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Modelling the non-standard in-situ loading paths in 3D stress space through laboratory triaxial experiments
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SYSNO ASEP 0460444 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Modelling the non-standard in-situ loading paths in 3D stress space through laboratory triaxial experiments Author(s) Janeček, Ivan (UGN-S) RID
Mishra, A. Deepak (UGN-S)Number of authors 2 Source Title Tampere, Finland Symposium Proceedings. - Tampere : The Finish National Group of ISRM and Finish Association of Civil Engineers RIL, 2016 / Johansson E. ; Raasakka V. - ISSN 0356-9403 - ISBN 978-951-758-606-1 Pages s. 482-491 Number of pages 10 s. Publication form Online - E Action International Symposium on In-Situ Rock Stress - RS2016 /7./ Event date 10.05.2016 - 12.05.2016 VEvent location Tampere Country FI - Finland Event type WRD Language eng - English Country FI - Finland Keywords triaxial test ; in situ stress ; mechanical properties of rocks Subject RIV DH - Mining, incl. Coal Mining R&D Projects LO1406 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) ED2.1.00/03.0082 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UGN-S - RVO:68145535 Annotation Majority of experimental strength and deformational characteristics of rocks are obtained from uniaxial tests,
mainly from compression tests, or through the particular triaxial experiments commonly known as Conventional
Triaxial Compression (CTC). The procedure of CTC test usually consists of initial compression up to isotropic
pressure imitating e.g. a component of geostatic stress at a given depth, and subsequent application of
additional axial loading, which can be a model of anisotropic stress conditions or differential stresses originating
from inhomogeneities or movement of surrounding rock masses. This CTC test, however, cannot always portray
the in-situ conditions. For example such axial compression does not reflect the real stress paths during the rock
burst. More appropriate experimental model for the phenomenon is axial stress reduction inducing axial
extension in test named Reduced Triaxial Extension (RTE). Stress paths representing axial extension are also
important in case of core disking. In addition to CTC and RTE paths, the next complementary paths can be
considered: Conventional Triaxial Extension (CTE) or Reduced Triaxial Compression (RTC) using increasing or
decreasing the lateral stress respectively. This work discusses the experimental methodology and technical
solutions prepared for realization of several special loading paths in laboratory triaxial experiment.
Workplace Institute of Geonics Contact Lucie Gurková, lucie.gurkova@ugn.cas.cz, Tel.: 596 979 354 Year of Publishing 2017 Electronic address https://dl.dropboxusercontent.com/u/27909263/RS2016%20Tampere%20Proceedings.pdf
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