Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation

The changes in the mechanical properties of gas hydrate-bearing sediments (GHBS) induced by gas hydrate (GH) dissociation are essential to the evaluation of GH exploration and stratum instabilities. Previous studies present substantial mechanical data and constitutive models for GHBS at a given GH s...

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Bibliographic Details
Published in:Acta Mechanica Sinica
Main Authors: 张旭辉, 罗大双, 鲁晓兵, 刘乐乐, Liu CL
Format: Report
Language:English
Published: 2018
Subjects:
Gas hydrate-bearing sediments
Dissociation
Mechanical properties
Shear strength
Triaxial test
METHANE-HYDRATE
STRENGTH
BEHAVIOR
MODEL
SAND
Engineering
Mechanical
Mechanics
二类
Methane hydrate
Online Access:http://dspace.imech.ac.cn/handle/311007/77809
https://doi.org/10.1007/s10409-017-0699-y
Description
Summary:The changes in the mechanical properties of gas hydrate-bearing sediments (GHBS) induced by gas hydrate (GH) dissociation are essential to the evaluation of GH exploration and stratum instabilities. Previous studies present substantial mechanical data and constitutive models for GHBS at a given GH saturation under the non-dissociated condition. In this paper, GHBS was formed by the gas saturated method, GH was dissociated by depressurization until the GH saturation reached different dissociation degrees. The stress-strain curves were measured using triaxial tests at a same pore gas pressure and different confining pressures. The results show that the shear strength decreases progressively by 30%-90% of the initial value with GH dissociation, and the modulus decreases by 50% -75%. Simplified relationships for the modulus, cohesion, and internal friction angle with GH dissociated saturation were presented.

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