Experimental investigation on the influence on mechanical properties and acoustic emission characteristics of granite after heating and water-cooling cycles

Cui, Yuan; Xue, Lei; Zhai, Mengyang; Xu, Chao; Bu, Fengchang; Wan, Li

doi:10.1007/s40948-023-00627-y

Cited by 10 publications

(4 citation statements)

References 63 publications

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“…The pore joint that is present in the rock specimen is compacted when the stress is greater than the rock's initial fracture stress. When the stress is continuously applied, new cracks gradually appear in the rock specimen, and the crack volumetric strain gradually increases [41]. The internal crack of the rock specimen is compressed during loading in the cycle of loading and unloading.…”

Section: Crack Volume Evolution Law Of Freeze-thaw Rock Under Cyclic ...mentioning

confidence: 99%

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Study on the Failure Process and Acoustic Emission Characteristics of Freeze–Thawed Sandstone under Cyclic Loading and Unloading

Yu,

Huang,

et al. 2024

Buildings

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In order to investigate freeze–thawed red sandstone failure processes under cyclic loading and unloading conditions, real-time acoustic emission (AE) and scanning electron microscopy (SEM) techniques were used to reveal the fracture process of the saturated red sandstone after cyclic loading and unloading tests using uniaxial compression. The results show that the stress–strain curves of the freeze–thawed sandstones show signs of hysteresis and exhibit a two-stage evolution of “sparse → dense”. In the cyclic loading and unloading process, the modulus of elasticity in the loading process is always larger than that in the unloading process, while the Poisson’s ratio is the opposite, and the radial irreversible strain and cumulative irreversible strain are larger than those in the axial direction. As the number of freeze–thaw cycles increases, the rock specimens need more cycles of loading and unloading to make the crack volume compressive strain Δεcv+ reach the maximum value and tend to stabilize, while the crack volume extensional strain Δεcv− tends to decrease gradually. This study also shows that the growth phase of the cyclic loading and unloading process has more ringing counts and a shorter duration, while the slow degradation phase has more ringing counts with loading and less with unloading. In addition, the F-T cycle gradually changes the internal microcracks of the red sandstone from shear damage, which is dominated by shear cracks, to tensile damage, which is dominated by tensile cracks. This study’s findings contribute to our knowledge of the mechanical characteristics and sandstone’s degradation process following F-T treatment, and also serve as a guide for engineering stability analyses conducted in the presence of multiphysical field coupling.

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Section: Crack Volume Evolution Law Of Freeze-thaw Rock Under Cyclic ...mentioning

confidence: 99%

“…Cui et al [41], Song et al [47], and Niu et al [49] suggested that the RA and AF indices of the AE parameters can be used to study the evolution of shear and tensile cracks in rocks.…”

Section: Evolution Of Rupture Mode (Ra-af) During Cyclic Loading and ...mentioning

confidence: 99%

Study on the Failure Process and Acoustic Emission Characteristics of Freeze–Thawed Sandstone under Cyclic Loading and Unloading

Yu,

Huang,

et al. 2024

Buildings

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“…On the one hand, this property of rock, namely low temperature-induced thermal stress cracking, can be harnessed to fracture rocks and enhance mining efficiency. On the other hand, the thermal damage of rock mass caused by low temperature-induced thermal stress will also pose a certain threat to the safety and stability of surrounding rocks [12][13][14]. Therefore, in order to overcome the bottleneck of deep resource mining and investigate the causes and mechanisms of mining-induced disasters in deep rock masses more effectively, it is crucial to conduct a comprehensive study on the mechanical properties of high-temperature rocks subjected to rapid cooling cycles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effect of Cyclic Heating and Water Cooling on Mixed-Mode I-II Fracture Characteristics of Sandstone

Zhang,

Hua,

Zhou

et al. 2024

Buildings

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In the process of underground resource extraction, deep rock masses are often subjected to cyclic-heating and water-cooling effects, which cause significant damage to the mechanical properties of rocks. In order to study the degradation mechanism of sandstone under cyclic heating and water cooling, many fracture experiments have been carried out. The effect of cyclic heating and water cooling at 200 °C on the tensile strength and the mixed-mode I-II fracture toughness of sandstone was investigated. The similarities and differences in the rock fracture characteristics and deterioration response of tensile properties are also examined. Meanwhile, the correlation between the microstructure and macroscopic fracture mechanical properties was revealed by observing the evolutionary pattern of rock microstructure. The findings demonstrate that the heating and water-cooling-induced variations in the tensile strength and fracture toughness of rock exhibit a consistent trend. The effective fracture toughness of sandstone decreases exponentially with increasing cycle times. The impact of the heating and water-cooling cycles on the fracture toughness of pure mode I is found to be more pronounced compared to that observed in mixed modes and pure mode II specimens. The failure mode of the rock sample undergoes a transition from abrupt to gradual, accompanied by an augmented development of cracks on the failure surface and finer fragmentation of rock debris. The results of this study can provide theoretical references for engineering practices such as the exploitation of geothermal resources and hydraulic fracturing.

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“…These parameters provide information on the principal physical characteristics of AE hits, and much effort has been made to relate them to their sources. For example, the statistical distribution of hit amplitudes was used to identify cracks in rocks and concrete by applying the "b-value" method [15,16]; the cumulative counts and AE energy rates have been related to different damage stages on rock specimens under different test conditions [17,18]; the amplitude values have been related to the lubricant composition in the monitoring of wire drawing process [19]; and the cumulative AE energy is commonly used to evaluate fatigue damage in concrete beams [20]. These parameters provide information on the principal physical characteristics of AE hits, and much effort has been made to relate them to their sources.…”

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confidence: 99%

Dimensionless Parameters for Waveform Characterization of Acoustic Emission Signals: Application to Sedimentation and Soil Compression Experiments

Castro,

García-Ros,

Villalva-León

et al. 2023

Symmetry

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Acoustic Emission (AE) is a non-destructive evaluation method that uses transient elastic waves produced by the sudden release of mechanical energy in a material or structure. This method generates multiple AE events during testing; therefore, it is important to develop parameters that capture the characteristics of each event (AE hit). The paper introduces new dimensionless parameters to characterize the waveform of AE signals: Earliness, Transitoriness, and Early Transitoriness. The study shows that these parameters provide an accurate description of AE waveforms, in some respects, better than traditional parameters, which makes them suitable for filtering with simple rules or in combination with machine-learning techniques. Two examples of the application of AE hit filtering from sedimentation and soil compression experiments are provided. In the sedimentation test analysis, the proposed parameters were used with K-means clustering to filter AE hits from outside the zone of interest and to calculate the rate of sedimentation. In the compression test of a sand sample under oedometric conditions, a simple filtering rule was applied to discriminate AE hits from unwanted sources and obtain a clear AE energy cumulative curve. In both cases, the dimensionless parameters have shown the capacity to discriminate between different AE sources and paths and the possibility of filtering hits from unwanted sources.

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Experimental investigation on the influence on mechanical properties and acoustic emission characteristics of granite after heating and water-cooling cycles

Cited by 10 publications

References 63 publications

Study on the Failure Process and Acoustic Emission Characteristics of Freeze–Thawed Sandstone under Cyclic Loading and Unloading

Study on the Failure Process and Acoustic Emission Characteristics of Freeze–Thawed Sandstone under Cyclic Loading and Unloading

Experimental Study on the Effect of Cyclic Heating and Water Cooling on Mixed-Mode I-II Fracture Characteristics of Sandstone

Dimensionless Parameters for Waveform Characterization of Acoustic Emission Signals: Application to Sedimentation and Soil Compression Experiments

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