Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

Global warming is one of the most serious problems which faced by civil engineers in this century. Because a wood can store carbon within itself, the utilization of wood in the construction projects may contribute to the mitigation of global warming. The technique of ground improvement by installing logs into loose sand layer as a countermeasure against soil liquefaction was proposed in this study. The logs had been used as pile foundation until 1950's in Japan. However, as the wood has high possibility of a decrease in strength by decay, the utilization of wood become minority in the construction projects. First, since a lot of former wooden piles were found at the riverbed of the Asuwa River in Japan in 2005, the soundness of wood was evaluated. From the test results, it was confirmed that the level of decay was extremely low and the compression strength exceeded the allowable stress of wood pile, though they were buried under the riverbed for 59 years. Second, small scale shaking table tests in a 1-g gravity field were carried out using a composite ground which was made of loose saturated sand layer and the improved ground by piling with logs. It was clarified that the logs installed in liquefiable soil layer could increase the resistance of ground against liquefaction and decrease the settlement of structure.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Liquefaction Countermeasure Technique by Using Logs for Carbon Storage Against Global Warming

San Diego, California

Global warming is one of the most serious problems which faced by civil engineers in this century. Because a wood can store carbon within itself, the utilization of wood in the construction projects may contribute to the mitigation of global warming. The technique of ground improvement by installing logs into loose sand layer as a countermeasure against soil liquefaction was proposed in this study. The logs had been used as pile foundation until 1950's in Japan. However, as the wood has high possibility of a decrease in strength by decay, the utilization of wood become minority in the construction projects. First, since a lot of former wooden piles were found at the riverbed of the Asuwa River in Japan in 2005, the soundness of wood was evaluated. From the test results, it was confirmed that the level of decay was extremely low and the compression strength exceeded the allowable stress of wood pile, though they were buried under the riverbed for 59 years. Second, small scale shaking table tests in a 1-g gravity field were carried out using a composite ground which was made of loose saturated sand layer and the improved ground by piling with logs. It was clarified that the logs installed in liquefiable soil layer could increase the resistance of ground against liquefaction and decrease the settlement of structure.