Geotechniek 2015 - Special ECSMGE
A coarse sand barrier as an effective piping measure
V.M. van Beek, A.R. Koelewijn, G. Negrinelli, U. Förster, Geotechniek Special ECSMGE, September 2015, pagina 4
Recent safety studies indicate a significant risk of backward erosion piping as a failure mechanism for dikes. Traditional measures, such as berms or sheet pile walls take a lot of space or are expensive, in particular in areas with a high infrastructural density. Consequently, there is an urgent need for alternative piping measures. An innovative solution is the vertical sand-retaining geotextile, which has been developed and tested in the field. An optimisation of this method is a coarse sand barrier: a trench filled with coarse sand, covered by a clay layer. Laboratory and field scale tests suggest that this is an effective and economically feasible method. Volledige artikel
Interpretation of TA and DSS test on organic soft soil to derive strength parameters for dike design
H.J. Lengkeek, M. Brunetti, Geotechniek Special ECSMGE, September 2015, pagina 8
This paper presents the findings on the behaviour of organic soft soil (clay and peat) using a variety of state-of-the-art laboratory tests. Moreover it addresses the importance of critical evaluation of each test and the parameter determination. The tests are performed within a research program on behalf of research foundation “STOWA” to verify the stability of a local flood defence of the waterboard “Hoogheemraadschap van Delfland”. Oedometric tests (OED) and constant rate of strain tests (CRS) have been carried out to determine the preconsolidation stress, after which anisotropically K0-consolidated undrained triaxial tests (TA-ACU) and direct simple shear tests (DSS) have been executed with three different consolidation paths. Volledige artikel
Geotechnical foundation design for onshore wind turbines
J.E. Cools, Geotechniek Special ECSMGE, September 2015, pagina 18
The onshore wind industry is rapidly growing. This development requires a clear understanding of the geotechnical foundation behaviour of wind turbines in order to achieve a safe and economical foundation design. The foundation design however includes the selection of various types of foundations, design methodologies and mathematical models, ranging from basic to advanced. In some cases, standards are conflicting, or just lacking specific design guidelines for wind turbines. Based on extensive design experience some design considerations are described in this article. Volledige artikel