HISTORY 1997
2000
easily withstand the highest tides mother nature can throw at it.
Such calm, shallow waters are in stark contrast to the traditional high tides of the Korean west coast where water levels, including at neighbouring Incheon City, often rise 30 feet plus. The airport’s ideal natural setting also benefitted phase two of its construction as the low tide meant that it was only necessary to fill a soil depth of five metres, a key factor in keeping the airport’s construction costs down.
The complicated process of creating a surface suitable for construction involved dredging and
draining the tidal site and adding landfill, principally taken from the rocky terrain on and around the airport site.
A mixture of sand and paper drains were initially driven into the ground at an average depth of 13 metres to absorb any remaining water below the surface. Five to six metres of soft soil was then added to stabilise the ground and force 50cm of deep subsidence that effectively squeezed out the last of the tidal water.
The dredged site was then triple hammered with a 10-ton weight to force it down another 40-50cm and additional earth added as part of the ‘soft soil’ technique
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