Keywords and Phrases
Deep Foundation; Group Effect; Micropiles; Numerical Modelling; Weathered Rock
"A 5-span bridge along the Foothills Parkway of the Great Smoky Mountains, TN, was recently completed. Two out of the four piers were instrumented to measure the load transfer in the foundations. The foundations consisted of twenty 10-inch micropiles under the pile cap for each pier. Strain gages were installed and monitored at the different stages of construction. The objective of this research is to examine the interaction between the ground and micropiles using the field data performance and numerical modelling. The 3D computer model consists of the micropile foundation within the steep rock bedding planes and overburden soils. The field strains matched with numerical modelling results. In the overburden soil, the load transfer was not significant up to interface friction of 0.3 between the micropile and the ground. In addition, the weathered rock in the cased of the long micropiles transfers significant load although it has small friction with the micropile and this is due to the intermediate value of stiffness. Therefore, the bond zone of the long micropiles carries small percentage of the load. In addition, short micropiles carry much higher because the high stiffness rock is closer to the load source. Also, that load transfer behavior of a single micropiles and group micropiles with S/D=3.9 are almost identical. Parametric study showed that the load transfer mechanism is affected by the friction and the elasticity modulus and any of these factors by itself cannot guarantee a good load transfer. In addition, Poisson's ratio as well as plasticity parameters including friction angle, dilation angle and cohesion showed small effect on the load transfer mechanism."--Abstract, page iii.
Rogers, J. David
Civil, Architectural and Environmental Engineering
M.S. in Civil Engineering
Missouri University of Science and Technology
xvii, 187 pages
Great Smoky Mountains (N.C. and Tenn.)
© 2015 Audai Kamal Theinat, All rights reserved.
Thesis - Open Access
Soil mechanics -- Mathematical models
Bridges -- Great Smoky Mountains (N.C. and Tenn.) -- Foundations and piers
Electronic OCLC #
Link to Catalog Record
Theinat, Audai Kamal, "3D numerical modelling of micropiles interaction with soil & rock" (2015). Masters Theses. 7421.