Longitudinal and Shear Wave Velocities Measurement in Compacted Bentonite for Water Content

Shun Kimura, Kazumi Kitayama, Hideharu Takahashi, Kazushi Kimoto, Katsuyuki Kawamura, Hiroshige Kikura

    Research output: Contribution to journalConference articlepeer-review


    Bentonite is a good candidate of buffer material for disposal repository of high-level radioactive waste. Understanding groundwater behavior in bentonite buffer material is important in order to evaluate the bentonite buffer performance and guarantee long-term safety. Elastic constants of the bentonite buffer material are important parameters for the long-term safety. Water content in buffer material may have an influence on its elastic properties. For this reason, the monitoring system of the water saturation level in compacted bentonite is required. In this study, the ultrasonic velocity measurement method for evaluation of water content in compacted bentonite was proposed. At first, the effect of a degree of saturation in compacted bentonite on the longitudinal and shear wave velocities was investigated experimentally. In addition, the elastic property, bulk modulus, in unsaturated compacted bentonite were evaluated by ultrasonic velocities. As a result, it can be confirmed that ultrasonic velocities can evaluate a degree of saturation and bulk modulus of compacted bentonite.

    Original languageEnglish
    Article number01016
    JournalE3S Web of Conferences
    Publication statusPublished - Jun 29 2018
    Event6th International Energy Conference: Innovative Sustainable System in Energy - Food - Water Nexus, ASTECHNOVA 2017 - Yogyakarta, Indonesia
    Duration: Nov 1 2017 → …

    ASJC Scopus subject areas

    • General Environmental Science
    • General Energy
    • General Earth and Planetary Sciences


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