Masters Theses

Keywords and Phrases

Deep Foundation; Group Effect; Micropiles; Numerical Modelling; Weathered Rock

Abstract

"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.

Advisor(s)

Luna, Ronaldo

Committee Member(s)

Rogers, J. David
ElGawady, Mohamed

Department(s)

Civil, Architectural and Environmental Engineering

Degree Name

M.S. in Civil Engineering

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2015

Pagination

xvii, 187 pages

Note about bibliography

Includes bibliographical references (pages 181-186).

Geographic Coverage

Great Smoky Mountains (N.C. and Tenn.)

Rights

© 2015 Audai Kamal Theinat, All rights reserved.

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Soil mechanics -- Mathematical modelsSoil-structure interactionBridges -- Great Smoky Mountains (N.C. and Tenn.) -- Foundations and piers

Thesis Number

T 10699

Electronic OCLC #

913516357

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