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Studies on field stabilization methods to prevent surficial slope failures of earthfill dams.

机译：研究防止土石坝表面坡失稳的现场稳定方法。

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摘要

Surficial failures are occurring frequently on the slopes of earthfill dams which are predominantly rainfall induced. Desiccation cracks form on the slope surface during dry environment which accelerates infiltration during rainfall. Infiltration causes increase of pore water pressures and saturation of soil mass in top layer resulting in surficial failures. Numerous surficial failures occurred on the slope of earthfill dams maintained by The United States Army Corps. of Engineers. The current research is undertaken at the University of Texas at Arlington with an objective of exploring the best field stabilization method to mitigate these surficial failures.;Two sites, Joe Pool Dam and Grapevine Dam located in Fort Worth district were selected for the research. The admixtures used to treat the embankment soil were 20% compost, 4% lime with 0.30% polypropylene fibers, 8% lime with 0.15% polypropylene fibers, and 8% lime. These stabilizers were proven to be promising from a laboratory study in mitigating desiccation cracking. Five test sections including four treated sections and one control section were constructed at each dam site. The test sections were instrumented with moisture probes, temperature probes and inclinometers. The moisture content and temperature was recorded for a period of one year at Joe Pool Dam and the data was analyzed using statistical comparison tools. Besides, the vertical movements of the test sections were monitored by conducting elevation surveys and the lateral movements were monitored by conducting periodical inclinometer surveys. Digital image studies were conducted to monitor the desiccation cracking observed in the test sections. Physical model studies were also carried out to study the relative performance of soil treated with admixtures when it was subjected to a number of alternate wetting and drying cycles. Additional laboratory tests were conducted and the data was used to carry out numerical modeling studies using PLAXFLOW and GSTABL7 software programs.;Based on the analysis of the data, the image studies, and the analytical model studies, the 8% lime with 0.15% fibers is found to be the most effective admixture followed by the 8% lime to prevent desiccation cracking and surficial failures of high plasticity clays.
机译：在土坝的斜坡上经常发生表面破坏，这主要是降雨引起的。在干燥环境下，坡面会形成干燥裂纹，从而加速降雨过程中的渗透。渗透导致孔隙水压力增加和顶层土壤质量饱和，导致表面破坏。美国陆军维修的填土坝的斜坡上发生了许多表面故障。工程师。当前的研究是在德克萨斯大学阿灵顿分校进行的，目的是探索减轻这些表层破坏的最佳现场稳定方法。选择两个地点，位于沃思堡区的乔普尔水坝和葡萄藤水坝。用于处理路堤土壤的外加剂是20％的堆肥，4％的石灰和0.30％的聚丙烯纤维，8％的石灰和0.15％的聚丙烯纤维以及8％的石灰。这些稳定剂在减轻干燥裂纹方面的实验室研究中被证明很有希望。每个坝址都建造了五个试验段，包括四个处理段和一个控制段。测试部分装有湿度探头，温度探头和测斜仪。在Joe Pool Dam记录了一年的水分含量和温度，并使用统计比较工具对数据进行了分析。此外，测试部分的垂直运动通过进行仰角测量进行监测，横向运动通过进行定期测斜仪测量进行监视。进行数字图像研究以监测在测试部分中观察到的干燥裂纹。还进行了物理模型研究，以研究掺合料处理过的土壤在经过多个交替的润湿和干燥循环后的相对性能。进行了额外的实验室测试，并使用PLAXFLOW和GSTABL7软件程序将数据用于进行数值建模研究。基于数据分析，图像研究和分析模型研究，使用8％石灰和0.15％纤维被发现是最有效的混合物，其次是8％的石灰，以防止干燥裂纹和高塑性粘土的表面破坏。

著录项

  • 作者

    Dronamraju, Venkata Subrahmanyam.;

  • 作者单位

    The University of Texas at Arlington.;

  • 授予单位 The University of Texas at Arlington.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 345 p.
  • 总页数 345
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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