岩土力学2018，Vol.39Issue(4)：1153-1158,6.DOI:10.16285/j.rsm.2016.0794
一个深海能源土弹塑性本构模型
An elasto-plastic constitutive model for methane hydrate bearing sediments
摘要
Abstract
Methane hydrate (MH) is usually formed in marine deposit under specific temperature and pressure conditions.MH can enhance the shear strength of its bearing sediments due to bonding effect.Based on the framework of damage mechanics,the structured sand constitutive model is employed to simulate the mechanical behavior of methane hydrate bearing sediments.By simulating the consolidated drained triaxial compression tests,a quantitative relationship between the initial yield parameter and the methane hydrate saturation is developed according to the stress-strain relationship.The primary damage law is modified to develop an elasto-plastic constitutive model for methane hydrate bearing sediments.Furthermore,another set of triaxial tests and isotropic compression test on methane hydrate bearing sediments are simulated by the established model.Results show that this elasto-plastic constitutive model can effectively describe the relationship between the mechanical behavior of methane hydrate bearing sediments and the methane hydrate saturation.When methane hydrate saturation increases,the peak shear stress and the secant modulus increase in the triaxial tests,and the yielding stress under isotropic path increases along isotropic compression path.关键词
深海能源土/本构模型/水合物饱和度Key words
methane hydrate bearing sediments/constitutive model/saturation of hydrate分类
建筑与水利引用本文复制引用
蒋明镜,刘俊,周卫,奚邦禄..一个深海能源土弹塑性本构模型[J].岩土力学,2018,39(4):1153-1158,6.基金项目
国家自然科学基金项目(No.51579178) （No.51579178）
土木工程防灾国家重点实验室基金项目(No.SLDRCE14-A-04).This work was supported by the National Natural Science Foundation of China (51579178) and the State Key Laboratory Disaster Reduction in Civil Engineering (SLDRCE14-A-04). （No.SLDRCE14-A-04）
