An analytical solution for the consolidation of a composite foundation reinforced by vertical drains and high replacement ratio gravel piles by considering the radial flow within gravel piles

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-10-24 DOI:10.1016/j.sandf.2023.101393
Chuanxun Li, Xiangzong Lu, Peng Wang
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Abstract

To make up for the shortcomings of single-pile composite foundations, combined composite foundations are increasingly used in engineering. However, studies for the consolidation theory of composite foundations reinforced by high replacement ratio gravel piles and vertical drains, in which the radial flow within gravel piles is considered, have been rarely reported in the literature. The establishment of a comprehensive composite foundation consolidation model is of significance for more reasonable design for stone columns and vertical drains, such as penetration depth, replacement ratio, distribution pattern and so on. Therefore, to solve such consolidation issues, a gravel pile-soil unit with several vertical drains around the perimeter is regarded as a calculation model. Then, the related analytical solution to the total average express pore water pressure (EPWP) is derived by considering the radial flow within gravel piles, and the reliability is verified by comparison with existing solutions. Moreover, extensive calculations are made to investigate the consolidation behaviors, and the results show that vertical flow in soils has little effect on the consolidation of this composite foundation; the effect of radial flow within high replacement ratio gravel piles is nonnegligible; installing vertical drains between piles can enhance the consolidation rate. Finally, the model is applied to the settlement calculation of an embankment in Malaysia, and the results by proposed solutions are in good agreement with the measured data, further indicating the applicability of the calculated model.

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考虑碎石桩内部径向流动的垂直排水-高置换比碎石桩复合地基固结解析解
为了弥补单桩复合地基的不足,工程上越来越多地采用组合复合地基。然而,考虑碎石桩内径向流动的高置换比碎石桩与竖向排水复合地基固结理论研究却鲜有文献报道。综合复合地基固结模型的建立,对于石柱和竖向排水的贯深、置换比、分布格局等设计更为合理具有重要意义。因此,为了解决这类固结问题,我们将周长有几个垂直排水管的砾石桩-土单元作为计算模型。在此基础上,推导了考虑碎石桩内部径向流动的总平均孔隙水压力(EPWP)的解析解,并与已有解进行了对比,验证了其可靠性。此外,对复合地基的固结行为进行了大量的计算研究,结果表明:竖向流动对复合地基的固结影响较小;高置换比碎石桩内径向流的影响不可忽视;在桩间设置垂直排水沟,可以提高固结率。最后,将该模型应用于马来西亚某路堤的沉降计算,计算结果与实测数据吻合较好,进一步证明了计算模型的适用性。
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来源期刊
Soils and Foundations
Soils and Foundations 工程技术-地球科学综合
CiteScore
6.40
自引率
8.10%
发文量
99
审稿时长
5 months
期刊介绍: Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.
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