Superposition-based concurrent multiscale approaches for porodynamics

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-08-09 DOI:10.1002/nag.3813
Wei Sun, Jian-Min Zhang, Jacob Fish, Rui Wang
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Abstract

The current study presents superposition-based concurrent multiscale approaches for porodynamics, capable of capturing related physical phenomena, such as soil liquefaction and dynamic hydraulic fracture branching, across different spatial length scales. Two scenarios are considered: superposition of finite element discretizations with varying mesh densities, and superposition of peridynamics (PD) and finite element method (FEM) to handle discontinuities like strain localization and cracks. The approach decomposes the acceleration and the rate of change in pore water pressure into subdomain solutions approximated by different models, allowing high-fidelity models to be used locally in regions of interest, such as crack tips or shear bands, without neglecting the far-field influence represented by low-fidelity models. The coupled stiffness, mass, compressibility, permeability, and damping matrices were derived based on the superposition-based current multiscale framework. The proposed FEM-FEM porodynamic coupling approach was validated against analytical or numerical solutions for one- and two-dimensional dynamic consolidation problems. The PD-FEM porodynamic coupling model was applied to scenarios like soil liquefaction-induced shear strain accumulation near a low-permeability interlayer in a layered deposit and dynamic hydraulic fracturing branching. It has been shown that the coupled porodynamic model offers modeling flexibility and efficiency by taking advantage of FEM in modeling complex domains and the PD ability to resolve discontinuities.

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基于叠加的并行多尺度孔动力学方法
目前的研究提出了基于叠加的多尺度并发孔隙动力学方法,能够捕捉不同空间长度尺度上的相关物理现象,如土壤液化和动态水力断裂分支。研究考虑了两种情况:不同网格密度的有限元离散的叠加,以及周动力学(PD)和有限元法(FEM)的叠加,以处理应变局部化和裂缝等不连续性问题。该方法将加速度和孔隙水压力的变化率分解为由不同模型近似的子域解,允许在裂缝尖端或剪切带等相关区域局部使用高保真模型,而不忽略低保真模型所代表的远场影响。耦合刚度、质量、可压缩性、渗透性和阻尼矩阵是根据基于叠加的当前多尺度框架推导出来的。针对一维和二维动态固结问题,提出的 FEM-FEM 孔隙动力学耦合方法与分析或数值解决方案进行了验证。将 PD-FEM 孔隙动力学耦合模型应用于层状沉积中低渗透性夹层附近土壤液化诱发的剪切应变累积以及动态水力压裂分支等情况。结果表明,通过利用有限元在复杂域建模方面的优势和 PD 解决不连续性的能力,耦合孔动力学模型提供了建模的灵活性和效率。
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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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