Publications

PhD thesis:
Habilitation thesis:
  • Soil behaviour under cyclic loading - experimental observations, constitutive description and applications
    PDF (140 MB)

Publications in journals:
  1. Wichtmann, T., Sonntag, T., Triantafyllidis, Th. (2001):
    On the memory capacity of sand under cyclic loading (in German),
    Bautechnik, Vol. 78, No. 12 , pp. 852 - 865.
    PDF (2.1 MB) The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.200105950).

  2. Wichtmann, T., Triantafyllidis, Th. (2004):
    Influence of a cyclic and dynamic loading history on dynamic properties of dry sand,
    part I: cyclic and dynamic torsional prestraining,
    Soil Dynamics and Earthquake Engineering, Vol. 24, No. 2, pp. 127 - 147.
    PDF (2.4 MB). The original publication is available at ScienceDirect (DOI: 10.1016/j.soildyn.2003.10.004).

  3. Wichtmann, T., Triantafyllidis, Th. (2004):
    Influence of a cyclic and dynamic loading history on dynamic properties of dry sand,
    part II: cyclic axial preloading,
    Soil Dynamics and Earthquake Engineering, Vol. 24, No. 11, pp. 789 - 803.
    PDF (2.7 MB). The original publication is available at ScienceDirect (DOI: 10.1016/j.soildyn.2004.05.002).

  4. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2005):
    Settlement accumulation in non-cohesive soils under cyclic loading (in German),
    Bautechnik, Vol. 82, No. 1, pp. 18-27.
    PDF (1.0 MB). The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.200590023).

  5. Wichtmann, T., Triantafyllidis, Th. (2005):
    Dynamic stiffness and damping of sand at small strains (in German),
    Bautechnik, Vol. 82, No. 4, pp. 236-246.
    PDF (1.5 MB) . The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.200590079).

  6. Niemunis, A., Wichtmann, T., Triantafyllidis, Th. (2005):
    A high-cycle accumulation model for sand,
    Computers and Geotechnics, Vol. 32, No. 4, pp. 245-263.
    PDF (2.5 MB). The original publication is available at ScienceDirect (DOI: 10.1002/bate.200590128).

  7. Wichtmann, T., Triantafyllidis, Th. (2005):
    On the influence of the grain size distribution curve on the dynamic and cumulative behaviour of non-cohesive soils (in German),
    Bautechnik, Vol. 82, No. 6, pp. 378-386.
    PDF (3.4 MB). The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.200590128).

  8. Wichtmann, T., Niemunis, A., Triantafyllidis, Th., Poblete, M. (2005):
    Correlation of cyclic preloading with the liquefaction resistance,
    Soil Dynamics and Earthquake Engineering, Vol. 25, No. 12, pp. 923-932.
    PDF (3.4 MB). The original publication is available at ScienceDirect (DOI: 10.1016/j.soildyn.2005.05.004).

  9. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2005):
    Strain accumulation in sand due to cyclic loading: drained triaxial tests,
    Soil Dynamics and Earthquake Engineering, Vol. 25, No. 12, pp. 967-979.
    PDF (1.0 MB). The original publication is available at ScienceDirect (DOI: 10.1016/j.soildyn.2006.04.001).

  10. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2005):
    Finite element prediction of the settlement of shallow foundations on sand under cyclic loading (in German),
    Bautechnik, Vol. 82, No. 12, pp. 902-911.
    PDF (1.1 MB). The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.200590253).

  11. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2006):
    Experimental evidence of a unique flow rule of non-cohesive soils under high-cyclic loading,
    Acta Geotechnica, Vol. 1, No. 1, pp. 59 - 73.
    PDF (2.2 MB). The original publication is available at www.springerlink.com (DOI: 10.1007/s11440-006-0006-8).

  12. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2006):
    Is Miner's rule valid for sand? (in German),
    Bautechnik, Vol. 83, No. 5, pp. 341 - 350.
    PDF (1.3 MB). The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.200610029).

  13. Wichtmann, T., Triantafyllidis, Th. (2006):
    On the correlation of the oedometric and the ''dynamic'' stiffness of non-cohesive soils (in German),
    Bautechnik, Vol. 83, No. 7, pp. 482 - 491.
    PDF (1.3 MB). The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.200610041).

