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http://dx.doi.org/10.7843/kgs.2019.35.7.41

Evaluation on Compression Wave Velocities and Moduli of Gyeongju Compacted Bentonite  

Balagosa, Jebie (Dept. of Civil & Environmental Engrg., Kongju National Univ.)
Yoon, Seok (Radioactive Waste Disposal Research Division, KAERI)
Choo, Yun Wook (Dept. of Civil & Environmental Eng., Kongju National Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.35, no.7, 2019 , pp. 41-50 More about this Journal
Abstract
Gyeongju bentonite is a buffer material primarily considered in Korea and it is highly compacted as a part of an engineered barrier system (EBS) of high-level radioactive waste repository. The compacted bentonite undergoes swelling stress by groundwater penetration and thermal stress by decay heat from a canister. Therefore, the mechanical properties of the compacted bentonite buffer material is crucial for the performance assessment of EBS. This paper aims to evaluate deformation properties of Gyeongju compacted bentonite using seismic methods. Two sets of compacted bentonite specimens were prepared having dry densities of $1.59g/cm^3$ and $1.75g/cm^3$ with water contents of 10.6% and 8.7%. Free-free resonant column tests were performed to measure constrained and unconstrained compression wave velocities. With the measured wave velocities, Young's modulus ($E_{max}$) and constrained modulus ($M_{max}$), material damping ratio ($D_{min}$), and Poisson's ratio at small strain were determined. As results, this paper evaluates the deformation properties of Gyeongju compacted bentonite and compares them with the results of previous researches.
Keywords
Gyeongju compacted bentonite; Engineered barrier system; Wave velocity; Modulus; Damping ratio; Free-free resonant column test;
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Times Cited By KSCI : 1  (Citation Analysis)
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