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- W2318460950 abstract "To develop the core-based methods for determining fracture toughness of rock under confining pressure, the stress intensity factor associated with confining pressure was calculated for CB (Chevron Bend), SR (Short Rod) and C-RCT (Chevron-notched Round Compact Tension) specimens by using a three-dimensional boundary element method.Considering the load F0 and the load-line displacement uF0required to open the tip of a created fracture under a given constant confining pressure, it was shown that, if we take the load increase ΔF (=F-F0) in place of load and take the displacement increase ΔuF (=uF-uF0) after the tip of the fracture is open in place of displacement, the stress intensity factor and the load-displacement diagram under confining pressure can be converted to those under atmospheric pressure.A method for determining K-resistance (level II fracture toughness in the ISRM methods) curve under confining pressure was proposed based upon the consideration decribed above. In this method, crack length is determined first by using the slope of a linear portion in F-uF diagram during unloading to calculate F0 and, then ΔF and d ΔuF are calculated for unloading points to construct a AF d uF diagram, from which the non-linearity correction factor p is determined. Then the K-resistance is evaluated by using the mean p between two adjacent cycles and the stress intensity factor at the unloading point similarly to the case of under atmospheric pressure." @default.
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- W2318460950 date "1995-01-01" @default.
- W2318460950 modified "2023-09-22" @default.
- W2318460950 title "Analysis of Stress Intensity Factor of Core-based Fracture Toughness Test Specimens of Rock under Confining Pressure and Evaluation of K-resistance Curve." @default.
- W2318460950 doi "https://doi.org/10.2473/shigentosozai.111.749" @default.
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