the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Crack damage stress in fully saturated, permeable rocks: A new detection procedure
Abstract. To detect the crack damage stress also known as onset of dilatancy in fully saturated rocks, we propose a new procedure which combines an innovative measurement technique using pore pressure diffusion with the well known technique of finding the pore pressure maximum. A precise determination of the crack damage stress is required to establish parameter dependencies and ultimately to develop a constitutive equation for the crack damage stress, which is of significant interest e.g. for the long-term safety analysis of repositories for radioactive waste. The new technique monitors the true axial strain as indicator for the crack damage stress during a pore pressure diffusion test. In addition to the crack damage stress, this new true axial strain method simultaneously yields pore pressure diffusion coefficients, thereby maximising the information gain. The true axial strain method was developed based on a multi-cycle, long-term experiment of one sample of Passwang Marl, but it can be applied to other types of rocks, which is demonstrated on a Bunter Sandstone.
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CC1: 'Comment on egusphere-2024-1074', Giacomo Medici, 20 May 2024
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General comments
Good research in the field of rock mechanics with an angle on fluid flow that attempts to a novel method. Some detail is missing, see the specific comments below to fix the issues
Specific comments
Lines 11-12. “Understanding the hydro-mechanical behaviour of rocks...construction”. Statement not backed up by references. Please, insert the following review on energy extraction and nuclear waste repositories:
- Medici G., Ling F., Shang J. 2023. Review of discrete fracture network characterization for geothermal energy extraction. Frontiers in Earth Science, 11, doi.org/10.3389/feart.2023.1328397
- David, C., & Le Ravalec-Dupin, M. (2007). Rock physics and geomechanics in the study of reservoirs and repositories. Geological Society, London, Special Publications, 284(1), 1-14.
Lines 11-12. The hydro-mechanical behaviour of rocks is also relevant in geothermal energy. Please, specify this point (see reference above).
Lines 12-18. Several other statements are not back up by references.
Line 55. Clearly disclose the aim of your research and the 3 to 4 specific objectives by using numbers (e.g., i, ii and iii) at the end of your introduction.
Lines 57-onwards. Provide detail on the sedimentological characteristics of the two samples. For example the sample of the Bunter Sandstone is fluvial or aeolian? Age?
Lines 57-onwards. Have you got information on the petrophysical (e.g., porosity, and hydraulic conductivity) and mineralogical components of those samples from previous studies or theses? You mention the concept of permeability in your manuscript.
Lines 359-366. Expand the conclusions which are too short.
Figures and tables
Figures 1, 3, 4, 5. Time units unclear and undefined. They also change (h and d) in the figures. Please, check if you have provided the relevant information in the main body of your manuscript.
Figures 7-9. Make the figure larger, there is room for doing that.
Figure 10. Make the figure larger and provide more detail in the caption (“Bilinear fits of....”).
Citation: https://doi.org/10.5194/egusphere-2024-1074-CC1
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