Akademik Veri Yönetim Sistemi
MECHANICS OF TIME-DEPENDENT MATERIALS, cilt.28, ss.1-17, 2024 (SCI-Expanded)
Mode I fracture toughness (Kıc) is a critical parameter in rock mechanics that is essential for
understanding how rocks behave under tensile loading and crucial for applications ranging
from safety assessments to structural design in geotechnical engineering. This study comprehensively
investigates the influence of various environmental conditions (dry, saturated,
frozen, thermal shock and thermal aging) on the physico-mechanical properties and Kıc of
rocks. The primary novelty of this study lies in its comprehensive modeling approach under
diverse environmental conditions, providing a nuanced understanding of factors influencing
rock fracture toughness. By extending analysis to less-studied conditions such as freezing
and thermal shock cycles, the study enhances the predictive capacity of fracture toughness
models in practical geotechnical applications. Physico-mechanical properties, including uniaxial
compressive strength, point load strength, Brazilian tensile strength (BT), Schmidt
hardness, and ultrasonic wave velocity were evaluated across different environmental scenarios.
Simple and linear multiple regression models were developed using these properties
to predict Kıc. Notably, BT emerged as a significant predictor in the simple regression analyzes.
Ten linear multiple regression models were formulated using SPSS 20, combining
mechanical tests (UCS, BT, PL) with non-destructive testing methods (Vp, Vs, SH), demonstrating
robust predictive capabilities with R2 values exceeding 0.95. Performance metrics
(mean absolute error, mean absolute percentage error, root mean square error) were used to
verify the accuracy of the model.