A Critical State Constitutive Model for Methane Hydrate‐Bearing Sediments Considering Hydrate Pore‐Filling and Cementing Effects

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-10-18 DOI:10.1002/nag.3873
Bin Zhu, Simin Yuan, Lujun Wang, Yanjing Liu, Yunmin Chen
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Abstract

To safely and effectively explore the natural methane hydrate, it is crucial to examine the mechanical behavior of methane hydrate‐bearing sediments (MHBSs). Natural methane hydrate unevenly distributes in pores or bonds with soil particles in MHBS, changing the mechanical behavior of MHBS including stiffness, shear strength, and dilatancy. This paper presents an anisotropic critical state model for MHBS considering hydrate pore‐filling and cementing effects. Based on the unified critical state model for both clay and sand, an equivalent hydrate ratio is defined to address pore‐filling effect. Cohesive strength and its hardening law are introduced to characterize hydrate cementation. To describe the anisotropic behavior, the inherent anisotropy of soil particles and hydrates are modeled separately, and rotation hardening is introduced to describe the stress‐induced anisotropy. Comparisons with existing triaxial tests of both synthetic and natural MHBS demonstrate that the proposed model comprehensively describes the mechanical behavior of MHBS. Detailed predictions indicate that hydrate pore‐filling affects the hydrate‐dependent stiffness and dilatancy of MHBS, which become more pronounced with increasing hydrate saturation. Cementing effect increases the initial stiffness and peak strength of MHBS. The pronounced influence of inherent anisotropic parameters on pre‐peak stress–strain relation of MHBS is noted, and increasing hydrate saturation enhances the effect of hydrate anisotropy. These predictions contribute to a better understanding of the relation between hydrate morphologies and MHBS mechanical properties.
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考虑水合物孔隙填充和胶结效应的含甲烷水合物沉积物临界状态构造模型
为了安全有效地勘探天然甲烷水合物,研究含甲烷水合物沉积物(MHBSs)的力学行为至关重要。天然甲烷水合物会不均匀地分布在 MHBS 的孔隙中或与土壤颗粒结合,从而改变 MHBS 的力学行为,包括刚度、剪切强度和膨胀性。本文提出了考虑水合物孔隙填充和胶结效应的 MHBS 各向异性临界状态模型。基于粘土和砂的统一临界状态模型,定义了等效水合物比以解决孔隙填充效应。引入了内聚强度及其硬化定律来描述水合物胶结。为描述各向异性行为,分别对土壤颗粒和水合物的固有各向异性进行建模,并引入旋转硬化来描述应力引起的各向异性。与现有的合成和天然 MHBS 三轴试验比较表明,所提出的模型全面描述了 MHBS 的力学行为。详细预测表明,水合物孔隙填充会影响 MHBS 与水合物有关的刚度和膨胀性,随着水合物饱和度的增加,刚度和膨胀性会变得更加明显。固结效应增加了 MHBS 的初始刚度和峰值强度。注意到固有各向异性参数对 MHBS 峰前应力-应变关系的显著影响,水合物饱和度的增加增强了水合物各向异性的影响。这些预测有助于更好地理解水合物形态与 MHBS 机械性能之间的关系。
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来源期刊
CiteScore
6.40
自引率
12.50%
发文量
160
审稿时长
9 months
期刊介绍: The journal welcomes manuscripts that substantially contribute to the understanding of the complex mechanical behaviour of geomaterials (soils, rocks, concrete, ice, snow, and powders), through innovative experimental techniques, and/or through the development of novel numerical or hybrid experimental/numerical modelling concepts in geomechanics. Topics of interest include instabilities and localization, interface and surface phenomena, fracture and failure, multi-physics and other time-dependent phenomena, micromechanics and multi-scale methods, and inverse analysis and stochastic methods. Papers related to energy and environmental issues are particularly welcome. The illustration of the proposed methods and techniques to engineering problems is encouraged. However, manuscripts dealing with applications of existing methods, or proposing incremental improvements to existing methods – in particular marginal extensions of existing analytical solutions or numerical methods – will not be considered for review.
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