The effects of sorbing and non-sorbing gases on ultrasonic wave propagation in fractured coal

Lv, Adelina; Aghighi, Mohammad Ali; Masoumi, Hossein; Roshan, Hamid

doi:10.1016/j.coal.2021.103906

International Journal of Coal Geology

2022

DOI: 10.1016/j.coal.2021.103906

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The effects of sorbing and non-sorbing gases on ultrasonic wave propagation in fractured coal

Adelina Lv¹,

Mohammad Ali Aghighi²,

Hossein Masoumi

et al.

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Cited by 6 publications

References 49 publications

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The combined effect of fractures and mineral content on coal hydromechanical response

Bahaaddini

Masoumi

et al. 2022

Bull Eng Geol Environ

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The hydromechanical behaviour of fractured coal is a complex function of interaction between coal bulk and fracture deformation driven by fluid pressure and external stress. Despite the research studies conducted to date, the combined effect of mineral content and fracture structure on hydromechanical behaviour of sorptive fractured coal remains unexplored. To study this combined effect, we performed a series of X-ray computed tomography (XRCT) imaging on a range of coal specimens with non-sorbing (helium) and sorbing (CO2) gases at different effective stress paths using a newly developed X-ray transparent triaxial system. The compressibility of system components was obtained from processed 3D XRCT images which were used to interpret the results. The results of this study show that coal matrix/solid compressibility has a positive nonlinear relation with mineral content irrespective of mineral type. Effective stress coefficient is also a strong function of both mineral content and fracture porosity. Furthermore, the increase in mineral content leads to less fracture opening by an increase in helium pressure. Interestingly, the effect of mineral content on the bulk strength of coal is more significant than the effect of fracture porosity. Finally, coal with more open fractures shows less bulk swelling by gas adsorption under external stress due to damping effect of fracture volume on developed internal volumetric swelling strain.

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The combined effect of fractures and mineral content on coal hydromechanical response

Bahaaddini

Masoumi

et al. 2022

Bull Eng Geol Environ

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A theoretical and experimental investigation of gas adsorption-dependent bulk modulus of fractured coal

Su¹,

Lv²,

Aghighi³

et al. 2022

International Journal of Coal Geology

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Estimating the geological strength index and disturbance factor in the Hoek–Brown criterion using the acoustic wave velocity in the rock mass

Xia

Chen

Wang

et al. 2022

Engineering Geology

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The effects of sorbing and non-sorbing gases on ultrasonic wave propagation in fractured coal

Cited by 6 publications

References 49 publications

The combined effect of fractures and mineral content on coal hydromechanical response

The combined effect of fractures and mineral content on coal hydromechanical response

A theoretical and experimental investigation of gas adsorption-dependent bulk modulus of fractured coal

Estimating the geological strength index and disturbance factor in the Hoek–Brown criterion using the acoustic wave velocity in the rock mass

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