  14. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2007):
    On the influence of the polarization and the shape of the strain loop on strain accumulation in sand under high-cyclic loading.
    Soil Dynamics and Earthquake Engineering, Vol. 25, No. 1, pp. 14-28.
    PDF (1.4 MB). The original publication is available at ScienceDirect (DOI: 10.1016/j.soildyn.2006.05.002).

  15. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2007):
    Strain accumulation in sand due to cyclic loading: drained cyclic tests with triaxial extension,
    Soil Dynamics and Earthquake Engineering, Vol. 27, No. 1, pp. 42-48.
    PDF (0.6 MB). The original publication is available at ScienceDirect (DOI: 10.1016/j.soildyn.2006.04.001).

  16. Rondon, H.A., Wichtmann, T., Triantafyllidis, Th., Lizcano, A. (2007):
    Hypoplastic material constants for a well-graded granular material (UGM) for base and subbase layers of flexible pavements,
    Acta Geotechnica, Vol. 1, No. 2, pp. 113-126.
    PDF (2.4 MB). The original publication is available at www.springerlink.com (DOI: 10.1007/s11440-007-0030-3).

  17. Rondon, H.A., Wichtmann, T., Triantafyllidis, Th., Lizcano, A. (2008):
    Behavior of an unbound granular material in cyclic triaxial tests with constant and variable confining pressure (in Spanish).
    Revista Chilena de Ingenieria, Vol. 16, No. 3, pp. 461-472.

  18. Poblete, M., Wichtmann, T. (2008):
    Accumulation of residual deformations due to cyclic loading with complicated strain loops.
    Obras y Proyectos, Revista de Ingenieria Civil, No. 4, pp. 43-51.

  19. Rondon, H.A., Wichtmann, T., Triantafyllidis, Th., Lizcano, A. (2009):
    Comparison of cyclic triaxial behavior of unbound granular material under constant and variable confining pressure,
    Journal of Transportation Engineering, ASCE, Vol. 135, No. 7, pp. 467-478.
    PDF (1.3 MB). The original publication is available in the ASCE Library (DOI: 10.1061/(ASCE)TE.1943-5436.0000009).

  20. Wichtmann, T., Triantafyllidis, Th. (2009):
    On the influence of the grain size distribution curve of quartz sand on the small strain shear modulus Gmax,
    Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 135, No. 10, pp. 1404-1418.
    PDF (3.0 MB). The original publication is available in the ASCE Library (DOI: 10.1061/(ASCE)GT.1943-5606.0000096).

  21. Wichtmann, T., Triantafyllidis, Th. (2009):
    On the correlation of ''static'' and ''dynamic'' stiffness moduli of non-cohesive soils (extended version in English),
    Bautechnik, Vol. 86, Special Issue S1 "Geotechnical Engineering", pp. 28-39.
    PDF (1.5 MB). The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.200910039).

  22. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2009):
    Prediction of long-term deformations of offshore wind power plants (in German),
    RUBIN. Scientific journal of Ruhr-University Bochum, Special Issue 2009 (Collaborate Research Centre SFB 398), pp. 14-21.
    PDF (1.3 MB).

  23. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2009):
    Validation and calibration of a high-cycle accumulation model based on cyclic triaxial tests on eight sands.
    Soils and Foundations, Vol. 49, No. 5, pp. 711-728.
    PDF (2.6 MB). The original publication is available at JStage.

  24. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2010):
    On the determination of a set of material constants for a high-cycle accumulation model for non-cohesive soils,
    International Journal for Analytical and Numerical Methods in Geomechanics, Vol. 34, No. 4, pp. 409-440.
    The original publication is available in the Wiley Online Library (DOI: 10.1002/nag.821).

  25. Wichtmann, T., Rondon, H.A., Niemunis, A., Triantafyllidis, T., Lizcano, A.: (2010)
    Prediction of permanent deformations in pavements using a high-cycle accumulation model.
    Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 136, No. 5, S. 728-740.
    PDF (2.5 MB). The original publication is available in the ASCE Library (DOI: 10.1061/(ASCE)GT.1943-5606.0000275).

  26. Wichtmann, T., Niemunis, A., Triantafyllidis, T. (2010):
    On the ''elastic'' stiffness in a high-cycle accumulation model for sand: a comparison of drained and undrained cyclic triaxial tests.
    Canadian Geotechnical Journal, Vol. 47, No. 7, pp. 791-805.
    PDF (5.6 MB). The original publication is available at Canadian Science Publishing (DOI: 10.1139/T09-142).

