Numerical Investigation on Consolidation Characteristics of Geotextile‐Encased Recycled Aggregate Columns in Soft Soil

IF 3.6 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2025-09-05 DOI:10.1002/nag.70064

Ling Zhang, Xiaocong Cai, Jingpeng Tan, Yaqian Shi, Binbing Mao

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Abstract

The drainage and consolidation are important for the bearing capacity and deformation of geotextile‐encased recycled aggregate columns (GERACs) in soft soil. To investigate the consolidation characteristics of GERAC in soft soil, this paper develops a coupled numerical model incorporating the permeability of soft soil, the discreteness of RAs, and column drainage. The drainage process, vertical (vz) and radial (vr) permeable velocity, excess pore water pressure ratio (REPWP), vertical effective stress (σzes), and bulging deformation are methodically analyzed. Furthermore, the effect of eight essential factors on the consolidation characteristics is examined. Simulation results show that an influence boundary of bulging on the PWP and permeable velocity vector is 0.5 times the column length (L) in the depth direction and three times the column diameter (D) in the radial direction. The vr relies on the bulging deformation of the column. The position of maximum bulging deformation changes from a depth of 0 to 0.67D and finally maintains at 0.67D. A slight bulging is observed at deeper positions of 1.50–3.00D. The gradation slightly affects the bulging deformation, but relatively significantly impacts the EPWP and σzes. A L/D of 5–9 and a relative density of not less than 55% is recommended.

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软土中土工织物包覆再生骨料柱固结特性的数值研究

排水和固结对软土中土工布包覆再生骨料柱（GERACs）的承载力和变形具有重要意义。为了研究GERAC在软土中的固结特性，本文建立了考虑软土渗透性、ra离散性和柱排水的耦合数值模型。系统分析了排水过程、纵向（vz）和径向（vr）渗流速度、超孔隙水压力比（REPWP）、纵向有效应力（σzes）和胀形变形。进一步分析了8个基本因素对固结特性的影响。仿真结果表明，胀形对PWP和渗透速度矢量的影响边界在深度方向上是柱长(L)的0.5倍，在径向方向上是柱径(D)的3倍。虚拟现实依赖于柱的胀形变形。从深度0到0.67D，最大胀形变形位置发生变化，最终保持在0.67D。在1.50-3.00D的较深位置观察到轻微的胀形。级配对胀形变形影响较小，但对EPWP和σ值的影响相对较大。建议L/D为5-9，相对密度不低于55%。

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

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.