Mechanical behavior of clayey methane hydrate-bearing sediment: Effects of pore size and physicochemical characteristics using a novel DEM contact model

IF 5.3 1区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS
Xudong Zhang , Mingjing Jiang , Zhenyu Yin , An Zhang
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引用次数: 0

Abstract

The mechanical behavior of Methane Hydrate-Bearing Sediment (MHBS) is essential for the safe exploitation of Methane Hydrate (MH). In particular, the pore size and physicochemical characteristics of MHBS significantly influence its mechanical behavior, especially in clayey grain-cementing type MHBS. This study employs the Distinct Element Method (DEM) to investigate both the macroscopic and microscopic mechanical behavior of clayey grain-cementing type MHBS, focusing on variations in pore size and physicochemical characteristics. To accomplish this, we propose a Thermo-Hydro-Mechanical-Chemical-Soil Characteristics (THMCS) DEM contact model that incorporates the effects of pore size and physicochemical characteristics on the strength and modulus of MH. This THMCS model is validated using experimental data available in the literature. Using the proposed contact model, we conducted a series of investigations to explore the mechanical behavior of MHBS under conventional loading paths, including isotropic and drained triaxial tests using the DEM. The numerical results indicate that smaller pore sizes and lower water content—key physicochemical characteristics resulting from variations in electrochemical properties and the intensity of the electric field—can lead to reduced shear strength and stiffness due to the increased breakage of aggregates and weakened cementation. Additionally, heating was found to further accelerate the process of structural damage in MHBS.
含甲烷水合物黏性沉积物的力学行为:基于新型DEM接触模型的孔隙大小和物理化学特征的影响
含甲烷水合物沉积物的力学行为对甲烷水合物的安全开采至关重要。特别是,MHBS的孔隙大小和理化特性对其力学行为有显著影响,尤其是粘粒胶结型MHBS。本研究采用离散元法(DEM)研究黏性颗粒胶结型MHBS的宏观和微观力学行为,重点研究孔隙大小和物理化学特征的变化。为了实现这一目标,我们提出了一个热-水-机械-化学-土壤特征(THMCS) DEM接触模型,该模型包含了孔隙大小和物理化学特征对MH强度和模量的影响。该THMCS模型使用文献中的实验数据进行了验证。利用所提出的接触模型,我们进行了一系列研究,以探索MHBS在常规加载路径下的力学行为,包括各向同性和排水三轴试验。数值结果表明,较小的孔隙尺寸和较低的含水量是电化学性质和电场强度变化导致的关键物理化学特征,这可能导致剪切强度和刚度降低,这是由于聚集体破碎增加和胶结减弱造成的。此外,研究发现加热会进一步加速MHBS的结构损伤过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Computers and Geotechnics
Computers and Geotechnics 地学-地球科学综合
CiteScore
9.10
自引率
15.10%
发文量
438
审稿时长
45 days
期刊介绍: The use of computers is firmly established in geotechnical engineering and continues to grow rapidly in both engineering practice and academe. The development of advanced numerical techniques and constitutive modeling, in conjunction with rapid developments in computer hardware, enables problems to be tackled that were unthinkable even a few years ago. Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics. Contributions on advances in numerical algorithms, computer implementation of new constitutive models and probabilistic methods are especially encouraged.
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