Structural healing and decay of sedimentary soft rock in triaxial slide-hold-slide process and its modelling

Mamoru Kikumoto, Nguyen P.Q. Vu, Masato Ohno, Kiyoshi Kishida, Hideaki Yasuhara, Derek Elsworth

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

Abstract

In order to investigate the thermo-hydro-mechanical behavior of rock masses over long periods of time, slide-hold-slide triaxial tests have been conducted on a sedimentary soft rock under several patterns of effective confining stress conditions and under several thermal conditions. The strength recovery was observed in the re-sliding process after the holding period especially when the confining pressure is relatively low. An elastoplastic model incorporating the healing and decay of the rock structure is proposed to describe the strength recovery in the re-sliding process. The proposed model is based on a critical state soil model and is formulated according to the following concept. Firstly, the effect of density on the stiffness and strength is considered by introducing the modified concept of the subloading surface. Secondly, as the healing of the stiffness and strength occurs together with the increase of the rock structure with the increase of the holding period, the structural healing is modeled by the upper movements of the normally consolidation line and the critical state line in the plane of mean effective stress and void ratio. Thirdly, the structure decreases with the development of plastic strain and this is modeled by the lower movement of the two state lines. Triaxial slide-hold-slide tests are simulated by the proposed model and applicability of the model is discussed.

Original languageEnglish (US)
Title of host publicationISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014
Editors Kaneko, Kodama, Shimizu
PublisherInternational Society for Rock Mechanics
Pages536-545
Number of pages10
ISBN (Electronic)9784907430030
StatePublished - Jan 1 2014
Event8th Asian Rock Mechanics Symposium, ARMS 2014 - Sapporo, Japan
Duration: Oct 14 2014Oct 16 2014

Publication series

NameISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014

Other

Other8th Asian Rock Mechanics Symposium, ARMS 2014
CountryJapan
CitySapporo
Period10/14/1410/16/14

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Kikumoto, M., Vu, N. P. Q., Ohno, M., Kishida, K., Yasuhara, H., & Elsworth, D. (2014). Structural healing and decay of sedimentary soft rock in triaxial slide-hold-slide process and its modelling. In Kaneko, Kodama, & Shimizu (Eds.), ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014 (pp. 536-545). (ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014). International Society for Rock Mechanics.