  27. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2010):
    Strain accumulation in sand due to drained cyclic loading: on the effect of monotonic and cyclic preloading (Miner's rule).
    Soil Dynamics and Earthquake Engineering, Vol. 30, No. 8, pp. 736-745.
    PDF (1.4 MB). The original publication is available at ScienceDirect (DOI: doi:10.1016/j.soildyn.2010.03.004).

  28. Wichtmann, T., Triantafyllidis, Th. (2010):
    On the influence of the grain size distribution curve on P-wave velocity, constrained elastic modulus Mmax and Poisson's ratio of quartz sands.
    Soil Dynamics and Earthquake Engineering, Vol. 30, No. 8, pp. 757-766.
    PDF (1.9 MB). The original publication is available at ScienceDirect (DOI: doi:10.1016/j.soildyn.2010.03.006).

  29. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2010):
    Prediction of long-term deformations of offshore wind power plant foundations (in German).
    HANSA International Maritime Journal, Vol. 147, No. 6, pp. 73-77.

  30. Wichtmann, T., Triantafyllidis, Th. (2011):
    Estimation of dynamic properties of non-cohesive soils based on the grain size distribution curve (in German).
    Bautechnik, Vol. 88, No. 9, pp. 627-639.
    PDF (2.1 MB). The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.201101498).

  31. Wichtmann, T., Triantafyllidis, Th. (2011):
    Prediction of long-term deformations of offshore wind power plants using an accumulation model (in German).
    Bautechnik, Vol. 88, No. 11, pp. 765-781.
    PDF (4.2 MB). The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.201101519).

  32. Wichtmann, T., Triantafyllidis, Th. (2013):
    Effect of uniformity coefficient on G/Gmax and damping ratio of uniform to well graded quartz sands.
    Journal of Geotechnical and Geoenvironmental Engineering, Vol. 139, No. 1, pp. 59-72.
    PDF (3.3 MB). The original publication is available in the ASCE Library (DOI: 10.1061/(ASCE)GT.1943-5606.0000735).

  33. Wichtmann, T., Andersen, K.H., Sjursen, M.A., Berre, T. (2013):
    Cyclic tests on high-quality undisturbed block samples of soft marine Norwegian clay.
    Canadian Geotechnical Journal, Vol. 50, No. 4, pp. 400-412.
    PDF (1.9 MB). The original publication is available at Canadian Science Publishing (DOI: 10.1139/cgj-2011-0390). Raw data (ZIP archive, 292 MB)

  34. Wichtmann, T., Triantafyllidis, Th. (2013):
    Small-strain constrained elastic modulus of clean quartz sand with various grain size distribution.
    Soil Dynamics and Earthquake Engineering, Vol. 55, No. 12, pp. 130-139.
    PDF (2.1 MB). The original publication is available at ScienceDirect (DOI: 10.1016/j.soildyn.2013.08.006).

  35. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2013):
    On the "elastic stiffness" in a high-cycle accumulation model - continued investigations.
    Canadian Geotechnical Journal, Vol. 50, No. 12, pp. 1260-1272.
    PDF (15.3 MB). The original publication is available at Canadian Science Publishing (DOI: 10.1139/cgj-2013-0037).

  36. Wichtmann, T., Triantafyllidis, Th. (2014):
    Stiffness and damping of clean quartz sand with various grain size distribution curves.
    Journal of Geotechnical and Geoenvironmental Engineering, Vol. 140, No. 3.
    PDF (0.5 MB). The original publication is available at ASCE Library (DOI: 10.1061/(ASCE)GT.1943-5606.0000977).

  37. Westermann, K., Zachert, H. Wichtmann, T. (2014):
    Vergleich von Ansätzen zur Prognose der Langzeitverformungen von OWEA-Monopilegründungen in Sand. Teil 1: Grundlagen der Ansätze und Parameterkalibration.
    Bautechnik 91, Nr. 5, S. 309-323.
    The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.201300094).

  38. Westermann, K., Zachert, H. Wichtmann, T. (2014):
    Vergleich von Ansätzen zur Prognose der Langzeitverformungen von OWEA-Monopilegründungen in Sand. Teil 2: Simulationen und Schlussfolgerungen.
    Bautechnik 91, Nr. 5, S. 324-332.
    The original publication is available in the Wiley Online Library (DOI: 10.1002/bate.201400015).

