Failure mechanics

Fjær, Erling; Holt, R.M.; Horsrud, Per; Raaen, A.M.; Risnes, Rasmus

doi:10.1016/b978-0-12-822195-2.00011-5

Cited by 1 publication

(1 citation statement)

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“…The function that characterizes the failure conditions of materials is called the strength criterion. Among many strength criteria, the Mohr-Coulomb criterion (M-C criterion) is the most widely applied in engineering practice because of its simplicity, practicality, and simple parameter acquisition [30]. The M-C criterion states that when the ratio of shear stress to normal stress on the shear plane of a material reaches the maximum, the material will yield and collapse.…”

Section: Shear Strength and Peak Strengthmentioning

confidence: 99%

Mechanical Characteristics of Gas Hydrate-Bearing Sediments: An Experimental Study from the South China Sea

Yuan,

Kong,

Liang

et al. 2024

JMSE

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Clarifying the mechanical characteristics of gas hydrate-bearing sediments (GHBS) from a mechanical perspective is crucial for ensuring the long-term, safe, and efficient extraction of natural gas hydrates. In this study, seabed soft clay from the northern South China Sea was utilized to prepare clayey silt samples, aligning with gradation curves related to hydrate extraction projects in the Shenhu area of the South China Sea. Utilizing the high-pressure low-temperature hydrate triaxial testing system (ETAS), twelve sets of triaxial shear tests were conducted. The results highlight that increases in hydrate saturation and confining pressure significantly enhance GHBS’ strength and stiffness, with more pronounced volume expansion observed during shearing. These tests have elucidated the mechanical responses of GHBS. Subsequently, empirical formulas were developed to characterize their properties under varying conditions. Additionally, based on the experimental data, the micro-mechanisms of GHBS were analyzed, suggesting that hydrates notably contribute to the filling and cementing effects in GHBS, with these effects varying with changes in hydrate saturation and confining pressure. This study contributes to a deeper understanding of the fundamental mechanical properties of GHBS.

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Section: Shear Strength and Peak Strengthmentioning

confidence: 99%