Resistance responses and design recommendations for driven piles in coarse-grained soil-based intermediate geomaterials

IF 3.3 2区 工程技术 Q2 ENGINEERING, GEOLOGICAL Soils and Foundations Pub Date : 2023-10-30 DOI:10.1016/j.sandf.2023.101381
Nafis Bin Masud , Kam W. Ng , Shaun S. Wulff
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Abstract

Piles driven in Intermediate GeoMaterials (IGM) pose multiple design and construction challenges because of the high uncertainty in IGM properties, lacking knowledge pertaining to pile responses in IGM, and absence of classification, static analysis (SA) methods, and design recommendations. A classification criterion is established for coarse grained soil based intermediate geomaterials (CG-IGM) using test pile data from bridge projects completed in four U.S. states. This study improves our understanding of pile resistance responses in CG-IGM and results in pile design recommendations. Unit shaft resistance (qs) of CG-IGM increases with the ratio of effective vertical stress (σv) to the ratio of corrected N-value, (N1)60. Unit end bearing (qb) increases with the ratio of. corrected N-value, (N1)60 to the effective vertical stress (σv). New SA methods are developed for predicting qs and qb. The proposed SA methods are compared against existing β-method developed for coarse grained soil and validated using an independent pile load test dataset. Pile setup is observed in qs of piles driven in CG-IGMs, and pile relaxation is mostly observed in qb. Statistical assessment concludes that the proposed SA methods provide more accurate and consistent qs and qb predictions than that by the β-method.

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粗粒土基中间岩土材料中打入桩的阻力响应及设计建议
在中间岩土材料(IGM)中打桩,由于IGM特性的高度不确定性,缺乏与IGM中桩的响应相关的知识,以及缺乏分类、静力分析(SA)方法和设计建议,给设计和施工带来了多重挑战。利用美国四个州完成的桥梁项目的试桩数据,建立了粗粒土基中间岩土材料(CG-IGM)的分类标准。这项研究提高了我们对CG-IGM中桩阻力响应的理解,并提出了桩设计建议。随着有效竖向应力σv′与修正n值之比(N1)60的增大,CG-IGM的单位轴阻(qs)逐渐增大。机组端轴承(qb)随比增大而增大。修正后的n值,(N1)60为有效垂直应力(σv′)。提出了新的SA方法来预测qs和qb。将提出的SA方法与现有的用于粗粒土的β-方法进行了比较,并使用独立的桩荷载试验数据集进行了验证。在cg - igm灌注桩中,在qq中观察到桩的建立,在qb中观察到桩的松弛。统计评估表明,与β-方法相比,SA方法提供了更准确和一致的qs和qb预测。
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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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