Abstract
It is quite often that rocks contain intersecting cracks. Therefore, crack behavior cannot be completely studied by only considering several isolated, single flaws. To investigate the crack behavior of rock or rock-like material containing intersecting flaws under uniaxial loading, numerical simulations were carried out using parallel bonded-particle models containing two intersecting flaws with different inclination angles (varying β) and different intersection angles (varying αα). The crack propagation processes are analyzed and two typical patterns of linkage are observed between two intersecting flaws: (1) One-tip-linkage that contains three subtypes: Coalescence position near the tip; coalescence position at the flaw, but far away from the tip; coalescence position outside the flaw at a certain distance from the tip; and (2) two-tip-linkage with two subtypes: Straight linkage and arc linkage. The geometries of flaws influence the coalescence type. Moreover, the effects of intersection angle α and inclination angle β on the peak stress, the stress of crack initiation, and the stress of crack coalescence are also investigated in detail.
Highlights
Numerous discontinuities on different scales occur in rocks and rock masses, such as flaws, joints, cracks, and faults, which are induced during the formation of rock masses and successive tectonic processes
Lee and Jeon [30] used three materials (PMM, Diastone and Hwangdeung granite) to study the coalescence of a horizontal flaw with an underneath lying, inclined flaw. They stated that the geometry of a double-flaw can improve the understanding of crack propagation and coalescence because echelon type of cracks can be initiated by fracture planes that are not parallel to each other
Verification, the mechanical behavior of specimens containing two intersecting flaws and Following we thissimulated verification, we simulated the mechanical behavior of specimens containing two the forthcoming sub-sections report the results of those simulations
Summary
Numerous discontinuities on different scales occur in rocks and rock masses, such as flaws, joints, cracks, and faults, which are induced during the formation of rock masses and successive tectonic processes. Lee and Jeon [30] used three materials (PMM, Diastone and Hwangdeung granite) to study the coalescence of a horizontal flaw with an underneath lying, inclined flaw They stated that the geometry of a double-flaw can improve the understanding of crack propagation and coalescence because echelon type of cracks can be initiated by fracture planes that are not parallel to each other. Their results showed that the stress distribution in the bridge area of the non-parallel flaws is more complicated than that of the parallel flaws This difference affects the crack initiation stress as well as the coalescence pattern. Numerical simulation results are shown in respect to peak strength, crack initial stress, crack coalescence stress, and coalescence patterns of rock-like material with two intersecting flaws under uniaxial compression using a bonded-particle model (BPM)
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