受铅污染的土-膨润土竖向隔离墙材料的压缩及渗透特性试验研究

范日东; 杜延军; 陈左波; 刘松玉

受铅污染的土-膨润土竖向隔离墙材料的压缩及渗透特性试验研究 English Version

东南大学岩土工程研究所，江苏南京 210096

基金项目: 国家自然科学基金项目（51278100）；江苏省自然科学基金项目（BK2010060，BK2012022）；东南大学基本科研业务费项目（Seujq201107）；江苏省普通高校研究生科研创新计划项目（CXLX_0103）

详细信息

作者简介:
范日东(1988- )，男，博士研究生，主要从事环境岩土方面的研究。E-mail: ridong.van@gmail.com。

中图分类号: TU47
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出版历程
- 收稿日期: 2012-06-30
- 发布日期: 2013-05-26

Compressibility and permeability characteristics of lead contaminated soil-bentonite vertical cutoff wall backfills

Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China

摘要

摘要: 土-膨润土系竖向隔离墙广泛应用于工业污染场地修复工程中。由于黏土与污染液的相互作用，隔离墙的工程性质将发生改变。通过一维压缩固结试验，研究高岭土-膨润土系竖向隔离墙材料与硝酸铅溶液相互作用下的物理性质、压缩固结和渗透特性的改变规律，并给出机理解释。引入评价天然重塑黏土的压缩和渗透特性的归一化孔隙比e /e_L和孔隙指数I_v概念，进一步评价分析受铅污染土-膨润土系竖向隔离墙材料的压缩和渗透特性。
- 隔离墙 /
- 膨润土 /
- 高岭土 /
- 压缩 /
- 渗透
Abstract: Soil-bentonite (SB) vertical cutoff walls are widely used in remediation of contaminated lands. The engineering properties of SB cutoff wall backfills will dramatically change due to their interaction with contaminants. However, investigation of the effect of heavy metals on the compressibility and permeability characteristics of SB backfills is very limited. A series of oedometer tests are conducted for kaolin-bentonite mixtures being potentially used as SB backfills. The soil samples are prepared with designed bentonite contents of 5%, 10%, and 15%, lead concentrations of 0, 5, 10, and 50 mg/g, and water content of approximate liquid limit. The results show that after lead contamination, the liquid limit, pH, specific surface area, compression index, and permeability coefficient of the soils considerably change regardless of the bentonite content. To further interprete the test data, the concepts of the generalized state parameter (e/e_L) and the void index (I_v) are adopted to evaluate the compression and permeability properties of the soils before and after lead contamination. The results suggest that e/e_L versus lg_p and/or lg_k, and I_v versus lg_p can be used as a useful engineering tool to characterize the compressibility and permeability properties of lead contaminated SB backfills. Finally, an empirical equation is proposed to generalize the permeability of the soils before and after lead contamination.
- slurry cutoff wall /
- bentonite /
- kaolin /
- compressibility /
- permeability

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参考文献(41)

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