Tunnel logistics on and next to a pole mattress in the polder
W.P. Munsterman, N. Kalle, B. Lietaert, Geotechnical Special Rijnlandroute, August 2020, page 36
For the realisation of bored tunnels, tunnel logistics is of great importance. Challenging was the construction of a tunnel-logistics site in a polder with very weak soil structure. The site consists of many structures with requirements set accordingly. Integral cooperation within the disciplines of tunnel, civil engineering, realisation and GWW, proved important and resulted in a well-functioning tunnel logistics site. Full article
Experiences 1st bore tunnel Rijnlandroute
B. van de Water, M.H.A. Brugman, B. Safari, T. Schubert, Geotechniek Special Rijnlandroute, August 2020, page 42
One of the challenges of the route to be drilled for the Rijnlandroute tunnel was the passage of the Rijn-Schie Canal. Due to the low ground coverage above the tunnel boring machine under the canal, the limits of the control pressures for keeping the boring front stable had to be responsibly explored. The first boring of the RijnlandRoute brought interesting experiences regarding vibration nuisance and a geological exception with the encounter of very coarse gravel and boulders. Full article
Drainage ensures dry excavation pits at N434 sunken section
B. Peerdeman, L. Lamers, Geotechniek Special Rijnlandroute, August 2020, page 45
For the realisation of the 2km-long sunken location and the accesses to the N434 motorway, dewatering is largely used to obtain dry cofferdams. The dewatering consists of phreatic dewatering and tension dewatering to ensure that no bursting occurs. With the help of a trial dewatering, a balanced design has been made, using relatively shallow filters in the pleistocene package and a sheet piling for maximum barrier effect, to achieve a minimal circulation effect, despite the short distance to the return wells. The pumping is designed so that no negative impact on the surrounding area is noticeable. Full article
Shoring piles and reinforced underwater concrete around deep water pipeline & a complex foil construction
B. Peerdeman, M. van den Hoogen, T. de Goede, J. van Es, Geotechniek Special Rijnlandroute, August 2020, page 48
The sunken N434 includes an aqueduct and an ecopassage under the A44 motorway. A water cellar has been constructed at the location of the aqueduct. An underground high-pressure water pipe runs under the water cellar and was installed by means of directional drilling. Using shoring piles and a partially reinforced underwater concrete floor, it was possible to create a dry construction pit. Another special design concerns two foil structures for the ecopassage. The foil structures were dry-laid using (tension) drainage. Full article