Fully coupled analysis of interaction between the borehole and pre-existing fractures

Gomar, Mostafa; Goodarznia, Iraj; Shadizadeh, Seyed Reza

doi:10.1016/j.ijrmms.2016.07.029

Cited by 10 publications

(1 citation statement)

References 38 publications

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“…The sample diameter and height are 50 and 100 mm, respectively. The influence of persistent fractures on coal failure behavior has been thoroughly researched [69][70][71]. This study mainly focuses on the influence of nonpersistent fractures, which also play an important role in dominating progressive failure process of coal.…”

Section: Experimental Procedures 21 Sample Preparationmentioning

confidence: 99%

Computed Tomography Observation and Image-Based Simulation of Fracture Propagation in Compressed Coal

Wang

Sun²,

Shui³

2022

Energies

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In this study, the fracture propagation characteristics and associated mechanisms of coal are investigated by using computed tomography (CT) observation and image-based simulation. The spatial distribution and the structural morphology of original fractures provide significant influences on the failure behavior of fractured coal. The fractures with small dip angles and large openings result in more-obvious fracture closure and stable propagation stages, while failure pattern is more sensitive to those with large dip angles. The coal tends to experience brittle failure, which transits from a splitting to mixed-splitting faulting mode because of the difference in original fracture distribution. The final failure fracture network originates mainly from the propagation of original fractures, driven by localized tensile stress. Fracture interaction and mineral influence tend to increase the complexity in the failure fracture network. Moreover, image-based numerical models are established on the basis of CT reconstruction, where the spatial distribution and the structural morphology of original fractures are properly considered. Numerical modeling reproduces similar stress–strain responses and failure fracture networks to that observed in the experiment. The predicted distribution of tensile stress shows a similar evolution trend to the failure fracture network, implying that the fracture propagation of coal is dominated by tensile failure. Shear cracks emerge mainly after the large fracture running through the coal sample has been formed.

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Section: Experimental Procedures 21 Sample Preparationmentioning

confidence: 99%