1 Introduction
2 Study Areas
2.1 Geographical Description of the Study Areas
2.2 Geology of the Study Areas
3 Samples Preparation and Characterization
3.1 Sample Preparation
3.2 Sample Characterization
4 Test results and analysis
4.1 Thin section, mineral composition, and grain size distribution
Rock type | Minerals | Proportion (%) | Grain size (mm) |
---|---|---|---|
Gabbro | Clinopyroxene | 47 | 2.0–5.0 |
Plagioclase | 43 | 2.0–4.0 | |
Hornblende | 5 | 0.5–1.0 | |
Opaque minerals | 2 | 0.5–1.0 | |
Other minerals | 3 | 0.5–1.0 | |
Granite | K-feldspars | 50 | 0.5–2.0 |
Quartz | 30 | 0.1–1.0 | |
Amphibole | 10 | 0.1–0.5 | |
Opaque minerals | 5 | 0.5–1.5 | |
Other minerals | 5 | 0.5–1.0 |
4.2 Chemical composition of rocks
Parameter | Number of data | Minimum value | Maximum value | Range | Mean | Standard deviation |
---|---|---|---|---|---|---|
Gabbro
| ||||||
Na2O (%) | 15 | 2.43 | 3.45 | 1.02 | 2.85 | 0.26 |
MgO (%) | 15 | 5.01 | 8.56 | 3.55 | 6.83 | 1.08 |
Al2O3 (%) | 15 | 15.04 | 19.59 | 4.55 | 17.46 | 1.25 |
SiO2 (%) | 15 | 46.40 | 48.09 | 1.69 | 47.51 | 0.45 |
P2O5 (%) | 15 | 0.02 | 0.06 | 0.04 | 0.04 | 0.01 |
K2O (%) | 15 | 0.21 | 0.37 | 0.16 | 0.26 | 0.04 |
CaO (%) | 15 | 11.71 | 13.2 | 1.49 | 12.53 | 0.47 |
TiO2 (%) | 15 | 0.47 | 1.02 | 0.55 | 0.63 | 0.15 |
MnO (%) | 15 | 0.09 | 0.14 | 0.05 | 0.12 | 0.01 |
FeO (%) | 15 | 4.80 | 7.22 | 2.42 | 5.97 | 0.69 |
Granite
| ||||||
Na2O (%) | 10 | 4.63 | 5.89 | 1.26 | 5.00 | 0.36 |
MgO (%) | 10 | 0.09 | 0.17 | 0.08 | 0.12 | 0.02 |
Al2O3 (%) | 10 | 10.92 | 13.6 | 2.68 | 11.87 | 0.72 |
SiO2 (%) | 10 | 63.31 | 69.61 | 6.30 | 67.87 | 1.90 |
P2O5 (%) | 10 | 0.03 | 0.06 | 0.03 | 0.04 | 0.01 |
K2O (%) | 10 | 3.90 | 4.80 | 0.90 | 4.31 | 0.24 |
CaO (%) | 10 | 0.27 | 0.65 | 0.38 | 0.47 | 0.13 |
TiO2 (%) | 10 | 0.27 | 0.54 | 0.27 | 0.39 | 0.09 |
MnO (%) | 10 | 0.09 | 0.12 | 0.03 | 0.11 | 0.01 |
FeO (%) | 10 | 3.70 | 5.04 | 1.34 | 4.41 | 0.44 |
4.3 Physical and mechanical properties
Parameter | Number of data | Minimum value | Maximum value | Mean | Standard deviation | Coefficient of variation (COV) |
---|---|---|---|---|---|---|
Gabbro
| ||||||
\({w}_{c}\) (%) | 15 | 0.01 | 0.04 | 0.02 | 0.01 | 50.00 |
n (%) | 15 | 0.13 | 0.48 | 0.29 | 0.10 | 34.48 |
BTS(MPa) | 15 | 6.8 | 12.6 | 9.88 | 1.78 | 18.02 |
UCS (MPa) | 5 | 294 | 303 | 298.8 | 4.27 | 1.43 |
E (GPa) | 5 | 103 | 108 | 105.2 | 1.92 | 1.83 |
v
| 5 | 0.25 | 0.29 | 0.28 | 0.02 | 7.14 |
Granite
| ||||||
\({w}_{c}\) (%) | 10 | 0.02 | 0.12 | 0.05 | 0.04 | 80.00 |
n (%) | 10 | 0.29 | 1.64 | 0.73 | 0.43 | 58.90 |
BTS(MPa) | 10 | 7.1 | 12.7 | 10.41 | 1.96 | 18.83 |
UCS (MPa) | 6 | 228 | 284 | 253 | 23.24 | 9.19 |
E (GPa) | 6 | 64 | 71 | 66.67 | 3.01 | 4.51 |
v
| 6 | 0.27 | 0.29 | 0.28 | 0.01 | 3.57 |