The project will involve over 5,200 stone columns being installed, using two of the Group’s low emission vibro stone column rigs.
Van Elle had to deliver a series of trial installations and testing regimes, in order to ensure the client’s specification and design could be met.
The first trial area, located at Gatemead, had a grid of stone columns installed, followed by extensive zone load testing and settlement monitoring by our ground investigation specialists—Strata Geotechnics—using extensometers and piezometers, as the load increments were added.
Test data helped provide an extensive report on the predicted settlement performance of the proposed HS2 rail embankment, which the vibro stone columns will support.
Following the completion of the first trial, a second trial was carried out across the Breakspear Road Bridge over on the main West Ruislip section. After reports were compiled and settlements assessed, the ground improvement team commenced on the main works at WRRE which will last over a 14 week period.