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Design of drilled shaft and tied-back retaining walls in high plasticity clays.

机译：高塑性粘土中钻孔竖井和后绑式挡土墙的设计。

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摘要

The current design procedure adopted by Texas Department of Transportation for designing simple cut type retaining walls such as Tied-back, Drilled shaft and Soil nail is based on the lateral pressure calculated from the classical Rankine's or Coulomb's methods considering drained shear strength parameters and it does not include any lateral pressure due to swelling of the expansive soil as a result of change in moisture content. The lateral pressure due to the expansion of soil, as predicted by the consultants is 10 to 20 times higher than the normal lateral pressure on the walls, which resulted in increase in the thickness of the walls in order to accommodate such large pressures due to expansion, without knowing the actual pressure pattern due to expansion.;The focus of this study is to provide TxDOT in particular and the field of geotechnical engineering in general, the guidelines and charts for the design of cut-type retaining walls in high plasticity clay considering the pressure due to swelling of soil and moreover provide a profile of change in water content of soil with time for a site in San Antonio, Texas (intersection of Walter's Street and I-35).;This study includes three major parts: 1. Measurement of variation of moisture content with time. 2. Laboratory testing on the undisturbed expansive soil samples (conducted by Texas A&M University in College Station) and 3. Coupled finite element modeling (FEM) of retaining structures in expansive soil, with varying suction and loading using commercially available software (SV Office and Geo-Studio).;The findings from this study can be summarized as: 1. Wetting envelope for high plasticity soil located at the intersection of I-35 and Walters Street in San Antonio, Texas. 2. Relation between water content and pore-water pressure (i.e., Soil Water Characteristic Curve), for the site located at the intersection of I-35 and Walters Street in San Antonio, Texas. 3. Horizontal pressure patterns due to swelling of high plasticity clays, on the drilled shaft and tie-back retaining structures. 4. Guidelines for the design of retaining structures in high plasticity clays.
机译：德州交通运输部当前采用的设计程序，是用于设计简单的切割型挡土墙，例如绑扎，钻孔的竖井和土钉子，是基于考虑到排水抗剪强度参数的经典兰金法或库仑法计算的侧向压力，不包括由于水分含量变化而导致的膨胀土壤膨胀而产生的任何侧向压力。顾问预测，由于土壤膨胀而产生的侧向压力要比壁上的正常侧向压力高10至20倍，这导致壁厚增加，以适应因膨胀而产生的巨大压力；本研究的重点是特别提供TxDOT以及一般的岩土工程领域，同时考虑到高塑性粘土中的切口型挡土墙的设计准则和图表得益于土壤膨胀的压力，此外，得克萨斯州圣安东尼奥（Walter's Street和I-35的交汇处）的一个地点的土壤水分含量随时间的变化情况;该研究包括三个主要部分：1。测量水分含量随时间的变化。 2.在未经扰动的膨胀土样品上进行实验室测试（由College Station的Texas A＆M大学进行），并且3.使用市售软件（SV Office和SV Office，使用可变的吸力和载荷，对膨胀土中的固位结构进行有限元建模（FEM））。 Geo-Studio）；该研究的结果可以概括为：1.位于德克萨斯州圣安东尼奥市I-35和Walters Street交汇处的高塑性土壤的湿润包膜。 2.对于位于德克萨斯州圣安东尼奥市I-35和Walters Street交汇处的场地，水分含量与孔隙水压力之间的关系（即土壤水分特征曲线）。 3.在钻孔的轴和后帮固定结构上，由于高塑性粘土膨胀而产生的水平压力分布。 4.高塑性粘土中挡土结构设计指南。

著录项

  • 作者

    Ahmed, Mirza Nomaan.;

  • 作者单位

    The University of Texas at San Antonio.;

  • 授予单位 The University of Texas at San Antonio.;
  • 学科 Engineering Geological.;Engineering Civil.
  • 学位 M.S.
  • 年度 2010
  • 页码 180 p.
  • 总页数 180
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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