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:10.1016/j.ijrmms.2023.105497

Cited by 11 publications

(5 citation statements)

References 66 publications

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“…In this case, the shale has shown overall damage, and the compressive strength of the shale drops sharply to zero. Consistent with the findings of Abbas et al [22], the destruction process can be divided into four stages. The first stage: when the stress gradually increases with the strain, the load seat and the natural micro-crack close.…”

Section: Stress-strain Curve Of Shale Materials At Room Temperaturesupporting

confidence: 86%

“…Crack initiation and its effects on the dynamic behavior of rock, particularly regarding ultrasonic wave velocity, have been studied extensively in recent years. Numerical manifold method (NMM) simulations have been used to investigate the propagation of stress waves through the fractured rock mass [22]. A study by Fan [23] demonstrated that the stress wave velocity is affected by the size and orientation of the fractures, as well as the properties of the surrounding rock's matrix.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic Mechanical Properties of Heat-Treated Shale under Different Temperatures

Gao,

Deng,

Sun

et al. 2023

Applied Sciences

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As a typical rock, shale’s reservoir depth is about 1500–4000 m, and the temperature of the shale reservoir at this depth is 150 °C. Therefore, in order to study the dynamic strength of shale at this temperature, it is necessary to consider the effects of temperature and strain rate on the dynamic strength of shale, and then establish the damage constitutive model of shale. This paper took black shale from the Sichuan Basin as the research object, combined it with the separated Hopkinson bar experiment and temperature control system, and conducted the Hopkinson bar experiment on shale at room temperature, 60 °C, 90 °C, 120 °C, and 150 °C, and at three groups of air pressures of 0.2 MPa, 0.3 MPa, and 0.4 MPa. The stress–strain curves of shale at the same strain rate and different temperature and at the same temperature and different strain rate were obtained. In the temperature difference range of this experiment, the dynamic strength of the sample presented two opposite trends (increasing and decreasing) with the increase in temperature, which was determined via the direction of the bedding. The peak strength linearly increased with the increase in strain rate. Based on the Weibull statistical distribution and the D–P failure criterion, a statistical damage constitutive model of shale dynamic strength considering the effects of temperature and strain rate was obtained. By modifying the parameters F0 and m, the dynamic strength statistical damage constitutive model of shale was in good agreement with the experimental results.

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Section: Stress-strain Curve Of Shale Materials At Room Temperaturesupporting

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Dynamic Mechanical Properties of Heat-Treated Shale under Different Temperatures

Gao,

Deng,

Sun

et al. 2023

Applied Sciences

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“…Abbas et al tested the parameters of ultrasonic wave velocity, amplitude, and energy of composite sand shale and evaluated the macroscopic deformation and crack propagation of the sample. Abbas [32] et al evaluated the macroscopic deformation and crack propagation of the sample using parameters such as the ultrasonic wave velocity, amplitude, and energy of composite sand shale. Rodríguez [33] et al analyzed the distribution of damage within rock specimens under diametral compression with P-wave velocity calculation.…”

Section: Introductionmentioning

confidence: 99%

An Improved Rock Damage Characterization Method Based on the Shortest Travel Time Optimization with Active Acoustic Testing

Zhou,

Liu,

Zhao

et al. 2024

Mathematics

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Real-time evaluation of the damage location and level of rock mass is essential for preventing underground engineering disasters. However, the heterogeneity of rock mass, which results from the presence of layered rock media, faults, and pores, makes it difficult to characterize the damage evolution accurately in real time. To address this issue, an improved method for rock damage characterization is proposed. This method optimizes the solution of the global shortest acoustic wave propagation path in the medium and verifies it with layered and defective media models. Based on this, the relationship between the inversion results of the wave velocity field and the distribution of rock damage is established, thereby achieving quantitative characterization of rock damage distribution and degree. Thus, the improved method is more suitable for heterogeneous rock media. Finally, the proposed method was used to characterize the damage distribution evolution process of rock media during uniaxial compression experiments. The obtained results were compared and analyzed with digital speckle patterns, and the influencing factors during the use of the proposed method are discussed.

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“…Especially for rocks in which no reversal of the axial stress-volumetric strain can be observed prior to failure, the stress threshold determination method using axial and lateral crack strains is proposed to determine the crack damage stress (Mo et al, 2024). Moreover, the crack damage stress can be identified by analysing acoustic emissions (Chang and Lee, 2004;Wu et al, 2021;Abbas et al, 2023).…”

Section: Introductionmentioning

confidence: 99%

Crack damage stress in fully saturated, permeable rocks: A new detection procedure

Schumacher,

Gräsle

2024

Preprint

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Abstract. To detect the crack damage stress also known as onset of dilatancy in fully saturated rocks, we propose a new procedure which combines an innovative measurement technique using pore pressure diffusion with the well known technique of finding the pore pressure maximum. A precise determination of the crack damage stress is required to establish parameter dependencies and ultimately to develop a constitutive equation for the crack damage stress, which is of significant interest e.g. for the long-term safety analysis of repositories for radioactive waste. The new technique monitors the true axial strain as indicator for the crack damage stress during a pore pressure diffusion test. In addition to the crack damage stress, this new true axial strain method simultaneously yields pore pressure diffusion coefficients, thereby maximising the information gain. The true axial strain method was developed based on a multi-cycle, long-term experiment of one sample of Passwang Marl, but it can be applied to other types of rocks, which is demonstrated on a Bunter Sandstone.

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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

Cited by 11 publications

References 66 publications

Dynamic Mechanical Properties of Heat-Treated Shale under Different Temperatures

Dynamic Mechanical Properties of Heat-Treated Shale under Different Temperatures

An Improved Rock Damage Characterization Method Based on the Shortest Travel Time Optimization with Active Acoustic Testing

Crack damage stress in fully saturated, permeable rocks: A new detection procedure

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