Proceedings of the Rocscience International Conference 2025 (RIC 2025)

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In Situ Stress Determination, 3D Rock Properties and Numerical Modelling

Authors
Phil Dight1, *
1Professor of Geotechnical Engineering, Australian Centre for Geomechanics, The University of Western Australia, Crawley, WA, Australia, 6009
*Corresponding author. Email: phil.dight@uwa.edu.au
Corresponding Author
Phil Dight
Available Online 7 December 2025.
DOI
10.2991/978-94-6463-900-1_7How to use a DOI?
Keywords
In situ stress; principal component theory; 3DRock; 3D compliance matrix
Abstract

In situ stress determination is possible using deformation rate analysis (DRA) without resorting to elastic theory and its constraints/assumptions. The approach is based on recovering the inelastic strain between two cycles of loading on cylindrical samples of rock. The test technique makes use of strain measurements in the axial and lateral direction conducted on sub-samples recovered from oriented diamond drill core. The measurement of the normal stress on each of six uniquely oriented samples, provides a direct measurement of the in situ stress which can then be resolved in three dimensions using principal component theory (commonly called eigen analysis). The stress so determined can be evaluated at a 95% precision based on the number of samples tested (typically > 18). A consequence of this approach is that the density, modulus, Poisson’s ratio, P-wave and S-wave velocity and dynamic elastic properties can also be determined using the same principal component theory. This results in many of the rock properties being determined in three dimensions (3DRock) along with a 3D compliance matrix. Using the power of RS3®, numerical modelling of openings can be undertaken using the recovered in situ stress, the 3D rock properties and 3D compliance matrix. An example is provided of RS3® in identifying safety hazard awareness ahead of time.

Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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Volume Title
Proceedings of the Rocscience International Conference 2025 (RIC 2025)
Series
Atlantis Highlights in Engineering
Publication Date
7 December 2025
ISBN
978-94-6463-900-1
ISSN
2589-4943
DOI
10.2991/978-94-6463-900-1_7How to use a DOI?
Copyright
© 2025 The Author(s)
Open Access
Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

Cite this article

risenwbib
TY  - CONF
AU  - Phil Dight
PY  - 2025
DA  - 2025/12/07
TI  - In Situ Stress Determination, 3D Rock Properties and Numerical Modelling
BT  - Proceedings of the Rocscience International Conference 2025 (RIC 2025)
PB  - Atlantis Press
SP  - 72
EP  - 84
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-900-1_7
DO  - 10.2991/978-94-6463-900-1_7
ID  - Dight2025
ER  -