## 2 Materials and Methods
### Experimental Procedure: UCS and CCS Tests
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**CCS (Fixed \(\sigma_{\rm diff}\))** & \multicolumn{6}{c}{**Experiment**} \\ \hline Type & Caleschist & Marble & Limestone & Quartzite & Silist Stone & Quartzschist & Mudstone \\ Code & TD12-CS5 & TD1-M4 & TS2-SZ14 & TD20-QZ-2 & TK-B1-1 & TD-23-QMS1 & TK-B2-1 \\ Length (mm) & 61.5 \(\pm\) 0.1 & 62.5 \(\pm\) 0.1 & 60.8 \(\pm\) 0.1 & 62.5 \(\pm\) 0.1 & 65.0 \(\pm\) 0.1 & 62.5 \(\pm\) 0.1 & 63.7 \(\pm\) 0.1 \\ Diameter (mm) & 29.8 \(\pm\) 0.1 & 29.8 \(\pm\) 0.1 & 29.8 \(\pm\) 0.1 & 29.8 \(\pm\) 0.1 & 29.8 \(\pm\) 0.1 & 29.6 \(\pm\) 0.1 & 29.7 \(\pm\) 0.1 \\ Porosity (\%) & 2.42 \(\pm\) 0.03 & 2.15 \(\pm\) 0.09 & 10.48 \(\pm\) 0.24 & 2.57 \(\pm\) 0.03 & 25.10 \(\pm\) 0.05 & 1.71 \(\pm\) 0.29 & 16.60 \(\pm\) 0.15 \\ Permeability (mD) & - & - & - & - & - & - & - \\ Pore Volume (mm\({}^{3}\)) & 1038 \(\pm\) 22 & 937 \(\pm\) 47 & 4444 \(\pm\) 140 & 1120 \(\pm\) 23 & 11370 \(\pm\) 117 & 735 \(\pm\) 132 & 7326 \(\pm\) 127 \\ Matrix density & 2.75 \(\pm\) 0.01 & 2.75 \(\pm\) 0.01 & 2.75 \(\pm\) 0.01 & 2.90 \(\pm\) 0.01 & 2.77 \(\pm\) 0.01 & 2.80 \(\pm\) 0.01 & 2.82 \(\pm\) 0.01 \\ (g/cm\({}^{3}\)) & 2.68 \(\pm\) 0.02 & 2.69 \(\pm\) 0.02 & 2.47 \(\pm\) 0.03 & 2.82 \(\pm\) 0.02 & 2.07 \(\pm\) 0.01 & 2.76 \(\pm\) 0.03 & 2.36 \(\pm\) 0.02 \\ \(\sigma_{\rm diff}\) (MPa\({}^{4}\)) & 45 & 45 & 45 & 45 & 10 & 45 & 10 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Properties of the core samples used in experimental series C: CCS tests (fixed \(\sigma_{\rm diff}\)). \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**CCS (\(\sigma_{1}=\sigma_{2}\))** & \multicolumn{6}{c}{**Experiment**} \\ \hline Type & Caleschist & Marble & Limestone & Quartzite & Silist Stone & Quartzschist & Mudstone & Micaschist \\ Code & TD12-CS5 & TD1-M1 & TS2-SZ14 & TD20-QZ-1 & TK-B1-2 & TD-23- & TK-B2-1 & TD-25-MS-1 \\ Length (mm) & 61.5 \(\pm\) 0.1 & 60.5 \(\pm\) 0.1 & 60.8 \(\pm\) 0.1 & 62.8 \(\pm\) 0.1 & 62.7 \(\pm\) 0.1 & 62.5 \(\pm\) 0.1 & 63.7 \(\pm\) 0.1 & 41.0 \(\pm\) 0.1 \\ Density (mm) & 61.5 \(\pm\) 0.1 & 60.5 \(\pm\) 0.1 & 60.8 \(\pm\) 0.1 & 62.8 \(\pm\) 0.1 & 62.7 \(\pm\) 0.1 & 62.5 \(\pm\) 0.1 & 63.7 \(\pm\) 0.1 & 41.0 \(\pm\) 0.1 \\ Diameter (mm) & 29.8 \(\pm\) 0.1 & 29.8 \(\pm\) 0.1 & 29.8 \(\pm\) 0.1 & 29.8 \(\pm\) 0.1 & 29.8 \(\pm\) 0.1 & 29.6 \(\pm\) 0.1 & 29.7 \(\pm\) 0.1 & 29.7 \(\pm\) 0.1 \\ Porosity (\%) & 2.42 \(\pm\) 0.03 & 2.67 \(\pm\) 0.06 & 10.48 \(\pm\) 0.24 & 2.77 \(\pm\) 0.16 & 22.55 \(\pm\) 0.01 & 1.71 \(\pm\) 0.29 & 16.60 \(\pm\) 0.15 & 8.52 \(\pm\) 0.37 \\ Permeability (mD) & - & - & - & - & - & - & - \\ Pore Volume (mm\({}^{3}\)) & 1038 \(\pm\) 22 & 1127 \(\pm\) 35 & 4444 \(\pm\) 140 & 1213 \(\pm\) 81 & 9861 \(\pm\) 87 & 735 \(\pm\) 132 & 7326 \(\pm\) 127 & 2420 \(\pm\) 128 \\ Matrix density & 2.75 \(\pm\) 0.01 & 2.74 \(\pm\) 0.01 & 2.75 \(\pm\) 0.01 & 2.89 \(\pm\) 0.01 & 2.78 \(\pm\) 0.01 & 2.80 \(\pm\) 0.01 & 2.82 \(\pm\) 0.01 & 2.92 \(\pm\) 0.01 \\ (g/cm\({}^{3}\)) & & - & - & - & - & - & - & - \\ Bulk density (g/cm\({}^{3}\)) & 2.68 \(\pm\) 0.02 & 2.69 \(\pm\) 0.02 & 2.47 \(\pm\) 0.03 & 2.81 \(\pm\) 0.02 & 2.15 \(\pm\) 0.01 & 2.76 \(\pm\) 0.03 & 2.36 \(\pm\) 0.02 & 2.67 \(\pm\) 0.02 \\ \(\sigma_{\rm diff}\) (MPa\({}^{4}\)) & 45 & 45 & 45 & 45 & 10 & 45 & 10 \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Properties of the core samples used in experimental series B: CCS tests (\(\sigma_{1}=\sigma_{2}\)).