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Estimating hydraulic properties of unsaturated compacted cohesive soils from basic geotechnical soil properties.

机译：从基本的岩土土壤特性估算不饱和压实粘性土壤的水力特性。

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摘要

This study was performed to develop predictive models to estimate the hydraulic soil properties of unsaturated compacted cohesive soils that are typically used in landfill final covers and liners, and other waste impoundments. This model will facilitate the implementation of unsaturated soil mechanics in routine geotechnical and geoenvironmental engineering applications such as the design and performance evaluation of components of landfills, or any other earthen structures where subsurface flow is of concern.;Regression analysis was performed on soil data obtained from the literature to establish predictive models that estimate the soil water characteristic curve (SWCC) for compacted cohesive soil. The study considered most of the parameters that have been demonstrated to affect the shape and position of the SWCC for both compacted and non compacted soil The proposed models were established for the fitting parameters of the Van Genuchten (1980) equation. Based on the analysis the author concluded that the compaction conditions (remolding moisture and density) were not the primary factors that affect the soil water retention properties represented by the SWCC. The possibility of extending the proposed models to natural non compacted soil was investigated. Soil data for non compacted soil available in the literature was used for this investigation. The author concluded that the proposed model could be used equally for cohesive compacted and non compacted soils.;The performance of the proposed models was compared with two models proposed by other researchers for compacted soil, and with one proposed model for non compacted soil. The current proposed models significantly outperformed the three referenced models. Given basic geotechnical soil properties (specific gravity, Atterberg limits, and grain size distribution data) the current proposed predictive models can be used to estimate the SWCC for compacted and non compacted soil.
机译：进行这项研究是为了开发预测模型，以估算通常用于垃圾填埋场最终覆盖层和衬砌以及其他废物蓄积的不饱和压实粘性土壤的水硬性。该模型将有助于在常规的岩土和地球环境工程应用中实施非饱和土力学，例如垃圾掩埋场或与地下流动有关的其他土结构的设计和性能评估;对获得的土壤数据进行回归分析。从文献中建立预测模型，以估算压实粘性土壤的土壤水分特征曲线（SWCC）。该研究考虑了已被证明影响压实土和非压实土的SWCC形状和位置的大多数参数。为Van Genuchten（1980）方程的拟合参数建立了建议的模型。根据分析，作者得出结论，压实条件（重塑水分和密度）不是影响SWCC代表的土壤保水性的主要因素。研究了将建议的模型扩展到天然非压实土壤的可能性。文献中可获得的非压实土壤的土壤数据用于该研究。作者得出的结论是，所提出的模型可以同等地用于粘性压实土和非压实土中。将所提出的模型的性能与其他研究人员针对压实土提出的两种模型和针对非压实土提出的一种模型进行了比较。当前提出的模型明显优于三个参考模型。给定基本的岩土土壤属性（比重，阿特伯格极限和粒度分布数据），当前建议的预测模型可用于估算压实和非压实土壤的SWCC。

著录项

  • 作者

    Gharagheer, Fawzi Suleiman Thaher.;

  • 作者单位

    The University of Toledo.;

  • 授予单位 The University of Toledo.;
  • 学科 Geotechnology.;Engineering Environmental.;Engineering Civil.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 174 p.
  • 总页数 174
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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