Abstract
In this study, we have established and demonstrated the relationships between petrographic and fabric features of igneous rocks and their engineering properties experimentally. To meet this purpose, we have examined several igneous rock specimens and have investigated their engineering properties, including their drillability (drilling rate index (DRI)), abrasivity (Cerchar abrasivity index (CAI)), mechanical features (uniaxial compressive strength (UCS), point load strength index (IS50), Brazilian test strength (BTS)), and their physical properties (dry density, porosity (N), and wave velocity (VP)). Then, we have investigated their petrographic features, including shape descriptors, size descriptors, rock fabric features, and mineralogical indexes. We tested 16 types of igneous rocks from 8 various locations in the Gelas tunnel route in Naghadeh City, west Azerbaijan, Iran. The Pearson correlation coefficient indicated a low drillability potential of fine-grained rocks compared to that of coarse-grained rocks. UCS displayed the best Pearson correlation with heterogeneity (H) and texture coefficient (TC) (R = − 0.88 and R = 0.86, respectively). Although the results obtained from multilinear regression (MLR) and multilinear log-linear regression (MLLR) models proved the efficiency of such models in predicting CAI, TC, H, index of interlocking (g), and Feldspathic index (IF). Their determination coefficient (R2) was 0.84 and R2 = 0.87, respectively. Nevertheless, in comparison, the artificial neural network (ANN) analysis is apparently more efficient than both MLR and MLLR (R2 = 0.90). The results revealed rock fabric features have a higher capability in identifying the engineering properties of igneous rocks than their mineralogical composition.
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Some or all data generated or used during the study are available from the corresponding author by request, including laboratory data results.
Abbreviations
- DRI:
-
Drilling rate index
- CAI:
-
Cerchar abrasivity index
- UCS:
-
Uniaxial compressive strength
- I S50 :
-
Point load strength index
- BTS:
-
Brazilian test strength
- H :
-
Heterogeneity index
- TC:
-
Texture coefficient
- g :
-
Index of interlocking
- t :
-
Index of grain size homogeneity
- AR:
-
Aspect ratio
- AW:
-
Area weighting of grains
- AF:
-
Angle factor
- N 0 :
-
Numbers of grains with AR < 2
- N 1 :
-
Numbers of grains with AR > 2
- FF0 :
-
Arithmetic mean of discriminated FF
- FF:
-
Form factor
- AR1 :
-
Arithmetic mean of discriminated AR
- AF1 :
-
Angle factor/5
- N :
-
Porosity
- IS:
-
Saturation index
- IF:
-
Feldspathic index
- IC:
-
Coloration index
- S J :
-
Sievers’ J-miniature
- S 20 :
-
Brittleness tests
- MLR:
-
Multilinear regression
- MLLR:
-
Multilinear log-linear regression
- ROC:
-
Receiver operating characteristic
- Lpi :
-
Grain perimeter that contacts grain
- Ai:
-
Area neighboring grains
- A avg :
-
Average area of the grains
- A i :
-
Area of individual grain
- r i :
-
Mean grain size
- Qtz%:
-
Quartz percent
- Afs%:
-
Alkali-feldspars percent
- Pl%:
-
Plagioclase percent
- Ra:
-
Average grain size of different constituent minerals
- VP:
-
P-wave velocity
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Acknowledgements
Part of this research was funded by a grant from the Vice President of Research Affairs of Bu-Ali Sina University to M. Heidari. An original draft of the manuscript benefited from rendered editorial correction by H. Mohseni (Bu-Ali Sina University, Iran) and N. Mohseni (University of Lund, Sweden). We would also like to thank the anonymous reviewers for their critical reviews and constructive comments.
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Karrari, S.S., Heidari, M., Hamidi, J.K. et al. Predicting geomechanical, abrasivity, and drillability properties in some igneous rocks using fabric features and petrographic indexes. Bull Eng Geol Environ 82, 124 (2023). https://doi.org/10.1007/s10064-023-03144-0
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DOI: https://doi.org/10.1007/s10064-023-03144-0