论文部分内容阅读
水合物含量和水合物赋存模式都会对含水合物沉积物的力学特性产生影响,但目前的本构模型很少考虑水合物赋存模式的影响。在分析水合物赋存模式对含水合物沉积物力学特性影响机制的基础上,提出了采用有效水合物饱和度来描述水合物赋存模式对沉积物力学特性的影响。基于前人建立的含水合物沉积物的统计损伤本构模型,假设含水合物沉积物微元强度服从Weibull分布,采用Drucker-Prager强度准则描述微元强度,建立了考虑水合物赋存模式影响的含水合物沉积物的统计损伤本构模型。该模型修正了水合物含量和试验围压对弹性模型的影响关系式,并且建立了模型参数m和F_0与水合物饱和度s_h和试验围压σ_3之间的关系。通过与试验数据的对比,说明该模型能很好地模拟含水合物沉积物的应力-应变关系,反映水合物含量和水合物赋存模式对含水合物沉积物的刚度、强度、应变软化等力学特性的影响规律。
Both the hydrate content and the hydrate occurrence patterns affect the mechanical properties of hydrate-bearing sediments, but the present constitutive models seldom consider the impact of hydrate occurrence patterns. Based on the analysis of the influence mechanism of hydrate occurrence modes on the mechanical properties of hydrate-bearing sediments, the effect of hydrate saturation on the mechanical properties of sediments was proposed. Based on the statistical damage constitutive model of hydrate-bearing sediments established in the past, assuming that the elemental strength of hydrate-bearing sediments obeys Weibull distribution and the strength of elemental elements is described by Drucker-Prager intensity criterion, Statistical Damage Constitutive Model for Hydrate-bearing Sediments. The model corrects the influence of hydrate content and confining pressure on elastic model, and establishes the relationship between model parameters m and F_0 and hydrate saturation s_h and test confining pressure σ_3. The comparison between the experimental data and the experimental data shows that the model can well simulate the stress-strain relationship of hydrate-bearing sediments, and reflect the hydrate content and hydrate accumulation patterns on the hydrate sediment’s stiffness, strength and strain softening Mechanical characteristics of the law of influence.