Deformation Behaviour, Crack Initiation and Crack Damage of Weathered Composite Sandstone-Shale by Using the Ultrasonic Wave and the Acoustic Emission Under Uniaxial Compressive Stress

Abbas, Hasan Ali; Mohamed, Zainab; Kudus, Sakhiah Abdul

doi:10.2139/ssrn.4290221

Cited by 1 publication

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“…Because AE is extremely sensible to the generation and propagation of fractures in materials and structures, AE technology finds extensive applications in areas such as material damage detection. Abbas et al [14] used AE and ultrasonic pulses to analyze the progressive failure process of composite specimens (sandstoneshale-sandstone) under uniaxial stress, providing guidance for evaluating the deformation behavior of rock masses with different lithologies between layers. Zhang et al [15] monitored coal specimens, concrete specimens, and concreteconfined coal specimens in uniaxial compression trials to investigate the evolution of AE energy releasing and the position of AE events.…”

Section: Introductionmentioning

confidence: 99%

Experiment Study on the Mechanical Behavior and Acoustic Emission Response of Thick and Hard Sandstone Roof in Xinjiang Mining Area

Qin,

Chang,

Xia

2024

Advances in Civil Engineering

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One of the primary threats to coal mine safety production is the sudden extensive fracturing and collapse of thick and hard roof strata. A range of uniaxial compression experiments with acoustic emission (AE) monitoring was performed for studying the mechanical properties and crack evolution of thick and hard roof sandstone specimens. AE temporal response analysis revealed that the damage process of thick and hard roof sandstone specimens exhibited distinct stages. Additionally, AE event localization indicated that microcracks within the thick and hard roof sandstone specimens propagated from the ends to the middle of the specimens during the loading process, eventually leading to severe failure. The b-value analysis demonstrated that during the early loading stage, the scale of internal microcracks within the thick and hard roof sandstone specimens gradually decreased with the optimization of the load-bearing structure. In the later loading stage, the scale of microcracks increased with the deterioration of the load-bearing structure. Furthermore, RA–AF analysis revealed that the specimens experienced combined tensile–shear failure, primarily dominated by tensile failure throughout. The AE characteristics observed during the deformation of thick and hard sandstone can provide references for the monitoring of roof stability and early warning of potential disasters in thick and hard sandstone conditions.

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Section: Introductionmentioning

confidence: 99%