Predicting the Impacts of Extreme Hydroclimatic Events on the Behavior of Drilled Shafts
Publication: Geo-Congress 2023
ABSTRACT
In this study, the effect of extreme hydroclimatic events, including heavy rainfall and drought, on the behavior of drilled shaft was predicted using a numerical method and will be validated using the proposed experimental method. For numerical analysis, a new modified Mohr-Coulomb constitutive model, which updates the yield criterion and modulus with changes in the matric suction and/or degree of saturation, was used in the coupled geotechnical-hydrological finite element code PLAXIS 2D. First, a full-scale model with a 1.0 m diameter and 12 m long drilled shaft was modeled separately in the sand and silty sand, then subjected to a constant mechanical load and varying extreme hydrological loads. Then, the analysis was repeated for a small-scale model with a 76 mm diameter and 1.83 m long drilled shaft and compared with the results of the full-scale model. The results indicated significant changes in the bearing capacity of the full-scale drilled shaft in both soils due to hydrological loads. The materials and methods adopted for the experimental method to validate the small-scale model are discussed.
Get full access to this article
View all available purchase options and get full access to this chapter.
REFERENCES
ACI Committee 543. (2012). Design, Manufacture, and Installation of Concrete Piles.
Aviles Engineering Corporation. (2010). Geotechnical Investigation, City of Houston, Surface Water Transmission Program, Houston, Texas (p. 65). Houston, Texas: Aviles Engineering Corporation.
Bentley. (2021). PLAXIS 2D- Reference Manual.
Fredlund, D. G., Morgenstern, N. R., and Widger, R. A. (1978). “The shear strength of unsaturated soils.” Can. Geotech. J, 15 (3), 313–321.
Fredlund, D. G., Rahardjo, H., and Fredlund, M. D. (2012). Unsaturated Soil Mechanics in Engineering Practice, Wiley, Chichester, U.K.
IPCC. (2013). Climate Change 2013: The Physical Science Basis. Cambridge University Press.
Kulhawy, F. H., and Mayne, P. W. (1990). Manual on Estimating Soil Properties for Foundation Design., Electric Power Research Institute, Palo Alta, CA.
Lee, K., and Seed, H. (1967). Drained Strength Characteristics of Sands. Journal Of The Soil Mechanics And Foundations Division, 93(6), 117–141.
Mahmoudabadi, V., and Ravichandran, N. (2021). Impact of Site-Specific Extreme Hydrological Cycle on Footing Performance. Geo-Extreme 2021.
Ravichandran, N., Vickneswaran, T., Marathe, S., and Jella, V. (2021). Numerical Analysis of Settlement Response of Shallow Footing Subjected to Heavy Rainfall and Flood Events. International Journal of Geosciences, 12(02), pp.138–158.
Reese, L. C., and O’Neill, M. W. (1988). “Drilled Shafts: Construction Procedures and Design Methods.”.
Siemens, G. (2018). Thirty-Ninth Canadian Geotechnical Colloquium: Unsaturated soil mechanics — bridging the gap between research and practice. Canadian Geotechnical Journal, 55(7), pp.909–927.
van Genuchten, M. T. (1980). “A closed-form equation for predicting the hydraulic conductivity of unsaturated soils,” Soil Science Society of American Journal, 44(5), 892–898.
Wolff, T. F. (1989). “Pile Capacity Prediction Using Parameter Functions.”Predicted and Observed Axial Behavior of Piles, Results of a Pile Prediction Symposium, sponsored by the Geotechnical Engineering Division, ASCE, Evanston, IL (June) 1989, ASCE Geotechnical Special Publication 23, 96–106.
Yamamuro, J., and Lade, P. (1997). Static liquefaction of very loose sands. Canadian Geotechnical Journal, 34(6), 905–917.
Vickneswaran, T., and Ravichandran, N. (2022). “A new constitutive model and its application for understanding the impacts of extreme hydroclimatic events on geotechnical systems,” International Journal of Geomechanics- Under review.
Information & Authors
Information
Published In
Geo-Congress 2023
Pages: 588 - 598
History
Published online: Mar 23, 2023
ASCE Technical Topics:
- Analysis (by type)
- Design (by type)
- Drilled pier foundations
- Drilled shafts
- Engineering fundamentals
- Foundations
- Geotechnical engineering
- Hydrologic models
- Load factors
- Methodology (by type)
- Models (by type)
- Numerical analysis
- Numerical methods
- Research methods (by type)
- Scale models
- Shafts
- Structural design
- Tunnels
- Validation
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.