Year: 2008

During the extension work of Tartu airport the runway was extended by 420 m. It was known beforehand that the subsoil is weak but during construction work it came out that the situation was even worse. The subsoil of the embankment was taken out and it was discovered that it is too weak and wet in order to build a strong embankment for a runway. There was a risk that springs remaining under the extension would flood the embankment layers, reducing thus the bearing capacity. Building a Tensar mattress from granular material reinforced with two layers of TriAx geogrids helped to achieve two goals: a drainage layer was formed which prevented access of water from the upper layers and at the same time a strong stiff platform over variable and soft subbase was established. When the base course was ready the bearing capacity of this area was measured and the results met the requirements.