Model Test Study on Bearing Characteristics of Pile Foundation in Red Clay

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Hangyu Yan, Jinbin Long, Yuanhao Yang, Qingye Shi, Bai Yang
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Abstract

The physical and mechanical properties of red clay have a significant influence on the bearing characteristics of pile foundations. Therefore, this paper conducted model tests to study the influence of different red clay water content (16~−20%) and different compaction degrees (88~−92%) on the bearing characteristics of pile foundations. The results show that the load–displacement curves of the test pile generally exhibit a steep type. The ultimate bearing capacity of the test pile increases gradually with the compaction degree from 86% to 92%. However, the ratio of load borne by the side of the pile increases from 54.8% to 67.8%, while the ratio of load borne by the end decreases from 45.2% to 32.2%. The ratio of load borne by the pile end to that borne by the pile side also decreases gradually from 0.825 to 0.476. The ultimate bearing capacity of the test pile decreases gradually with the moisture content from 17% to 26%, showing a decreasing trend. However, the ratio of load borne by the pile side decreases from 69.5% to 51.9%, while the ratio of load borne by the end increases from 30.5% to 48.1%. The ratio of load borne by the pile end to that borne by the pile side also increases gradually from 0.439 to 0.927. This indicates that increasing the compaction degree or reducing the moisture content has a more significant effect on increasing the side resistance. In this paper, the ultimate bearing capacity of test piles are calculated by the Mohr–Coulomb criterion (M-CC) and Duncan–Chang hyperbolic model (D-CHM), respectively. The results show that M-CC and D-CHM methods can accurately calculate the bearing capacity of the pile foundation in red clay. The conclusion of this study can provide a reference for the design and construction of pile foundations in red clay areas.
红粘土中桩基承载特性的模型试验研究
红粘土的物理力学性质对桩基的承载特性有重要影响。因此,本文进行了模型试验,研究不同红粘土含水量(16~-20%)和不同压实度(88~-92%)对桩基承载特性的影响。结果表明,试桩的荷载-位移曲线一般呈陡峭型。试验桩的极限承载力随着压实度从 86% 到 92% 的增加而逐渐增大。但是,桩侧承受荷载的比率从 54.8% 增加到 67.8%,而桩端承受荷载的比率则从 45.2% 下降到 32.2%。桩端承受的荷载与桩侧承受的荷载之比也从 0.825 逐渐减小到 0.476。试桩的极限承载力随含水量从 17% 到 26% 逐渐降低,呈下降趋势。然而,桩侧承受荷载的比率从 69.5%下降到 51.9%,而桩端承受荷载的比率则从 30.5%上升到 48.1%。桩端承受的荷载与桩侧承受的荷载之比也从 0.439 逐渐增加到 0.927。这表明提高压实度或降低含水量对增加侧阻力有更显著的作用。本文分别采用莫尔-库仑准则(M-CC)和邓肯-张双曲线模型(D-CHM)计算试验桩的极限承载力。结果表明,M-CC 和 D-CHM 方法可以准确计算红粘土中桩基的承载力。本研究的结论可为红粘土地区的桩基设计和施工提供参考。
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
CiteScore
7.20
自引率
4.30%
发文量
567
期刊介绍: ACS Applied Electronic Materials is an interdisciplinary journal publishing original research covering all aspects of electronic materials. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrate knowledge in the areas of materials science, engineering, optics, physics, and chemistry into important applications of electronic materials. Sample research topics that span the journal's scope are inorganic, organic, ionic and polymeric materials with properties that include conducting, semiconducting, superconducting, insulating, dielectric, magnetic, optoelectronic, piezoelectric, ferroelectric and thermoelectric. Indexed/​Abstracted: Web of Science SCIE Scopus CAS INSPEC Portico
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