Graduate Thesis Or Dissertation
 

Blast-induced liquefaction : observational estimation of vibration, settlement and residual pore water pressure

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/rx913v81k

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  • The blast technique has been used as an effective soil improvement method to compact loose coarse-granular soils since 1930s, and the use of the blast technique is extended as an application of in-situ liquefaction testing to investigate the performance of full scale foundations and countermeasures against liquefaction in recent decades. Several guidelines have been provided to determine optimum blast specification; however “Trial and Error” is mostly used in designing blast-induced liquefaction. Then, the mechanism of blast-induced liquefaction is still poorly understood. Accordingly, not consistent design procedures for blast-induced liquefaction has effectively been used in various types of soils. The objective of this work is to improve the relationship between explosive energy and ground vibration, ground surface settlement, and residual pore water pressure resulting from blast-induced liquefaction. In order to achieve this objective, the data from USA, Japan, Canada, and New Zealand, including blast densification and in-situ liquefaction testing in terms of explosive, are collected and screened for quality. The new energy put accounting for multiple blasts is proposed, and the new empirical models are developed. Explosive is only a source relating to phenomena from blast-induced liquefaction. Vibration, settlement, and residual pore water pressure can be predicted based on the contribution of explosive energy. The developed models are useful as a preliminary tool for engineers to design blast-induced liquefaction testing safely.
  • Keywords: blast densification, dynamic soil compaction, blast-induced vibration, blast-induced liquefaction
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file details KatoKengo2017.pdf 2017-11-08 Público Descargar