  39. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2014):
    Flow rule in a high-cycle accumulation model backed by cyclic test data of 22 sands.
    Acta Geotechnica, Vol. 9, No. 4, pp. 695-709.
    PDF (2.0 MB). The original publication is available at SpringerLink (DOI: 10.1007/s11440-014-0302-7).

  40. Niemunis, A., Wichtmann, T. (2014):
    Separation of time scale in the HCA model for sand.
    Acta Geophysica, Vol. 62, No. 5, pp. 1127-1145.
    The original publication is available at SpringerLink (DOI: 10.2478/s11600-014-0221-x).

  41. Wichtmann, T., Navarrete Hernandez, M.A., Triantafyllidis, Th. (2015):
    On the influence of a non-cohesive fines content on the small strain stiffness, modulus degradation and damping of quartz sand.
    Soil Dynamics and Earthquake Engineering, Vol. 69, No. 2, pp. 103-114.
    PDF (1.1 MB). The original publication is available at http://www.sciencedirect.com (DOI: 10.1016/j.soildyn.2014.10.017).

  42. Wichtmann, T., Triantafyllidis, Th. (2015):
    Stress attractors predicted by a high-cycle accumulation model confirmed by undrained cyclic triaxial tests.
    Soil Dynamics and Earthquake Engineering, Vol. 69, No. 2, pp. 125-137.
    PDF (23.4 MB). The original publication is available at http://www.sciencedirect.com (DOI: 10.1016/j.soildyn.2014.10.013).

  43. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2015):
    Improved simplified calibration procedure for a high-cycle accumulation model.
    Soil Dynamics and Earthquake Engineering, Vol. 70, pp. 118-132.
    PDF (4.8 MB). The original publication is available at http://www.sciencedirect.com (DOI: 10.1016/j.soildyn.2014.12.011).

  44. Wichtmann, T., Triantafyllidis, Th. (2015):
    Inspection of a high-cycle accumulation model for large numbers of cycles (N = 2 million).
    Soil Dynamics and Earthquake Engineering, Vol. 75, pp. 199-210.
    PDF (1.9 MB). The original publication is available at http://www.sciencedirect.com (DOI: 10.1016/j.soildyn.2015.04.008).

  45. Wichtmann, T., Triantafyllidis, Th. (2016):
    An experimental data base for the development, calibration and verification of constitutive models for sand with focus to cyclic loading.
    Part I: tests with monotonic loading and stress cycles.
    Acta Geotechnica, Vol. 11, No. 4, pp. 739-761.
    PDF (27.5 MB). The original publication is available at http://link.springer.com (DOI: 10.1007/s11440-015-0402-z).
    The raw test data presented in this paper is available under the link ''Karlsruhe fine sand database'' in the menu.

  46. Wichtmann, T., Triantafyllidis, Th. (2016):
    An experimental data base for the development, calibration and verification of constitutive models for sand with focus to cyclic loading.
    Part II: tests with strain cycles and combined loading.
    Acta Geotechnica, Vol. 11, No. 4, pp. 763-774.
    PDF (17.6 MB). The original publication is available at http://link.springer.com (DOI: 10.1007/s11440-015-0412-x).
    The raw test data presented in this paper is available under the link ''Karlsruhe fine sand database'' in the menu.

  47. Wichtmann, T., Kimmig, I., Triantafyllidis, Th. (2017):
    On correlations between ''dynamic'' (small-strain) and ''static'' (large-strain) stiffness moduli - an experimental investigation on 19 sands and gravels.
    Soil Dynamics and Earthquake Engineering, Vol. 98, pp. 72-83.
    PDF (1.3 MB). The original publication is available at http://www.sciencedirect.com (DOI: 10.1016/j.soildyn.2017.03.032).

  48. Wichtmann, T., Triantafyllidis, Th. (2017):
    Strain accumulation due to packages of cycles with varying amplitude and/or average stress - on the bundling of cycles and the loss of the cyclic preloading memory.
    Soil Dynamics and Earthquake Engineering, Vol. 101, pp. 250-263.
    PDF (0.7 MB). The original publication is available at http://www.sciencedirect.com (DOI: 10.1016/j.soildyn.2017.07.012).

