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An evaluation of the environmental protection provided by composite liner systems.

机译：对复合衬里系统提供的环境保护的评估。

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摘要

The effect of calcium uptake by hydration and diffusion from an adjacent calcium-rich soil on the performance of a geosynthetic clay liner (GCL) is examined for three cases. In Case 1 the GCL rested directly on a soil with a high calcium (1800 mg/l) concentration in the pore water (called "calcium rich soil" herein). Case 2 involved a GCL resting on 300 mm of soil with a low (200 - 300 mg/l) calcium concentration in the pore water ("foundation soil") overlying the calcium rich soil. In the third ("control case"), the GCL only rested on the foundation soil. The overburden pressure was 15 kPa. The moisture content of GCL increased to 96%, 86% and 108% in the first 279 days for Cases 1, 2 and 3 respectively. Under isothermal conditions, the GCL moisture content decreased to 80% and 67% for Cases 1 and 2 respectively and increased to 113% for Case 3. After 1100 days, the hydraulic conductivity (k) of the GCL was 4x10-11 m/s for Case 3 but had increased up to about 7x10-11 m/s and 2x10 -10 m/s for cases with and without the foundation layer respectively. The results are used to calibrate finite element models. A good correlation was found between k the bulk void ratio (eB) of GCL.;Leakage and contaminant transport through 10 mm diameter hole in a geomembrane in a composite liner involving a GCL is examined at a stress of 100 kPa for hydraulic heads of 0.3 or 1 m. When permeated with distilled water, the interface transmissivity (theta) was about 2.3 x10-11 m 2/s. After 800 days of permeation with 0.14M NaCl there was only about 3% increase in the flow despite an order of magnitude increase in GCL permeability near the hole because theta decreased from 2.3x10-11 m2/s to 1.1x10-11 m2/s and controlled the leakage despite the increase in GCL permeability. Numerical modeling demonstrated reasonable agreement with the observed transport.
机译：在三种情况下，研究了通过水合作用和从相邻的富含钙的土壤中扩散而吸收钙对土工合成粘土衬里（GCL）性能的影响。在案例1中，GCL直接放置在孔隙水中钙含量高（1800 mg / l）的土壤上（此处称为“富含钙的土壤”）。案例2涉及一个GCL，该GCL放置在300毫米的土壤中，而在富含钙的土壤上的孔隙水（“基础土壤”）中的钙浓度较低（200-300 mg / l）。在第三个案例中（“控制案例”），GCL仅停留在基础土壤上。上覆压力为15kPa。案例1、2和3的前279天，GCL的水分含量分别增加到96％，86％和108％。在等温条件下，情况1和2的GCL含水量分别降至80％和67％，对于情况3则增加至113％。1100天后，GCL的水力传导率（k）为4x10-11 m / s对于第3种情况，但对于有和没有基础层的情况，分别增加到大约7x10-11 m / s和2x10 -10 m / s。结果用于校准有限元模型。在k的GCL的整体空隙率（eB）之间发现了良好的相关性;在压力为100 kPa的液压头为0.3的情况下，检查了涉及GCL的复合衬里复合土工膜中穿过土工膜的10 mm直径孔的泄漏和污染物传输或1 m。当用蒸馏水渗透时，界面透射率θ约为2.3×10-11m 2 / s。用0.14M NaCl渗透800天后，尽管孔附近GCL渗透率增加了一个数量级，但流量仅增加了约3％，因为theta从2.3x10-11 m2 / s减小到1.1x10-11 m2 / s尽管GCL渗透率增加，但仍控制泄漏。数值模拟表明与观测到的运输有合理的一致性。

著录项

  • 作者

    Abdelatty, Khaled.;

  • 作者单位

    Queen's University (Canada).;

  • 授予单位 Queen's University (Canada).;
  • 学科 Geotechnology.;Engineering Civil.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 375 p.
  • 总页数 375
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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