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Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation 预览

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摘要 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 theGHsaturation 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.
出处 《力学学报:英文版》 SCIE EI CAS CSCD 2018年第2期266-274,共9页 Acta Mechanica Sinica
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