EGU22-3272
https://doi.org/10.5194/egusphere-egu22-3272
EGU General Assembly 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

The stress memory in rocks: insight from the deformation rate analysis (DRA) and acoustic emission (AE)

Zulfiqar Ali1, Murat Karakus1, Giang D. Nguyen1, and Khalid Amrouch2,3
Zulfiqar Ali et al.
  • 1School of Civil,Environmental and Mining Engineering, The University of Adelaide, Australia (zulfiqar.ali@adelaide.edu.au)
  • 2Australian School of Petroleum and Energy, The University of Adelaide, SA 5000
  • 3Mohammed VI Polytechnic University, Geology & Sustainable Mining, Benguerir 43150, Morocco

Deformation rate analysis (DRA) and Acoustic Emission (AE) are popular methods of in-situ stress measurements from oriented cored rocks which take advantage of the rock stress memory also known as the Kaiser effect. These methods rely on the accurate measurement of a point of inflection in the characteristic DRA and AE curves, however, due to the complex geological stress history in rocks, locating point of inflection can be problematic. In order to better understand the stress memory experiments were performed on a combination of six different types of soft, and hard crystalline rocks including concrete with no stress history. The effect of loading modes, strain rates, and time delay were studied on preloaded rock specimens to investigate their influence on the stress memory. A fading effect was observed when the number of the cycles in the test were increased which led to the development of a new method of quantifying the preloads. Results show that the type of loading and the loading rate has little to no influence on the Kaiser effect, however, under faster loading rates the Kaiser effect is more distinct. Likewise, no time dependency was observed for time delays up to seven months.

How to cite: Ali, Z., Karakus, M., Nguyen, G. D., and Amrouch, K.: The stress memory in rocks: insight from the deformation rate analysis (DRA) and acoustic emission (AE), EGU General Assembly 2022, Vienna, Austria, 23–27 May 2022, EGU22-3272, https://doi.org/10.5194/egusphere-egu22-3272, 2022.

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