Dynamic Response of GESCs-Supported Embankments in Sand Under Sinusoidal Loading: A Fluid-Solid Coupling Method

IF 3.6 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-08-29 DOI:10.1002/nag.70055

Ling Zhang, Xiaocong Cai, Zijian Yang

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Abstract

The geosynthetic-encased stone columns (GESCs) are extensively used for improving weak foundations. Three-dimensional numerical models with a fluid-solid coupling method are established to delve into the dynamic response of GESCs-supported embankment in sand under sinusoidal loading. Further, loading frequency (f), loading amplitude (a_m), embankment loads (σ_e), space-to-diameter ratio (s/D), column length-to-foundation thickness ratio (L/H), and Young's modulus of soil (E_s), are selected to conduct the parametric study. Numerical results indicate that encasement guarantees the anti-liquefaction of GESCs compared to OSCs and untreated foundations. However, the soil outside of the GESCs reinforcement region results in the absolute value of the excess pore water pressure ratio (R_u) larger than 1.0. The sand foundations develop slip surfaces under embankment and sinusoidal loads based on maximum lateral displacement and their positions. GESCs are more sensitive to lower f and higher a_m. It is recommended to consider the σ_e in the dynamic analysis process. A larger L/H or E_s/E_c (E_c = Young's modulus of column) or smaller s/D is conducive to the dynamic resistance of GESCs.

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正弦载荷下GESCs支撑砂土路堤的动力响应：一种流固耦合方法

土工合成包裹石柱（GESCs）广泛用于改善薄弱的基础。采用流固耦合方法建立了三维数值模型，研究了正弦荷载作用下GESCs支撑砂土路基的动力响应。选取加载频率(f)、加载幅值（am）、路堤荷载（σe）、空间直径比（s/D）、柱长与地基厚度比（L/H）和土体杨氏模量（Es）进行参数化研究。数值结果表明，与osc和未经处理的基础相比，包裹可以保证GESCs的抗液化。而GESCs加固区外土体的超孔隙水压力比（Ru）绝对值大于1.0。砂基在路堤荷载和正弦荷载作用下，根据最大侧向位移及其位置产生滑移面。GESCs对较低的f和较高的am更为敏感。建议在动态分析过程中考虑σe。较大的L/H或Es/Ec （Ec =柱的杨氏模量）或较小的s/D有利于提高GESCs的动力抗力。

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来源期刊

International Journal for Numerical and Analytical Methods in Geomechanics 工程技术-材料科学：综合

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.