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http://dx.doi.org/10.7474/TUS.2020.30.1.087

Application of Fracture Toughness for Scaled Model Test  

Kim, Jong-Gwan (Boleo Department, Korea Resources Corporation)
Publication Information
Tunnel and Underground Space / v.30, no.1, 2020 , pp. 87-97 More about this Journal
Abstract
Fracture toughness of rock is a constant that can indicate the initiation and propagation of cracks due to blasting, excavation, etc. Scaled model tests have been applied to the behavior of tunnels and the stability of limestone mines. Through the scaled model, damaged zone evaluation due to blasting is also carried out, and the scale factor is not applied to the failure-related factors. In this study, DCT (diametral compression test) and finite element method ATENA2D numerical analysis results were compared to determine whether the scale factor could be applied to the fracture toughness of rock. The theoretical values of the scale factor applied to the fracture toughness of the rock and the DCT test results and the numerical results are 0.21~0.46, 0.40, and 0.99MPa ${\sqrt{m}}$ respectively, so these three values should be considered when determining scale factor. It is necessary to derive a suitable scale factor in consideration of the length, time, and mass to which the scale factor is applied, as well as the values of the scale factor of major design factors such as uniaxial compressive strength and density.
Keywords
Fracture toughness; Scaled model test; DCT; Cement mortar; Finite element method;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
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