考虑赋存模式影响的含水合物沉积物的本构模型研究

发布时间：2018-01-04 16:24

本文关键词：考虑赋存模式影响的含水合物沉积物的本构模型研究　出处：《岩土力学》2017年01期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:Both hydrate content and hydrate occurrence model have an effect on the mechanical properties of hydrate-bearing sediments. However, the current constitutive model seldom considers the effect of hydrate occurrence model. Based on the analysis of the influence mechanism of hydrate occurrence model on the mechanical properties of hydrate bearing sediments. The effective hydrate saturation is used to describe the effect of hydrate occurrence model on the mechanical properties of sediments. Based on the statistical damage constitutive model of hydrate sediments established by predecessors. Assuming that the microelement strength of hydrate sediment is distributed from Weibull, the Drucker-Prager strength criterion is used to describe the microelement strength. The statistical damage constitutive model of hydrate sediment considering the effect of hydrate occurrence model is established, which modifies the relationship between hydrate content and experimental confining pressure on elastic model. The relationship between the model parameters m and FV _ 0 and the hydrate saturation s _ h and the test confining pressure 蟽 _ 3 is established. This model can well simulate the stress-strain relationship of hydrate sediment and reflect the stiffness and strength of hydrate content and hydrate occurrence model to hydrate sediment. The effect of strain softening and other mechanical properties.
【作者单位】：桂林理工大学广西建筑新能源与节能重点实验室;桂林理工大学土木与建筑工程学院;
【基金】：国家自然科学基金(No.11562007,No.51239010,No.51309055) 广西自然科学基金(2014GXNSFBA118236)~~
【分类号】：TE31
【正文快照】： 天然气水合物是一种由甲烷气体和水在低温、高压条件下形成的类似于冰状的固体物质。它在自然界中主要分布于永久冻土区和海洋大陆架区域,目前被视为一种未来的替代性能源[1]。天然气水合物与赋存沉积物称之为含天然气水合物沉积物,以下简称含水合物沉积物。研究表明,水合物的

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