Experimental study on mechanical properties of pore-filling and fracture-filling clayey silt hydrate-bearing sediments

Wei Guo, Yiming Li, Rui Jia, Yuan Wang, Gege Tang and Xiaolin Li

Energy, 2023, vol. 284, issue C

Abstract: Pore–filling and fracture–filling hydrates are widely distributed in marine clayey silt sediments. The filling characteristics of hydrates significantly affect the mechanical properties of sediments, which closely related to the hydrate safe exploitation. In this study, the differences in the mechanical properties between pore–filling hydrate–bearing sediment (PFHBS) and fracture–filling hydrate–bearing sediment (FFHBS) were compared and analyzed through a series of triaxial tests. Results showed that PFHBS and FFHBS significantly differed in mechanical properties under identical conditions. PFHBS and FFHBS with different hydrate saturations exhibited different stress–strain relationships. The enhancement effect of hydrates on the strength parameters of samples at the same saturation increment was influenced by the filling characteristics. Under identical hydrate saturation conditions, the failure strength and Young's modulus of FFHBS surpassed those of PFHBS, and the cohesion and internal friction angle of FFHBS increased by 76.92 % and 4.25 %, respectively, compared with those of PFHBS, while FFHBS exhibited greater volume expansion than PFHBS. The number of fracture layers in FFHBS had a positive correlation with the strength parameters of samples, yet intensified volume expansion. PFHBS and FFHBS exhibited different strength enhancement and shear mechanisms due to different hydrate filling characteristics.

Keywords: Hydrate filling characteristics; Pore–filling hydrate; Fracture–filling hydrate; Hydrate–bearing sediments; Strength and deformation (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:284:y:2023:i:c:s0360544223027482

DOI: 10.1016/j.energy.2023.129354

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