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Predicting geomechanical, abrasivity, and drillability properties in some igneous rocks using fabric features and petrographic indexes

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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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Data availability

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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Correspondence to Mojtaba Heidari.

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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

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