A frictional arch model for pile-cap-beam-supported embankment

IF 4.9 2区工程技术 Q1 ENGINEERING, CIVIL

Transportation Geotechnics Pub Date : 2024-10-15 DOI:10.1016/j.trgeo.2024.101403

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引用次数: 0

Abstract

The pile-cap-beam-supported (PCBS) system can strength the soil arching effect of embankment, increase the lateral stiffness, bending resistance and vertical bearing capacity of the rigid pile, however there is no frictional soil arch model of PCBS embankment. In this paper, first a frictional arch model for PCBS embankment modified from Russell’s frictional arching model was proposed. The proposed model in this paper considers the algorithm of lateral pressure coefficient k and a changing critical height of soil arch. In this new method, the influence of pile spacing, filling properties, height and pile spacing on critical height soil arch was comprehensively considered. Second, a series of numerical cases were performed to verify the effectiveness of the proposed model and study the arching effect of PCBS embankment. By comparing the vertical stress and settlement between the theoretical and simulation results, the rationality of the proposed method to estimate the stress and critical height of arch was validated. The effectiveness of the proposed method was further validated by comparing loading efficacy to a reported case. Last, the stress and deformation of PCBS and pile-cap-supported (PCS) embankment were analyzed and the superiority of PCBS system in improving the performance of embankment was observed finally.

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桩帽-梁支撑路堤的摩擦拱模型

桩帽-梁支撑（PCBS）系统可以增强路堤的土拱效应，提高刚性桩的侧向刚度、抗弯强度和竖向承载力，但目前还没有 PCBS 路堤的摩擦土拱模型。本文首先在 Russell 摩擦起拱模型的基础上提出了 PCBS 路堤摩擦起拱模型。本文提出的模型考虑了侧压力系数 k 和土拱临界高度变化的算法。在这种新方法中，全面考虑了桩距、填土性质、高度和桩距对临界高度土拱的影响。其次，为了验证所提模型的有效性，并研究 PCBS 路堤的起拱效应，进行了一系列数值计算。通过比较理论和模拟结果之间的垂直应力和沉降，验证了所提方法估算拱应力和临界高度的合理性。通过将加载效果与报告案例进行对比，进一步验证了所提方法的有效性。最后，分析了 PCBS 和桩帽支撑（PCS）路堤的应力和变形，并最终观察到 PCBS 系统在改善路堤性能方面的优越性。

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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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.