Quantitative Geotechnical Characterization of Seismic Strengthening Effect on Subaquatic Slope Stability
Ting-Wei Wu | Marum
This project consists in a laboratory based, generic study that aims at quantifying the strengthening effect of earthquake loading on marine slope sediment deposits. The main goal is to explore the nature and significance of seismic strengthening in sediments of different mineralogical and grain size compositions. Expected scientific outcome is to enhance our understanding of:
- Seismic strengthening of granular material and its dependence on parameters such as the seismic intensity, number of seismic events and overburden stresses.
- Seismic strengthening of geotechnically more complex types of soils, for example silts, clays, sand-silt-clay mixtures, tephra, and diatom ooze.
- Case study on natural samples incorporating real earthquake signals.
The MARUM Dynamic Triaxial Testing Device (description in Kreiter et al., 2010) is the essential apparatus to investigate marine sediment’s shear strength under static and cyclic loading conditions. Cyclic tests are carried out on different kinds of samples and will also be complemented using machines at Ifremer, NGI or Fugro laboratories during the secondments (extended research stays). Additional geotechnical methods to fully characterize the tested materials will also be used.
Kreiter, S., Moerz, T., Strasser, M., Lange, M., Schunn, W., Schlue, B.F., Otto, D., Kopf, A., 2010. Advanced Dynamic Soil Testing — Introducing the New Marum Dynamic Triaxial Testing Device, in: Submarine Mass Movements and Their Consequences, Advances in Natural and Technological Hazards Research. Springer, Dordrecht, pp. 31–41. https://doi.org/10.1007/978-90-481-3071-9_3