Analytical Solutions for Consolidation of Soft Ground With Impervious Columns Considering Non‐Darcian Flow

IF 3.4 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL International Journal for Numerical and Analytical Methods in Geomechanics Pub Date : 2024-10-08 DOI:10.1002/nag.3857
Kuo Li, Mengmeng Lu, Jinxin Sun
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Abstract

Cohesive material columns have been extensively used in foundation improvement projects to enhance the bearing capacity of composite foundations and mitigate post‐construction settlement. However, the low permeability of cohesive material columns restricts the dissipation of pore water primarily through the top surface of the foundation, potentially resulting in longer drainage paths compared to foundations treated with granular material columns or vertical drains. Moreover, the impact of non‐Darcian flow within soils on consolidation behavior becomes increasingly pronounced as the drainage path increases. Consequently, a novel analytical model for the consolidation of impervious column‐assisted foundations is established, which can incorporate the seepage model accounting for the initial hydraulic gradient. The accuracy and reasonableness of the obtained solution are then validated by conducting a comparative analysis with existing models and through a detailed case study. Furthermore, a parametric analysis is conducted to delve into the influence of several crucial factors on the consolidation performance. The findings demonstrate that non‐Darcian flow has a greater influence on composite foundations compared to natural foundations. Additionally, the threshold value of the well‐diameter ratio decreases with the increase in the initial hydraulic gradient. Finally, the final seepage front remains at a shallower position when the column–soil modulus ratio becomes larger, and the influence of non‐Darcian flow on the consolidation rate becomes more pronounced.
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考虑到非达西流的软土地基不透水柱固结的分析解决方案
粘性材料柱已被广泛应用于地基改良项目中,以提高复合地基的承载能力并减轻施工后的沉降。然而,粘性材料柱的低渗透性限制了孔隙水主要通过地基顶面消散,与使用粒状材料柱或垂直排水沟处理的地基相比,粘性材料柱可能会导致更长的排水路径。此外,随着排水路径的增加,土壤中的非达西流对固结行为的影响也会越来越明显。因此,针对不透水柱辅助地基的固结问题建立了一个新的分析模型,该模型可结合考虑初始水力坡度的渗流模型。然后,通过与现有模型的对比分析和详细的案例研究,验证了所获得解决方案的准确性和合理性。此外,还进行了参数分析,以深入研究几个关键因素对固结性能的影响。研究结果表明,与天然地基相比,非达西流对复合地基的影响更大。此外,井径比的临界值随着初始水力坡度的增加而减小。最后,柱土模量比越大,最终渗流前沿的位置越浅,非达西流对固结速率的影响越明显。
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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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