Effects of Creep and Pore Pressure Diffusion on Shear Strength of Saturated Clay
Publication: Geo-Congress 2024
ABSTRACT
This paper presents a numerical study into the competing influences of creep and pore pressure dissipation (diffusion) on the shear resistance of a stratum of saturated clay. The analyses comprised fully coupled mechanical-flow simulations using the user-defined viscoplastic constitutive model PM4SiltR in the finite difference program FLAC 8.1. Simulations were performed for a single soil layer under infinite slope loading conditions (analogous to simple shear loading). A target shear stress was imposed under undrained conditions, after which pore pressure diffusion was initiated while the target shear stress was maintained constant. Analysis results illustrate the competing influences of consolidation and creep on the pore pressures at different depths within the clay layer. Results are presented for cases that do and do not lead to undrained creep rupture. A framework that relates rate of consolidation characteristics and sustained static shear stress levels to the potential for creep failure is presented. The practical implications of the results are discussed.
Get full access to this article
View all available purchase options and get full access to this chapter.
REFERENCES
Boulanger, R. W., and Ziotopoulou, K. 2019. “A constitutive model for clays and plastic silts in plane-strain earthquake engineering applications.” Soil Dynamics and Earthquake Engineering, 127(2019): 105832. DOI: 10.1016/j.soildyn.2019.105832.
Boulanger, R. W., Ziotopoulou, K., and Oathes, T. J. 2022. “PM4SiltR: A silt plasticity model with rate effects for slope stability applications.”, Center for Geotechnical Modeling, University of California, Davis.
Campanella, R. G., and Vaid, Y. P. 1974. Triaxial and plane strain creep rupture of an undisturbed clay. Canadian Geotechnical Journal, 11(1), 1–10.
Duncan, J. M., Wrights, S. G., and Brandon, T. L. 2014. Soil strength and slope stability. 2nd ed, New York: Wiley.
Itasca. 2019. Fast Lagrangian Analysis of Continua (FLAC), release 8.1. Itasca Consulting Group, Inc., Minneapolis, MN.
Kulhawy, F. H., and Mayne, P. W. 1990. Manual on estimating soil properties for foundation design., Electric Power Research Institute, Palo Alto, CA.
Ladd, C. C. 1991. “Stability evaluation during staged construction.” Journal of Geotechnical Engineering. 117 (4). https://doi.org/10.1061/(ASCE)0733-9410(1991)117:4(540).
Oathes, T. J. 2022. Accounting for viscous effects in nonlinear analyses of strain softening clays. Dissertation. University of California, Davis.
Oathes, T. J., and Boulanger, R. W. 2023. “Effect of viscoplasticity on localization in saturated clays and plastic silts.” Journal of Geotechnical and Geoenvironmental Engineering, ASCE, 149(4): 04023016, https://doi.org/10.1061/JGGEFK.GTENG-10984.
Shewbridge, S. 2019. “Undrained strengths and long-term stability of slopes.” ASCE Journal of Geotechnical and Geoenvironmental Engineering. 145 (11). https://doi.org/10.1061/(ASCE)GT.1943-5606.0002140.
Taylor, D. W. 1948. Fundamentals of soil mechanics. John Wiley and Sons, New York. 700 pp.
USACE. 2003. Slope stability, engineer manual 1110-2-1902. Washington, D.C: USACE.
Information & Authors
Information
Published In
History
Published online: Feb 22, 2024
ASCE Technical Topics:
- Continuum mechanics
- Creep
- Diffusion
- Diffusion (porous media)
- Dynamics (solid mechanics)
- Engineering mechanics
- Fluid mechanics
- Geomechanics
- Geotechnical engineering
- Hydrologic engineering
- Material mechanics
- Material properties
- Materials characterization
- Materials engineering
- Pore pressure
- Pressure (type)
- Rheology
- Saturated soils
- Shear resistance
- Shear strength
- Shear stress
- Soft soils
- Soil dynamics
- Soil mechanics
- Soil pressure
- Soils (by type)
- Solid mechanics
- Strength of materials
- Stress (by type)
- Structural analysis
- Structural engineering
- Thermodynamics
- Transport phenomena
- Viscosity
- Water and water resources
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.