Eighth International Conference on Case Histories in Geotechnical Engineering
Load Transfer Mechanism of Micropiles in Weathered Rock
Publication: Geo-Congress 2019: Foundations (GSP 307)
ABSTRACT
The load transfer mechanism of micropiles was examined for a bridge during construction in the Foothills Parkway of the Great Smoky Mountains in Tennessee. The bridge is supported on four piers and each rests on a circular pile cap with 20 micropiles socketed into rock with varying depths. The ground is characterized by 4 to 50-ft of sand and gravel overlying metaconglomerate and metasandstone rock. The load transfer of the piers was monitored using strain gages installed along the micropiles cased and bond zones, as well as in the pile cap. In addition, a 3D numerical model was developed using ABAQUS to understand the behavior. Using the collected data from the instrumentation and the numerical simulations, it was found that the weathered rock in the cased zone of the micropiles transfers a significant load (>70% of the total load) despite the small friction at the interface.
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REFERENCES
Armour, T., Groneck, P., Keeley, J., & Sharma, S. (2000). Micropile Design and Construction Guidelines-Implementation Manual, U.S. Department of Transportation, Report FHWA-SA-97–070, Washington, D.C.
Dixon, D. (2013). “Monitoring micropile foundations of bridge during construction.” MS thesis, Civil Engineering. Missouri University of Science and Technology, Rolla, MO.
Ghorbani, A., Hasanzadehshooiili, H., Ghamari, E., & Medzvieckas, J. (2014). “Comprehensive three-dimensional finite element analysis, parametric study and sensitivity analysis on the seismic performance of soil–micropile-superstructure interaction”. Soil Dynamics and Earthquake Engineering, 58, 21–36.
Kershaw, K. A. (2011). “Micropile response to combined loading” PhD thesis, Civil Engineering. Missouri University of Science and Technology, Rolla, MO.
Luna, R., Dixon, D. T., Kershaw, K. A., & Siegel, T. C. (2015). “Monitoring micropile foundations of bridge during construction.” Proc., International Foundations Congress and Equipment Expo (IFCEE), San Antonio, 878–889.
Misra, A. and C.-H. Chen (2004). "Analytical solution for micropile design under tension and compression." Geotechnical & Geological Engineering 22(2): 199–225.
National Park Service (NPS) (1998). Great Smoky Mountains National Park-Foothills Parkway History. US Department of the Interior, Washington, D.C.
Siegel, T.C. and Thompson, W.R., III (2010). Foothills Parkway Bridge No. 2 Geotechnical Report. Dan Brown and Associates Consulting Geotechnical Engineers, Sequatchie, TN.
Theinat, A. K. (2015). “3D numerical modelling of micropiles interaction with soil & rock”. MS thesis, Missouri University of Science and Technology, Rolla, MO.
Wang, Z., Mei, G., Cai, G., & Yu, X. (2009). “Dynamic finite element analysis of micropile foundation in subgrade.” Recent Advancement in Soil Behavior, in Situ Test Methods, Pile Foundations, and Tunneling: Selected Papers from the 2009 GeoHunan International Conference, 139–144.
Information & Authors
Information
Published In
Geo-Congress 2019: Foundations (GSP 307)
Pages: 55 - 62
Editors: Christopher L. Meehan, Ph.D., University of Delaware, Sanjeev Kumar, Ph.D., Southern Illinois University Carbondale, Miguel A. Pando, Ph.D., University of North Carolina Charlotte, and Joseph T. Coe, Ph.D., Temple University
ISBN (Online): 978-0-7844-8209-4
Copyright
© 2019 American Society of Civil Engineers.
History
Published online: Mar 21, 2019
ASCE Technical Topics:
- Construction engineering
- Construction industry
- Construction management
- Design (by type)
- Deterioration
- Engineering fundamentals
- Foundations
- Geology
- Geotechnical engineering
- Hydraulic engineering
- Hydraulic structures
- Infrastructure construction
- Load factors
- Load transfer
- Materials characterization
- Materials engineering
- Micro piles
- Models (by type)
- Numerical models
- Piers
- Pile foundations
- Piles
- Ports and harbors
- Rocks
- Structural design
- Water and water resources
- Weathering
Authors
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