  49. Wichtmann, T., Triantafyllidis, Th., Chrisopoulos, S., Zachert, H. (2017):
    Prediction of long-term deformations of offshore wind power plant foundations using engineer-oriented models based on HCA.
    International Journal of Offshore and Polar Engineering (IJOPE), Vol. 27, No. 4, pp. 346-356.

  50. Wichtmann, T., Triantafyllidis, Th. (2018):
    Monotonic and cyclic tests on Kaolin - a data base for the development, calibration and verification of constitutive models for cohesive soils with focus to cyclic loading.
    Acta Geotechnica, Vol. 13, No. 5, pp. 1103-1128.
    PDF (24.8 MB) The original publication is available at http://link.springer.com (DOI: 10.1007/s11440-017-0588-3).

  51. Machacek, J., Wichtmann, T., Zachert, H., Triantafyllidis, Th. (2018):
    Long-term settlements of a ship lock: measurements vs. FE-prediction using a high cycle accumulation model.
    Computers and Geotechnics, Vol. 97, May, pp. 222-232.
    The original publication is available at http://www.sciencedirect.com (DOI: 10.1016/j.compgeo.2018.01.009).

  52. Wichtmann, T., Machacek, J., Zachert, H., Günther, H. (2019):
    Validierung eines hochzyklischen Akkumulationsmodells anhand von Modellversuchen und Messungen an realen Bauwerken.
    Bautechnik, Vol. 96, No. 2.
    The original publication is available at https://onlinelibrary.wiley.com (DOI: doi.org/10.1002/bate.201800056).

  53. Wichtmann, T., Triantafyllidis, Th., Ziesmann, L. (2019):
    On the influence of platy shell particles on the cumulative deformations in sand under drained high-cyclic loading.
    Soil Dynamics and Earthquake Engineering, Vol. 117, pp. 1-15.
    The original publication is available at ScienceDirect (DOI: 10.1016/j.soildyn.2018.11.005).

  54. Wichtmann, T., Triantafyllidis, Th., Späth, L. (2019):
    On the influence of grain shape on the cumulative deformations in sand under drained high-cyclic loading.
    Soils and Foundations.

  55. Wichtmann, T., Steller, K., Triantafyllidis, Th., Back, M., Dahmen, D. (2019):
    An experimental parametric study on the liquefaction resistance of sands in spreader dumps of lignite opencast mines.
    Soil Dynamics and Earthquake Engineering.

  56. Wichtmann, T., Triantafyllidis, Th. (2019):
    On the influence of multiple polarization changes on the cumulative deformations in sand under drained high-cyclic loading.
    Geotechnical Testing Journal.


Discussions in journals:
  1. Niemunis, A., Wichtmann, T. (2005):
    Discussion of "Cyclic viscoelastic-viscoplastic constitutive model for non-cohesive soils and ballast'' (in German)
    of A. Gotschol and H.-G. Kempfert,
    Bautechnik, Vol. 82, No. 1, pp. 57-59.
    The original publication is available at www3.interscience.wiley.com (DOI: 10.1002/bate.200590035).

  2. Wichtmann, T., Triantafyllidis, Th. (2007):
    Reply to the discussion of T. Benz and P.A. Vermeer on
    "On the correlation of the oedometric and the ''dynamic'' stiffness of non-cohesive soils" (Bautechnik, Vol. 83, No. 7, 2006) (in German),
    Bautechnik, Vol. 84, No. 5, pp. 364-366
    The original publication is available at www3.interscience.wiley.com (DOI: 10.1002/bate.200790104).

Publications in conference proceedings:
  1. Niemunis, A., Wichtmann, T., Triantafyllidis, Th. (2003):
    Compaction of freshly pluviated granulates under uniaxial and multiaxial cyclic loading.
    XIIIth European Conference On Soil Mechanics and Geotechnical Engineering:
    Geotechnical problems with man-made and man-influenced grounds,
    Prague, August 2003, pp. 855 - 860. PDF (0.2 MB)

  2. Triantafyllidis, Th., Wichtmann, T., Niemunis, A. (2003):
    Explicit accumulation model for granular materials under multiaxial cyclic loading.
    Advances in Scattering and Biomedical Engineering, Proc. of the Sixth Int. Workshop,
    Tsepelovo, Greece 18 - 21 September 2003, Fotiadis, D.I., Massalas, C.V. (ed.), Word Scientific, pp. 394-405. PDF (0.6 MB)

