TRIAXIAL SHEAR TESTS AND STATISTICAL ANALYSES OF DAMAGE FOR METHANE HYDRATE-BEARING SEDIMENTS

Liu Lele; Zhang Xuhui; Liu Changling; Ye Yuguang

doi:10.6052/0459-1879-15-400

Volume 48 Issue 3

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Chinese Journal of Theoretical and Applied Mechanics > 2016 > 48(3): 720-729. > DOI: 10.6052/0459-1879-15-400 CSTR: 32045.14.0459-1879-15-400

Liu Lele, Zhang Xuhui, Liu Changling, Ye Yuguang. TRIAXIAL SHEAR TESTS AND STATISTICAL ANALYSES OF DAMAGE FOR METHANE HYDRATE-BEARING SEDIMENTS[J]. Chinese Journal of Theoretical and Applied Mechanics, 2016, 48(3): 720-729. DOI: 10.6052/0459-1879-15-400

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TRIAXIAL SHEAR TESTS AND STATISTICAL ANALYSES OF DAMAGE FOR METHANE HYDRATE-BEARING SEDIMENTS

1.
The Key Laboratory of Gas Hydrate, Ministry of Land and Resources, Qingdao Institute of Marine Geology, Qingdao 266071, Chin
2. Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

Received Date: November 02, 2015
Revised Date: January 13, 2016

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Abstract

Abstract

Any perturbation to the thermodynamic equilibrium by exploitation may push out hydrate-bearing sediments (HBS) out of the stability zone, thus inducing hydrate dissociation, loss of cementation, which, in turn, can cause submarine landslides and loss of platform foundations during gas extraction operations. Therefore, a thorough understanding of mechanical properties of HBS is of great importance for stability analyses under di erent environmental conditions. A series of drained triaxial shear tests were carried out on a self-developed apparatus with the samples prepared by gas diffusion method, in which the time domain reflectometry technique was used in measurement of hydrate saturations in real time. A meso-mechanical and mixed model for the elastic modulus of HBS was proposed based on the classical series and parallel models, including the parameter of statistical force transfer paths between particles in HBS. A constitutive model of HBS was improved by coupling the statistical damage theory and the Mohr-Coulomb failure criterion. It is shown that the stress-strain curve changes from strain-hardening into strain-softening with the increase of hydrate saturation and the decrease of e ective confining pressure; the secant modulus and the peak strength of HBS increase when the hydrate saturation and the e ective confining pressure increase; the cohesion of HBS increases obviously with the increase of hydrate content, and the internal friction angle changed little with the increase of hydrate amount; the proposed mixed model for elastic modulus and the constitutive model of HBS are both reasonable and feasible.
- hydrate-bearing sediments,
- time domain Reflectometry,
- triaxial shear tests,
- mixed model,
- statistical damage theory

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References

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TRIAXIAL SHEAR TESTS AND STATISTICAL ANALYSES OF DAMAGE FOR METHANE HYDRATE-BEARING SEDIMENTS