Mechanical properties of gas hydrate-bearing sediments during hydrate dissociation

被引:0
|
作者
X. H. Zhang
D. S. Luo
X. B. Lu
L. L. Liu
C. L. Liu
机构
[1] Chinese Academy of Sciences,Institute of Mechanics
[2] University of Chinese Academy of Sciences,College of Engineering
[3] Ministry of Land and Resources,Key Laboratory of Gas Hydrate
[4] Qingdao Institute of Marine Geology,undefined
来源
Acta Mechanica Sinica | 2018年 / 34卷
关键词
Gas hydrate-bearing sediments; Dissociation; Mechanical properties; Shear strength; Triaxial test;
D O I
暂无
中图分类号
学科分类号
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 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.
引用
收藏
页码:266 / 274
页数:8
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