Damage statistic constitutive model of hydrate-bearing sediments and the determination method of parameters

被引：0
|
作者：
Li Y. [1 ,2 ]
Liu C. [1 ,2 ]
Liu L. [1 ,2 ]
机构：
[1] The Key Laboratory of Gas Hydrate, Qingdao Institute of Marine Geology, China Geologial Servey, Qingdao, 266071, Shandong
[2] Laboratory for Marine Mineral Resources, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, Shandong
来源：
Liu, Changling (qdliuchangling@163.com) | 1600年 / Science Press卷 / 37期
关键词：
Constitutive model; Damage statistic; Effective confining pressure; Hydrate-bearing sediments; Mechanical response;
D O I：
10.7623/syxb201610007
中图分类号：
学科分类号：
摘要：
To effectively develop natural gas hydrate resources, it is essential to construct a constitutive model for gas hydrate-bearing sediments, reveal the deformation law of sediments, and precisely predict the mechanical properties of the hydrate reservoir. Based on the basic assumption that the micro-unit strength of hydrate-bearing sediments obeys the Drucker-Prager criterion and Weibull distribution law, a new statistic damage constitutive model which can simultaneously describe the strain softening and hardening law was established by combining the statistical damage theory and statistical strength theory. On this basis, the solution of model parameters was explored and the accuracy of the model was also verified. The study demonstrates that the hydrate-bearing sediments being strain softening or strain hardening phenomeon after yielding is controlled by the combined influence of effective confining pressure and hydrate saturation, which is reflect by the conjugacy of F0 and m in Weibull model. Moreover, model parameters mainly affect the evolution of hydrate-bearing sediments after the damage, and has less impact on the undamaged part. © 2016, Editorial Office of ACTA PETROLEI SINICA. All right reserved.
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页码：1273 / 1279
页数：6
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