  3. Niemunis, A., Wichtmann, T., Triantafyllidis, Th. (2004):
    Explicit accumulation model for cyclic loading.
    Cyclic Behaviour of Soils and Liquefaction Phenomena, Proc. of CBS04, Bochum, March/April 2004, Balkema, pp. 65 - 76. PDF (1.4 MB)

  4. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2004):
    Strain accumulation in sand due to drained uniaxial cyclic loading.
    Cyclic Behaviour of Soils and Liquefaction Phenomena, Proc. of CBS04, Bochum, March/April 2004, Balkema, pp. 233 - 246. PDF (1.2 MB)

  5. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2004):
    The effect of volumetric and out-of-phase cyclic loading on strain accumulation.
    Cyclic Behaviour of Soils and Liquefaction Phenomena, Proc. of CBS04, Bochum, March/April 2004, Balkema, pp. 247 - 256. PDF (1.2 MB)

  6. Triantafyllidis, Th., Wichtmann, T., Niemunis, A. (2004):
    On the determination of cyclic strain history.
    Cyclic Behaviour of Soils and Liquefaction Phenomena, Proc. of CBS04, Bochum, March/April 2004, Balkema, pp. 321 - 332. PDF (2.1 MB)

  7. Wichtmann, T. (2004):
    Explicit material model for the accumulation in con-cohesive soils under cyclic loading (in German).
    Special session ''Panel for young geotechnical engineers'' of 28th Baugrundtagung, Leipzig, September 2004, pp. 17 - 18. PDF (0.1 MB)

  8. Triantafyllidis, Th., Wichtmann, T., Niemunis, A. (2004):
    Cumulative and dynamic behaviour of soils (in German). Festschrift to 60th birthday of Prof. Savidis, TU Berlin, pp. 173-191. PDF (7.7 MB)

  9. Niemunis, A., Wichtmann, T., Triantafyllidis, Th. (2005):
    Settlements and pore pressure generation in sand during earthquakes - physical phenomena and their 1-D description.
    Fifth International Conference on Earthquake Resistant Engineering Structures, ERES 2005, Skiathos, Greece, pp. 13-22. PDF (0.3 MB)

  10. Niemunis, A., Wichtmann, T., Petryna, Y., Triantafyllidis, Th. (2005):
    Stochastic modelling of settlements due to cyclic loading for soil-structure interaction.
    9th International Conference on Structural Safety and Reliability, ICOSSAR 2005, Rome. PDF (0.5 MB)

  11. Wichtmann, T., Sellountos, E.I., Tsinopoulos, S.V., Niemunis, A., Papargyri-Beskou, S., Polyzos, D., Triantafyllidis, T., Beskos, D.E. (2005):
    Wave dispersion in dry sand by experimental, analytical and numerical methods.
    5th GRACM International Congress on Computational Mechanics, Limassol, Cyprus. PDF (0.3 MB)

  12. Niemunis, A., Wichtmann, T., Triantafyllidis, Th. (2005):
    Long term deformations in soils due to cyclic loading.
    in: Modern trends in geomechanics, International Workshop 2005, Vienna. PDF (2.0 MB)

  13. Niemunis, A., Wichtmann, T., Triantafyllidis, Th. (2007):
    On the definition of the fatigue loading for sand.
    in: International Workshop on Constitutive Modelling - Development, Implementation, Evaluation and Application, 12-13 January 2007, Hong Kong. PDF (0.4 MB)

  14. Niemunis, A., Wichtmann, T., Triantafyllidis, Th. (2007):
    Statial stress fluctuations: acoustic evidence and numerical simulations.
    Proc. of the Tenth International Symposium on Numerical Models in Geomechanics (NUMOG X), 25-27 April 2007, Rhodes, Greece, pp. 159-166. PDF (2.3 MB)

  15. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2007):
    Recent advances in constitutive modelling of compaction of granular materials under cyclic loading.
    Proc. of 8th HSTAM International Congress on Mechanics, 12-14 July, Patras, Greece, pp. 121-136. PDF (4.8 MB)

  16. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2007):
    Differential settlements due to cyclic loading and their effect on the lifetime of structures.
    Proc. of 3rd International Conference on Lifetime Oriented Design Concepts, 12-14 November, Bochum, pp. 357-364. PDF (0.7 MB)

