Prediction of the static elastic modulus of limestone using downhole seismic test in Asmari formation

Daraei, Ako; Sharifi, Fereydoun; Qader, Diyar N.; Ali, Hunar Farid Hama; Kolivand, Farshad

doi:10.1007/s11600-023-01109-1

Cited by 5 publications

(2 citation statements)

References 23 publications

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“…Song et al [16] investigated the strength characteristics and progressive damage mechanism of soft rock-coal assemblage, reporting on interface effects. Daraei et al [17] predicted the limestone static elastic modulus from seismic tests. Yin et al [18] investigated the uniaxial compressive damage of a composite specimen of coal from persistent nodal caprock-coal-surface rock by numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Fractal Damage and Acoustic Emissions of Soft Rock–Coal Combinations in a Deep Mining Area

Liang,

Wang,

Jiang

et al. 2023

Processes

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Weakly cemented soft rock mines in the Ordos Basin are susceptible to mining disasters, including roof collapse and substantial deformation of surrounding rocks, during coal mining operations. Researching the damage characteristics of structures composed of low-strength “soft rock–coal” combinations is crucial for effectively preventing and controlling disasters in deep soft rock mining. To investigate the fractal damage characteristics of soft rock–coal combinations with different height ratios, uniaxial compression tests were conducted on specimens containing soft rock percentages of 20%, 40%, 50%, 60%, and 80%. The results show that the uniaxial compressive strength and modulus of elasticity of the soft rock–coal combinations increased with increasing proportions of soft rock. The soft rock–coal combination was clearly segmented, and the 40%, 50%, and 60% soft rock–coal combinations had good self-similarity. The fractal dimensions were 2.374, 2.508 and 2.586, which are all within the interval [2, 3]. When the percentage of soft rock was 20%, the specimen damage yielded flaky coal bodies with smaller grain size, whereas the coal–rock interface was spalled by small conical rock bodies. As the soft rock proportion increased, the percentage mass of fragments with particle size greater than 20 mm increased from 83.34% to 94.15%. The failure mode in soft rock–coal combinations is primarily attributed to the partial tensile splitting of the coal body. As the proportion of soft rock increased, there was a gradual reduction in the extent of coal body damage. Moreover, the acoustic emission absolute energies and counts decreased as the proportion of soft rock increased. The acoustic emission energy was reduced from 2.46 × 109 attoJ to 3.41 × 108 attoJ, and the acoustic emission counts were reduced from 18,276 to 7852.

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Section: Introductionmentioning

confidence: 99%

Evaluating Fractal Damage and Acoustic Emissions of Soft Rock–Coal Combinations in a Deep Mining Area

Liang,

Wang,

Jiang

et al. 2023

Processes

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“…Ako Daraei et al [21] conducted uniaxial compressive tests on 78 rock samples and discussed the changes in the compressive strength and deformation modulus of rock masses under different saturation degrees. Ako Daraei et al [22] determined the dynamic modulus of a tunnel in western Iran through downhole seismic testing (DS) and proposed a linear correlation between the static and dynamic elastic moduli (Es − E d ).…”

Section: Introductionmentioning

confidence: 99%

Fracture Process and Failure Characteristics of Sandstone with Different Height-to-Diameter Ratios

Zhang,

Li,

Yan

et al. 2023

Processes

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The mechanical properties of rock materials significantly depend on their size due to their heterogeneity and the spatial randomness of joint development—a factor often neglected in pillar design and stability analyses within mining engineering. The rock samples examined herein were 100 mm in diameter and 100 mm, 200 mm, or 300 mm in height. This research analyzed the respective mechanical phenomena and failure patterns of rock specimens with varying height-to-diameter ratios under uniaxial compression. The experiment showed that the greater the height-to-diameter ratio, the smaller the elastic modulus and compressive strength. Remarkably, as the height-to-diameter ratio grew, the failure forms of the samples transitioned from splitting to shearing, while their peak strength gradually diminished. Specifically, a hike from 1:1 to 3:1 in the height-to-diameter ratio led to a roughly 20% decrease in peak strength. Utilizing the real rock fracture process analysis system (RFPA3D), the fracture processes and failure characteristics of rock specimens with dissimilar aspect ratios were comparatively explored from a microscopic viewpoint, with acoustic emissions revealing the entire process from crack initialization to penetration. The failure analysis affirmed that the simulation results corresponded closely with the experimental findings. The resultant research can offer theoretical support for the multiscale mechanical properties, fracture processes, and prediction of rock failure in mining engineering.

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Macro–Micro Failure and Energy Evolution in Heterogeneous Fault Rock Masses

Chen,

Liu,

Gao

et al. 2023

Geotech Geol Eng

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Prediction of the static elastic modulus of limestone using downhole seismic test in Asmari formation

Cited by 5 publications

References 23 publications

Evaluating Fractal Damage and Acoustic Emissions of Soft Rock–Coal Combinations in a Deep Mining Area

Evaluating Fractal Damage and Acoustic Emissions of Soft Rock–Coal Combinations in a Deep Mining Area

Fracture Process and Failure Characteristics of Sandstone with Different Height-to-Diameter Ratios

Macro–Micro Failure and Energy Evolution in Heterogeneous Fault Rock Masses

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