Anisotropy of Pressure Generated by Water Absorption of Deformation-Constrained Granular Bentonite Specimens

Yuta Ichikawa*, Hideo Komine, Shigeru Goto

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Bentonite is being considered for use as a buffer material in the geological disposal of high-level radioactive waste, and studies of its swelling pressure have been conducted. However, most of the previous studies have measured only the vertical pressure and not the lateral pressure. In this study, the vertical and lateral pressures generated by water absorption in a granular bentonite specimen under deformation constraints were measured. The results showed that the lateral pressure converged to a value slightly greater than the vertical pressure, with a difference of about 200 kPa for a dry density of 1.6 Mg/m3 and about 100 kPa for a dry density of 1.4 Mg/m3. The larger specimen volume required more time to converge, but if the dry density were equal, there was no significant difference in the convergence value of the pressure. This suggests that the use of specimens with small dimensions is effective in obtaining pressure properties of granular bentonite in a short time.

Original languageEnglish
Title of host publicationGeo-Sustainnovation for Resilient Society - Select Proceedings of CREST 2023
EditorsHemanta Hazarika, Stuart Kenneth Haigh, Babloo Chaudhary, Masanori Murai, Suman Manandhar
PublisherSpringer Science and Business Media Deutschland GmbH
Pages257-267
Number of pages11
ISBN (Print)9789819992188
DOIs
Publication statusPublished - 2024
Event2nd International Conference on Construction Resources for Environmentally Sustainable Technologies, CREST 2023 - Fukuoka, Japan
Duration: 2023 Nov 202023 Nov 22

Publication series

NameLecture Notes in Civil Engineering
Volume446
ISSN (Print)2366-2557
ISSN (Electronic)2366-2565

Conference

Conference2nd International Conference on Construction Resources for Environmentally Sustainable Technologies, CREST 2023
Country/TerritoryJapan
CityFukuoka
Period23/11/2023/11/22

Keywords

  • Anisotropy
  • Bentonite
  • Swelling pressure

ASJC Scopus subject areas

  • Civil and Structural Engineering

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