Browsing by Author "Dr. Roy Borden, Committee Member"

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    Assessment of Superposition as a Design Framework for the Combined Effects of Soil Improvement and Foundation Remediation
    (2004-10-22) Manke, Jonathan Peter; Dr. M S Rahman, Committee Member; Dr. Debra Laefer, Committee Chair; Dr. Roy Borden, Committee Member
    The problem of pile foundation reuse provides an ideal opportunity to evaluate the validity of superposition as a design paradigm for ground intervention and ground reinforcement (GIGR) techniques when used in combination with in situ foundations. Grouted, helical piers, a relatively new technology, are proposed as a capacity improvement option for existing pile foundations. The relationship between these geotechnical elements was evaluated through the axial and lateral testing of small-scale, cast-in-place foundations in uniform, dry sand. These tests showed that the implementation of ground modification techniques caused an increase in the axial and lateral load-deflection performance of the foundation, with superposition as the most probable design methodology.
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    Models for Prediction of Surface Vibrations from Pile Driving Records
    (2006-12-08) Robinson, Brent Ross; Dr. Mohammed Gabr, Committee Chair; Dr. Roy Borden, Committee Member; Dr. Mervyn Kowalsky, Committee Member
    This study compares high strain dynamic testing measurements taken near the top of a driven pile to peak particle velocities on the ground surface and sound levels detected in the air some distance from the pile during driving. Based on a sample of installation records from 16 piles driven at the Marquette Interchange Project in Milwaukee, Wisconsin, a series of peak particle velocity plots versus distance, energy and scaled distance were created using traditional horizontal distance and rated hammer energy. These plots were modified using the seismic distance, the diesel hammer potential energy from the calculated stroke, and the energy transferred to the pile top. Incorporating these measurements tended to reduce some of the scatter in the data. More importantly, it was also discovered that components of peak particle velocity in the ground can be well correlated to the total pile resistance measured by dynamic testing. A plot of total resistance versus depth often independently yields the same shape curve as a plot of at least one component of peak particle velocity versus depth. A simple mathematical attenuation model is proposed as an initial step toward utilizing this relationship to predict at least one component of ground motions. Measured peak overpressure (noise) in the air correlated less directly to the quantities measured on the pile, but a conservative and simple mathematical model can still be proposed based on the dynamic testing-measured velocity near the pile top and idealized sound generation and attenuation theories.