  17. Wichtmann, T., Martinez, R., Duran-Graeff, F., Giolo, E., Hernandez, M., Triantafyllidis, Th. (2008):
    On the influence of the grain size distribution curve on the secant stiffness of quartz sand under cyclic loading.
    Proc. of 11th Baltic Sea Geotechnical Conference: Geotechnics in Maritime Engineering, 15-18 September, Gdansk, Poland, Vol. 1, pp. 315-322. PDF (1.0 MB)

  18. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2008):
    Prediction of long-term deformations for monopile foundations of offshore wind power plants.
    Proc. of 11th Baltic Sea Geotechnical Conference: Geotechnics in Maritime Engineering, 15-18 September, Gdansk, Poland, Vol. 2, pp. 785-792. PDF (0.3 MB)

  19. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2008):
    On the determination of the constants for a high-cycle model for sand.
    Proc. of Int. Conf. on Numerical Computation in Geotechnical Engineering (NUCGE 2008), 27-29 October, Skikda, Algeria. PDF (0.4 MB)

  20. Triantafyllidis, Th., Kudella, P., Wichtmann, T. (2009):
    Geotechnical robustness and deformation recovery effects of offshore wind turbine foundations.
    Third science days on the utilization of offshore wind energy by the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety, Oldenburg, 17-18 November 2009. PDF (0.4 MB)

  21. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2010):
    Recent improvements of a high-cycle accumulation model for sand.
    Workshop "Foundations of offshore wind power plants", Karlsruhe, Februar 2010.
    Publications of the Institute of Soil Mechanics and Rock Mechanics at Karlsruhe Institute of Technology (KIT), Issue No. 172, pp. 35-47. PDF (3.4 MB)

  22. Poblete, M., Wichtmann, T., Niemunis, A. (2010):
    Stochastic modelling of settlements (in German).
    Workshop "Foundations of offshore wind power plants", Karlsruhe, Februar 2010.
    Publications of the Institute of Soil Mechanics and Rock Mechanics at Karlsruhe Institute of Technology (KIT), Issue No. 172, pp. 99-112. PDF (1.1 MB)

  23. Wichtmann, T., Triantafyllidis, Th. (2010):
    On the influence of the grain size distribution curve on dynamic soil properties of quartz sand.
    Proc. of the Fifth International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, San Diego, USA. PDF (1.6 MB)

  24. Wichtmann, T., Rojas, B., Niemunis, A., Triantafyllidis, Th. (2010):
    Stress- and strain-controlled undrained cyclic triaxial tests on a fine sand for a high-cycle accumulation model.
    Proc. of the Fifth International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, San Diego, USA. PDF (1.5 MB)

  25. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2010):
    Simplified calibration procedure for a high-cycle accumulation model based on cyclic triaxial tests on 22 sands.
    International Symposium: Frontiers in Offshore Geotechnics, Perth, Australia. PDF (3.5 MB)

  26. Wichtmann, T., Niemunis, A., Triantafyllidis, Th. (2010):
    Application of a high-cycle accumulation model for the prediction of permanent deformations of the foundations of offshore wind power plants.
    International Symposium: Frontiers in Offshore Geotechnics, Perth, Australia. PDF (0.5 MB)

  27. Wichtmann, T., Rojas, B., Niemunis, A., Triantafyllidis, Th. (2011):
    Prediction of drained and undrained cyclic behaviour of a fine sand using a high-cycle accumulation model.
    Fifth International Conference on Earthquake Geotechnical Engineering, Santiago, Chile. PDF (5.3 MB)

  28. Wichtmann, T., Navarette Hernandez, M., Martinez, R., Duran Graeff, F., Giolo, E., Triantafyllidis, Th. (2011):
    Estimation of the small-strain stiffness of granular soils taking into account the grain size distribution curve.
    Fifth International Conference on Earthquake Geotechnical Engineering, Santiago, Chile. PDF (1.6 MB)

  29. Poblete M., Wichtmann T., Triantafyllidis Th. (2011):
    Residual deformations due to long-time cyclic loading with two dimensional strain loops.
    Fifth International Conference on Earthquake Geotechnical Engineering, Santiago, Chile. PDF (1.0 MB)

  30. Wichtmann T., Triantafyllidis Th. (2011):
    Prediction of permanent deformations due to cyclic loading with varying amplitude: A discussion of different approaches (in German).
    Workshop "Foundations of offshore wind power plants", 22. - 23. March 2011, Berlin.
    Publications of the Institute of Foundation Engineering at Technical University Berlin, Issue No. 56. PDF (1.0 MB)

  31. Zachert, H., Wichtmann, T., Kudella, P. (2012):
    Foundations of offshore wind power plants under high-cyclic loading - serviceability limit state (in German).
    Erste Jahrestagung des Zentrums für Energie des KIT im Juli 2012, Karlsruhe.

