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MS Final Examination – Marissa Rauthause

Frictional Response of Sand-Timber Pile Interfaces

Friday, November 17, 2017 1:00 PM - 3:00 PM

Student: Marissa Rauthause

Advisor: Dr. Armin Stuedlein

Abstract: This study focuses on the experimental response of soil-timber interfaces between a granular soil and three timber species and preparation conditions using laboratory experiments in order to improve our understanding of the frictional response of timber piles under commonly-experienced normal effective stresses. The experiments conducted in this study include a characterization of the timber species, the sandy soil, and the soil-timber interfaces. The frictional response of the sand was characterized by a series of direct simple shear and direct shear tests at various relative densities and effective normal stresses. Interface shear tests on sand-timber interfaces were performed with the sand prepared at relative densities of 45% and 75%, and applied effective normal stresses ranging from 15 to 150 kPa. This study concludes that the ratio φ / δ for wood is not independent of soil density and normal stress at low overburden stress, and that the ratio φ / δ regularly exceeds values recommended and observed in the literature for timber interfaces. The study concludes with a demonstration of the experimental findings within common shaft resistance design calculations and compares the results to methods presently recommended in various design guidelines.


Owen Hall (campus map)
103
Michelle McAllaster
michelle.mcallaster at oregonstate.edu
Sch of Civil/Constr Engr
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