Behavior of model pile in unsaturated soil subjected to cyclic loading

IF 5.6 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Hijran Aljanabi, Reza Imam, Mohammad Khorand
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Abstract

Most previous experimental studies on the behavior of piles subjected to lateral loading have focused on testing model piles embedded in dry or fully saturated soils, and little attention has been paid to the impact of the soil partial saturation on the results. This paper presents results of 1g model tests on a single pile embedded in dry and unsaturated sand subjected to two-way constant displacement amplitude loading. The tests were aimed at examination of the effects of degree of soil saturation and density on the pile internal forces and lateral capacity and the deformation patterns of the adjacent soils. Five degrees of saturation (Sr = 0, 10, 20, 35 and 50%) for loose and medium-dense sand (Dr = 20% and 50%) were chosen and a 65-mm-diameter and 900-mm-long polyethylene model pile was used. Test results indicated that at each soil relative density, the pile head horizontal load, and the maximum bending moment, shear force, and soil reaction in the pile increase with increase in the degree of saturation up to about Sr = 35%. However, further increase in Sr led to decrease in these values. Moreover, the cyclic loading led to depressions in the surface of the dry sand and bulging associated with soil–pile separation in the unsaturated sand. For the model testing conditions used, results indicated that the sand degree of saturation can have a greater impact on the pile behavior than its density.

Abstract Image

非饱和土壤中的模型桩在循环荷载作用下的行为
以往对承受横向荷载的桩的行为进行的实验研究大多集中在测试嵌入干燥或完全饱和土壤中的模型桩,很少关注土壤部分饱和度对结果的影响。本文介绍了在双向恒定位移振幅荷载作用下,对嵌入干燥和非饱和砂土中的单桩进行 1g 模型试验的结果。试验旨在检验土壤饱和度和密度对桩内力和侧向承载力的影响,以及邻近土壤的变形模式。试验选择了松散砂土和中等密度砂土(Dr = 20% 和 50% )的五种饱和度(Sr = 0、10、20、35 和 50% ),并使用了直径 65 毫米、长 900 毫米的聚乙烯模型桩。试验结果表明,在每种土壤相对密度下,随着饱和度的增加,桩头水平荷载、最大弯矩、剪力和桩内土壤反力都会增加,最高可达 Sr = 35%。然而,Sr 的进一步增加会导致这些值的下降。此外,循环加载导致干砂表面凹陷,以及非饱和砂中与土桩分离相关的隆起。对于所使用的模型试验条件,结果表明砂的饱和度比密度对桩的行为影响更大。
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来源期刊
Acta Geotechnica
Acta Geotechnica ENGINEERING, GEOLOGICAL-
CiteScore
9.90
自引率
17.50%
发文量
297
审稿时长
4 months
期刊介绍: Acta Geotechnica is an international journal devoted to the publication and dissemination of basic and applied research in geoengineering – an interdisciplinary field dealing with geomaterials such as soils and rocks. Coverage emphasizes the interplay between geomechanical models and their engineering applications. The journal presents original research papers on fundamental concepts in geomechanics and their novel applications in geoengineering based on experimental, analytical and/or numerical approaches. The main purpose of the journal is to foster understanding of the fundamental mechanisms behind the phenomena and processes in geomaterials, from kilometer-scale problems as they occur in geoscience, and down to the nano-scale, with their potential impact on geoengineering. The journal strives to report and archive progress in the field in a timely manner, presenting research papers, review articles, short notes and letters to the editors.
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