  32. Westermann, K., Zachert, H., Wichtmann, T. (2013):
    Comparison of different models for the prediction of the long-term deformations of monopile foundations for offshore wind power plants.
    Pfahl-Symposium, Braunschweig.

  33. Niemunis, A., Wichtmann, T., (2013):
    Separation of time scale in the HCA model for sand.
    XVI French-Polish Colloquium of Soil and Rock Mechanics. Multiscale Modelling in Soil and Rock Mechanics Montpellier, 8-10 July.

  34. Triantafyllidis, Th., Wichtmann, T., Fuentes, W. (2013):
    Ultimate limit and serviceability state of soils unter cyclic loading (in German).
    1st German Soil Mechanics Conference, Bochum. Springer.

  35. Zachert, H., Wichtmann, T., Kudella, P., Triantafyllidis, Th., Hartwig, U. (2014):
    Validation of a high cycle accumulation model via FE-simulations of a full-scale test on a gravity base foundation for offshore wind turbines.
    International Wind Engineering Conference, IWEC 2014, Hannover.

  36. Zachert, H., Wichtmann, T., Triantafyllidis, Th., Hartwig, U. (2015):
    Simulation of a full-scale test on a Gravity Base Foundation for Offshore Wind Turbines using a High Cycle Accumulation Model.
    3rd International Symposium on Frontiers in Offshore Geotechnics (ISFOG), Oslo.

  37. Cuitino, M., Poblete, M., Wichtmann, T., Triantafyllidis, Th. (2015):
    Prediction of permanent settlements of foundations on Bío Bío sand subjected to high-cyclic loading.
    XV Panamerican Conference on Soil Mechanics and Geotechnical Engineering, Buenos Aires, Argentinien.

  38. Wichtmann, T. (2015):
    New findings regarding the behaviour of soils under cyclic loading.
    2nd German Soil Mechanics Conference, Bochum, Germany, Springer.

  39. Niemunis, A., Grandas Tavera, C.E., Wichtmann, T. (2015):
    Peak stress obliquity in drained and undrained sands. Simulations with neohypoplasticity.
    In: Holistic Simulation of Geotechnical Installation Processes.
    Proc. of 4th International Workshop FOR1136 GEOTECH. December 7th and 8th, 2015, Karlsruhe, S. 85-114.

  40. Wichtmann, T., Triantafyllidis, Th. (2016):
    New findings from long-term cyclic laboratory tests and their consequences for offshore wind power plant foundations.
    26th International Ocean and Polar Engineering Conference (ISOPE-2016), Rhodos.

  41. Triantafyllidis, Th., Wichtmann, T., Chrisopoulos, S., Zachert, H. (2016):
    Prediction of long-term deformations of offshore wind power plant foundations using engineer-oriented models based on HCA.
    26th International Ocean and Polar Engineering Conference (ISOPE-2016), Rhodos.

  42. Zachert, H., Wichtmann, T., Triantafyllidis, Th. (2016):
    Soil structure interaction of foundations for offshore wind turbines.
    26th International Ocean and Polar Engineering Conference (ISOPE-2016), Rhodos.

  43. Wichtmann, T. (2018):
    Untersuchungen zur Gebrauchstauglichkeit bei Gründungen von Offshore-Windenergieanlagen.
    Beiträge zum Tag des Instituts für Konstruktiven Ingenieurbau. Bauhaus-Universität Weimar.

  44. Wichtmann, T. (2018):
    Untersuchungen zur Gebrauchstauglichkeit bei Gründungen von Offshore-Windenergieanlagen.
    Ohde-Kolloquium 2018 - Aktuelle Themen der Geotechnik, Dresden.

  45. Wichtmann, T. (2018):
    Soils under high- and low-cycle loading - experiments vs. predictions by constitutive models.
    Desiderata Geotechnica - in honor of Prof. Gudehus' 80th birthday.
    Proceedings of the Special Session held during the China-Europe Conference on Geotechnical Engineering, Vienna.