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首页> 外文学位 >Development of modified p-y curves for Winkler Analysis to characterize the lateral load behavior of a single pile embedded in improved soft clay.
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Development of modified p-y curves for Winkler Analysis to characterize the lateral load behavior of a single pile embedded in improved soft clay.

机译：开发用于Winkler分析的修改后的p-y曲线，以表征嵌在改良软土中的单桩的侧向荷载行为。

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摘要

In the past decades, the behavior of pile foundations in liquefiable sands has been studied extensively; however, similar investigations of soft clays or static/seismic response of piles in improved soft clay soils are scarce. Despite the widespread presence of this soil type in high seismic regions and the frequent need to locate bridges and buildings in soft clay, only a few investigations have been carried out to guide engineers in evaluating the effectiveness of ground improvement techniques on increasing the lateral resistance of pile foundation embedded in soft clay, and no numerical models have been validated to evaluate this approach. Thus, the objective of this research was to develop modified p-y curves for Winkler analysis to characterize the lateral load behavior of a single pile embedded in a volume of improved clay surrounded by unimproved soft clays.;A detailed literature review was completed in the study, aiming to gain knowledge on the development and fields of applications together with limitations of different ground improvement techniques. The ability of each available analysis method for lateral loaded piles was assessed for determining lateral responses of pile foundation in a volume of improved soil surrounded by unimproved soil.;A method of developing p-y curve modification factors to account for the effect of the improved soil on enhancing the lateral load behavior of a single pile embedded in soft clay was developed by integrating the effectiveness of the improved soil into the procedures of constructing p-y curves for stiff clay recommended by Welch and Reese (1972). It was achieved by estimating the effective length for a infinitely long soil layer with soil improvement so that the fraction of the load resisted by the soil improved over a limited horizontal extent could be accounted for by taking the ratio between the soil resistance attenuation at actual length of the soil improvement and the effective length. The accuracy of the method was verified against the centrifuge test data from Liu et al. (2010) and the full scale field test from Fleming et al. (2010). The verifications using experimental data demonstrated that the Winkler analysis with proposed p-y modification factors is able to capture the full range of elastic and inelastic pile responses with slopes that correspond well with the results obtained from both centrifuge and field testing, the effectiveness of the soil improvement can be adequately evaluated.;In addition, an analytical study on the effectiveness of the cement-deep-soil-mixing (CDSM) ground improvement technique on controlling the lateral displacement of pile foundations embedded in different clay soil conditions with and without ground improvement was carried out. A set of lateral load analyses was performed to establish permissible displacements for precast, prestressed concrete piles as well as open-ended steel pipe pile prior to reaching the curvature capacity of piles. The analysis results showed an average of 66% reduction on the permissible displacement limit by providing a volume of CDSM soil improvement around the prestressed precast concrete piles embedded in medium clay and soft clay. And an average of 79% reduction was observed on steel pipe pile embedded in CDSM improved medium clay and soft clay.
机译：在过去的几十年中，对桩基在液化沙子中的行为进行了广泛的研究。然而，在改良的软土中，对软土或桩的静/地震响应的类似研究很少。尽管这种土壤类型在高地震地区普遍存在，并且经常需要在软粘土中定位桥梁和建筑物，但仅进行了少量研究以指导工程师评估地面改良技术在增加地基横向阻力方面的有效性。桩基嵌在软黏土中，没有数值模型可以验证这种方法。因此，本研究的目的是为Winkler分析开发修改后的py曲线，以表征嵌在一定体积的未改良软土包围的改良粘土中的单桩的侧向荷载行为。旨在获得有关应用开发和领域的知识以及不同地面改良技术的局限性。评估了每种可用的横向加载桩分析方法的能力，以确定在未改良土壤包围的改良土壤中桩基础的横向响应。;开发py曲线修正因子以说明改良土壤对桩基的影响的方法。通过将改良土壤的有效性整合到Welch和Reese（1972）建议的为硬质粘土构造py曲线的过程中，开发出了一种增强埋入软粘土中单桩侧向荷载性能的方法。通过估算无限长的土壤层的有效长度并进行土壤改良，可以达到这一目的，从而可以通过考虑实际长度下的土壤阻力衰减量之比来计算在有限的水平范围内土壤改良的抵抗荷载的比例。土壤改良剂和有效长度。根据Liu等人的离心测试数据验证了该方法的准确性。 （2010年）和Fleming等人的全面现场测试。 （2010）。使用实验数据进行的验证表明，采用建议的py修正因子的Winkler分析能够捕获具有与离心机和野外试验获得的结果非常吻合的坡度的全部弹性和非弹性桩响应，土壤改良的有效性此外，对水泥深层搅拌（CDSM）地面改良技术在控制和不进行地面改良的情况下控制埋在不同粘土条件下的桩基础的横向位移的有效性进行了分析研究。执行。进行了一组侧向荷载分析，以建立预制，预应力混凝土桩以及端部钢管桩的允许位移，然后达到桩的曲率容量。分析结果表明，通过在中等黏土和软黏土中埋置的预应力预制混凝土桩周围提供一定数量的CDSM改良土壤，可将允许位移极限平均降低66％。在CDSM改良的中粘土和软粘土中埋入的钢管桩平均减少了79％。

著录项

  • 作者

    Huang, Jin-Wei.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Engineering Civil.
  • 学位 M.S.
  • 年度 2011
  • 页码 149 p.
  • 总页数 149
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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