无粘性土中长阶梯锥桩和直桩侧阻力的创新FE-AI模型

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2025-08-30 DOI:10.1016/j.trgeo.2025.101700

Ahmed Elsawwaf, Hany El Naggar, Farrukh A. Choksi, Habib Amin

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引用次数: 0

摘要

台阶锥度桩是大直径桩的一种经济有效的替代方案，可用于支持受侧向力较大的交通基础设施。然而，文献目前缺乏一种直接的方法来估计这些专用桩的横向承载力。本研究旨在为设计人员提供实用、可靠的无黏性土中长阶锥桩侧承载力预测模型。为此，进行了全面的三维有限元（FE）分析，以研究影响长阶锥桩性能的参数，并生成适合进化多项式回归（EPR）建模的广泛数据库。有限元分析结果表明，阶梯锥度桩的优化设计是根据表观塑性铰的深度，即最大弯矩的位置，在一定长度上扩大截面。基于870个实例的参数化研究，采用基于多目标遗传算法的进化多项式回归（EPR-MOGA）方法，建立了直桩和阶梯锥度桩的鲁棒预测模型。所提出的模型纳入了与桩的几何形状、弯曲刚度和土在侧向荷载下的复杂行为有关的因素。通过对直桩的现场实测和阶梯锥桩的有限元结果验证了其有效性。

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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Innovative FE-AI modelling of lateral resistance of long step-tapered and straight piles in cohesionless soils

Step-tapered piles provide a cost-effective alternative to large-diameter piles for supporting transportation infrastructure subjected to significant lateral forces. However, the literature currently lacks a straightforward method for estimating the lateral bearing capacity of these specialized piles. The present study aims to equip designers with practical and reliable predictive models for the lateral capacity of long step-tapered piles in cohesionless soils. To this end, a comprehensive 3D finite element (FE) analysis was conducted to investigate the parameters influencing the performance of long step-tapered piles and to generate an extensive database suitable for evolutionary polynomial regression (EPR) modelling. The FE results indicated that the optimal design of step-tapered piles involves enlarging the cross-section over a length (

L_{emb}

) corresponding to the depth of the apparent plastic hinge, i.e., the location of the maximum bending moment. Based on the parametric study encompassing 870 cases, two robust predictive models were developed, one for straight piles and one for step-tapered piles, using multi-objective genetic algorithm-based evolutionary polynomial regression (EPR-MOGA). The proposed models incorporate factors related to pile geometry, bending stiffness, and the complex behaviour of soil under lateral loading. Their effectiveness was validated against field measurements for straight piles and FE results for step-tapered piles.

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来源期刊

Transportation Geotechnics Social Sciences-Transportation

CiteScore

8.10

自引率

11.30%

发文量

194

审稿时长

51 days

期刊介绍： Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.