steel pile. Thus, alternative design had to be adopted. To reduce the lateral pressures on the pile-soil interface and to increase the load capacity and lateral stiffness, an additional reinforced concrete (RC) block was initially proposed at the level of the seabed floor in order to transfer more load into the soil. However, due to the thickness of very soft soil below the seabed, this measure proved to be insufficient. Therefore, the idea was to support the concrete block with 4 additional steel piles in order to maximize the load transfer from the main pile to the supporting structure at the seabed level and to increase lateral stiffness. Several nonlinear numerical 3D analyses were made considering different designs and constitutive soil models. For the steel pile and RC block elastic behavior was adopted. The 26.8m long pile supported by RC block and additional piles %508mm were adopted as final design.
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