Shotwick Solar Park, Deeside
British Solar Renewables
This site lies on reclaimed land formed from sediment dredged from the River Dee Estuary. A two-post system was required, with relatively high edge table pull-out forces on the north-side piles.
Initial testing showed only marginal resistance for these locations, but rather than increase the pile depth or adopt some other form of anchorage, it was decided to check what strength increase with time might be developed.
Three separate test visits gave the following resistance / time relationship for northern edge piles:
A full 100% increase in strength was seen to be gained in these soils, after being installed for 100 days, which was more than sufficient to permit the original design to be safely adopted, with significant savings.