Calculation of settlements of vertically loaded piles: methods for deriving deformation parameters
M. Allani, N. Huybrechts, Geotechnics No. 4, December 2020, page 10
To date, the focus in Belgium has mainly been on the design of piles in the ultimate limit state (UGT). However, EC7 mandates that a check of the serviceability limit state (BGT) be performed in addition to the UGT check. Within the framework of a prenormative study subsidised by the NBN-FOD Economie, methods were drawn up for deriving the settlement of an individual pile. These methods are presented in this article. Full article
Application of a new load-settlement model for open-tube piles
F. Mortelmans, H. Peiffer, Geotechnical Engineering No 4, December 2020, page 18
In this paper, a theoretical model is established to predict the load-sagging behaviour of large-diameter open-tube piles. This model is then used to predict the settlement behaviour of the open tubular piles of the second Scheldt Bridge in Temse. Full article
Construction of three flyovers in the Amstelveen Line: design and implementation of pumping
C. te Boekhorst, G. Winters, Geotechniek no 4, December 2020, page 24
For the conversion of the Amstelveen Line into a high-quality tram connection, tension dewatering with return dewatering was applied for the construction of the level crossings. It concerns the existing Kronenburg, Zonnestein and Sportlaan stops to improve traffic flow. This article elaborates on the design and implementation of these dewaterings. Full article
Starting an innovative design with EEM and quality control of one-step high-pressure injection micropiles
F. Schokking, J. van der Wiel, P. IJnsen, Geotechnical Engineering No 4, December 2020, page 30
The design of one-step high-pressure injection micropiles according to the current Eurocode 7 underestimates the available bearing capacity of the piles and incorrectly represents the occurring pile-soil interaction. A start is made on an innovative design methodology with finite element modelling, simulating both the installation process with high-pressure grout injection and the pile loading. A quality control concept based on monitoring of the injection process is developed to ensure the design assumptions regarding grout-body dimensions. Full article
Experience with design in accordance with CRW 689.17 at The Green Arch. Walkability of construction sites according to construction site certificate
R. van de Bilt, M. de Koning, Geotechniek No 4, December 2020, page 38
In 2016, the NVAF introduced the Construction Site Certificate to prevent unsafe situations on construction sites. Part of the certificate is that the construction site must be adequately maintained to ensure the load-bearing capacity of the construction site during the work. For foundation machines, this requires determining the maximum ground pressure according to directive CRW 689.17. This article describes how the application of the certificate and guideline CRW 689.17 was handled for the "A16 Rotterdam" project. Full article
Damage to geotextiles by falling stones
A. Bezuijen, E. Izadi, Geotechniek No 4, December 2020, page 50
Drop tests with 40kg concrete blocks on geotextiles on a subsoil of sand were used to investigate the conditions under which a woven (fabric), non-woven (nonwoven) geotextile or a composite of a fabric and a nonwoven is damaged. The results were compared with the 'Design Guideline Geotextiles under Stone Coverings'. They confirm some aspects mentioned
in that guideline: the maximum elongation at rupture is important, the absorption energy is less important. However, the results also show that reality is more complicated than shown in the guideline and how two geotextiles placed on top of each other respond to impact. Full article