Statistical damage constitutive model based on self-consistent Eshelby method for natural gas hydrate sediments,Energy Science & Engineering

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Statistical damage constitutive model based on self-consistent Eshelby method for natural gas hydrate sediments
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2021-09-14 , DOI: 10.1002/ese3.968
Feifei Wang _{1,

2} , Zizhen Wang ₃ , Di Zhang ₁ , Zhenqing Wang ₁

Affiliation

Natural gas hydrate (NGH) is widely distributed in marine sediments and continental permafrost, which is a promising energy resource. The sustainable and safe exploration and production of NGH requires fully understanding of its mechanical behaviors, which is still a challenge to our community. In this paper, a statistical damage constitutive model named SC-SDCM is developed for NGH sediments. The NGH sediments are regarded as two phases: the matrix phase of solid mineral grains, pore fluid, and gas, and the inclusion phase of hydrate crystal. The effective elastic parameters of such two-phase composite are estimated by self-consistent method (SC) according to the equivalent inclusion principle of micromechanics. The mesoscopic element strength of the NGH sediments is described by the Weibull statistical distribution and the damage theory of composite materials. And then combined with the Drucker-Prager failure criterion of microelement, the damage constitutive model of NGH sediments is established. The new SC-SDCM is tested to be reliable and robust by triaxial experimental observations on artificial cores and naturally occurring samples under different confining pressures and hydrate saturations. The SC-SDCM could properly describe the stiffness, peak strength, and strain softening properties of the NGH sediments. Moreover, the predictions of SC-SDCM are closest to the experiment observations compared to several published constitutive models, especially for the near- and after-damage stages with relatively high hydrate saturation.

中文翻译：

基于自洽Eshelby法的天然气水合物沉积物统计损伤本构模型

天然气水合物（NGH）广泛分布于海洋沉积物和大陆永久冻土中，是一种很有前景的能源资源。NGH的可持续和安全勘探和生产需要对其力学行为有充分的了解，这对我们社区来说仍然是一个挑战。在本文中，针对 NGH 沉积物开发了一种名为 SC-SDCM 的统计损伤本构模型。NGH沉积物被认为是两相：固体矿物颗粒、孔隙流体和气体的基质相和水合物晶体的包裹相。这种两相复合材料的有效弹性参数是根据微观力学的等效包含原理，通过自洽法（SC）估计的。NGH沉积物的细观元素强度由Weibull统计分布和复合材料损伤理论描述。然后结合微量元素的Drucker-Prager破坏准则，建立了NGH沉积物的损伤本构模型。通过在不同围压和水合物饱和度下对人工岩心和天然样品进行三轴实验观察，测试新的 SC-SDCM 的可靠性和稳健性。SC-SDCM 可以正确描述 NGH 沉积物的刚度、峰值强度和应变软化特性。此外，与几个已发表的本构模型相比，SC-SDCM 的预测最接近实验观察结果，特别是对于水合物饱和度相对较高的近损伤和损伤后阶段。然后结合微量元素的Drucker-Prager破坏准则，建立了NGH沉积物的损伤本构模型。通过在不同围压和水合物饱和度下对人工岩心和天然样品进行三轴实验观察，测试新的 SC-SDCM 的可靠性和稳健性。SC-SDCM 可以正确描述 NGH 沉积物的刚度、峰值强度和应变软化特性。此外，与几个已发表的本构模型相比，SC-SDCM 的预测最接近实验观察结果，特别是对于水合物饱和度相对较高的近损伤和损伤后阶段。然后结合微量元素的Drucker-Prager破坏准则，建立了NGH沉积物的损伤本构模型。通过在不同围压和水合物饱和度下对人工岩心和天然样品进行三轴实验观察，测试新的 SC-SDCM 的可靠性和稳健性。SC-SDCM 可以正确描述 NGH 沉积物的刚度、峰值强度和应变软化特性。此外，与几个已发表的本构模型相比，SC-SDCM 的预测最接近实验观察结果，特别是对于水合物饱和度相对较高的近损伤和损伤后阶段。通过在不同围压和水合物饱和度下对人工岩心和天然样品进行三轴实验观察，测试新的 SC-SDCM 的可靠性和稳健性。SC-SDCM 可以正确描述 NGH 沉积物的刚度、峰值强度和应变软化特性。此外，与几个已发表的本构模型相比，SC-SDCM 的预测最接近实验观察结果，特别是对于水合物饱和度相对较高的近损伤和损伤后阶段。通过在不同围压和水合物饱和度下对人工岩心和天然样品进行三轴实验观察，测试新的 SC-SDCM 的可靠性和稳健性。SC-SDCM 可以正确描述 NGH 沉积物的刚度、峰值强度和应变软化特性。此外，与几个已发表的本构模型相比，SC-SDCM 的预测最接近实验观察结果，特别是对于水合物饱和度相对较高的近损伤和损伤后阶段。

更新日期：2021-11-02

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