Creating a 17.9 km bypass to improve traffic flow, the new Gdansk road is being built as part of a programme of infrastructure improvements which includes those for the forthcoming Euro 2012 football tournament. Tensar International’s TriAx design solution has been used in the sub-base to help combat differential settlement across the poor soil of the Wistula river delta and minimise frost heave caused by Poland’s severe winters.
“The ground has a high water level and the typical weak organic consistency of estuarine silt deposits,” comments Dr. Jacek Kawalec, Tensar’s Eastern European Business Manager. “While the main support is achieved through concrete piling, the consulting engineers were concerned to reduce the effects of any possible differential settlement.
“They asked us to provide a Tensar TriAx design solution to mechanically stabilise the sub-base of the road, so minimising any differential settlement. Additionally, the solution is quick and easy to install, and requires less aggregate than conventional road design. It also provides protection against any movement as a result of the sub-zero winter temperatures which last three months on average.”
The 17.9 km road comprises two 3.5m wide lanes in each direction, plus 2.5m of emergency lane at each shoulder; the minimum crown width is 27m. As well as the supporting piles, vertical drains and additional embankments were employed where required Tensar TriAx was employed across the whole width and length of the route. .

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