A novel peridynamic solution for modelling saturated soil-pore fluid interaction in liquefaction analysis
A novel peridynamic solution for modelling saturated soil-pore fluid interaction in liquefaction analysis
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DOI：
10.1016/j.compgeo.2023.105686
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发表时间：
2023-10
影响因子：
5.3
通讯作者：
Q. Gu;Zhe Lin;Lei Wang;Z. Qiu;Surong Huang;Shaofan Li
中科院分区：
文献类型：
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作者：
Q. Gu;Zhe Lin;Lei Wang;Z. Qiu;Surong Huang;Shaofan Li
地震作用下饱和土-孔隙流体相互作用会对重要基础设施系统造成严重破坏。因此，饱和土壤-孔隙流体相互作用及其后果（例如，地震引起的大变形）对于液化分析特别重要。周波法克服了有限元法网格依赖性的缺点，成为解决大变形问题的有效方法。然而，PD还没有扩展到模拟土-孔隙流体相互作用，限制了其在液化分析中的应用。为了弥补这一差距，提出了一种新的解决方案策略来模拟土壤-孔隙流体相互作用（即，本文基于作者及其同事最近提出的混合PD（HPD）法，对饱和砂土液化分析中的两个问题进行了讨论。采用显-显方法求解耦合方程组。通过对水平和倾斜场地上的液化土进行分析，并与试验数据和有限元模拟结果进行比较，验证了该方法的有效性，表明该方法能够有效地求解土-孔隙流体方程，适用于与液化相关的广泛岩土地震工程问题。
Saturated soil-pore fluid interaction under earthquake shaking can cause extensive damages to critical infrastructure systems. As such, accurate modeling of saturated soil-pore fluid interaction and its consequences (e.g., seismically-induced large deformation) are of particular importance for liquefaction analysis. Peridynamics (PD) has emerged as an effective method for solving large deformation problems by overcoming the disadvantage of finite element method caused by mesh dependency. However, the PD has not been extended to model soil-pore fluid interaction, limiting its application in liquefaction analysis. To bridge this gap, a novel solution strategy is presented for modeling soil-pore fluid interaction (i.e., theu-pequations herein) in liquefaction analysis of saturated granular soils, based on a hybrid PD (HPD) method recently proposed by the authors and co-workers. An explicit-explicit method is used to solve the coupledu-pequations. Liquefiable soil on level and sloped ground are analyzed and compared with experimental data and finite element simulations to validate availability and efficiency of the method, demonstrating the method to be effective in solving the soil-pore fluid equations and applicable to a broad range of geotechnical earthquake engineering problems associated with liquefaction.