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Cracking Behaviors and Acoustic Emission Characteristics in Brittle Failure of Flawed Sandstone: A True Triaxial Experiment Investigation
Abstract True triaxial experiment with a synchronous acoustic emission (AE) monitoring system is a popular measure for the assessment of strength and cracking behaviors of brittle flawed rocks under anisotropic stress circumstances. This measure was employed to investigate the laboratory-scale brittle failure of flawed sandstone containing two different en echelon flaw configurations. Quantitative interpretations and comparisons of acousto-mechanical properties and cracking behaviors in intact and flawed sandstone have become available. Observations first revealed that en echelon flaws considerably weakened rock strength and deformability, and strongly affected the damage and failure processes. Second, intact specimen showed a quasi-2D spallation failure, while the failure of flawed specimens was dominated by the induced cracks initiated from en echelon flaws. Third, the two fundamental failure types of rock bridge including tensile-dominated failure and shear-dominated failure were registered. Whatever the failure type, micro-shear failure mechanism co-existed with micro-tensile failure mechanism. Moreover, AE amplitude distributions at the stable and unstable cracking phases follow a power law. The current findings provide insights into the brittle failure mechanisms of flawed rocks and have significant implications at scales relevant to seismicity and engineering applications.
Highlights True triaxial experiment investigations of brittle failure in flawed sandstoneQuantitative interpretations and comparisons of acousto-mechanical properties and cracking behaviors in intact and flawed sandstoneQuasi-2D spallation failure occurs in intact specimen, while the shear cracks initiated from the flaw tips dominate the failure in flawed specimensCo-existences of micro-shear failure mechanism with micro-tensile failure mechanism at the triggering processes of rock fractureAE amplitude distributions at the stable and unstable cracking stages follow a power law
Cracking Behaviors and Acoustic Emission Characteristics in Brittle Failure of Flawed Sandstone: A True Triaxial Experiment Investigation
Abstract True triaxial experiment with a synchronous acoustic emission (AE) monitoring system is a popular measure for the assessment of strength and cracking behaviors of brittle flawed rocks under anisotropic stress circumstances. This measure was employed to investigate the laboratory-scale brittle failure of flawed sandstone containing two different en echelon flaw configurations. Quantitative interpretations and comparisons of acousto-mechanical properties and cracking behaviors in intact and flawed sandstone have become available. Observations first revealed that en echelon flaws considerably weakened rock strength and deformability, and strongly affected the damage and failure processes. Second, intact specimen showed a quasi-2D spallation failure, while the failure of flawed specimens was dominated by the induced cracks initiated from en echelon flaws. Third, the two fundamental failure types of rock bridge including tensile-dominated failure and shear-dominated failure were registered. Whatever the failure type, micro-shear failure mechanism co-existed with micro-tensile failure mechanism. Moreover, AE amplitude distributions at the stable and unstable cracking phases follow a power law. The current findings provide insights into the brittle failure mechanisms of flawed rocks and have significant implications at scales relevant to seismicity and engineering applications.
Highlights True triaxial experiment investigations of brittle failure in flawed sandstoneQuantitative interpretations and comparisons of acousto-mechanical properties and cracking behaviors in intact and flawed sandstoneQuasi-2D spallation failure occurs in intact specimen, while the shear cracks initiated from the flaw tips dominate the failure in flawed specimensCo-existences of micro-shear failure mechanism with micro-tensile failure mechanism at the triggering processes of rock fractureAE amplitude distributions at the stable and unstable cracking stages follow a power law
Cracking Behaviors and Acoustic Emission Characteristics in Brittle Failure of Flawed Sandstone: A True Triaxial Experiment Investigation
Zhang, Jian-Zhi (author) / Zhou, Xiao-Ping (author) / Du, Yuan-Hui (author)
2022
Article (Journal)
Electronic Resource
English
BKL:
38.58
Geomechanik
/
56.20
Ingenieurgeologie, Bodenmechanik
/
38.58$jGeomechanik
/
56.20$jIngenieurgeologie$jBodenmechanik
RVK:
ELIB41
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