Felixstowe Port Expansion | Piling Contractors | Vibro | Keller UK

Felixstowe Port Expansion

 

The project included land reclamation extending up to 250m into Felixstowe’s eastern channel where  water depths were up to 17m using about five million cubic metres of sand fill won mainly from the North Sea.

The fill was retained by the Main Quay Wall comprising 2.65m diameter clutched tubular steel piles at 2.7m centres sunk 21 metres into the sea bed.When sand fill is placed in deep water it tends to be relatively loose, with low angle of friction and significant settlement potential.

There are generally therefore three main problems:

To develop high angle of friction in the wedge of sand fill behind the quay wall

To control both short term and long-term settlements to specified limits within designated zones.

To provide transition settlement control zones adjacent to the Main Quay Wall treatment area, the original foreshore and within a former dock basin.

 

These problems were solved by the adoption of careful control of the grading of the sand fill to be placed within the designated zones plus the performance of vibro compaction using Keller Vibrators to improve the densities of the sands.

 Keller employed S320 vibrators which have 150 kw of power and run at 30 HZ frequency to compact the clean sand fill to relative densities of up to about 80%.

Keller Foundation performed the vibro compaction without the addition of stone using three  90Tonne cranes  for the S-vibrators and further 60T crane for the smaller M-type vibrator with capability of treatment depths of up to 21.5m.

 Lankelma undertook some five hundred pre- and post-treatment CPT tests on approximate grids of one test per 1000 and 500 square metres respectively in order to confirm the effectiveness of treatment.

 

 

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