| 摘要: |
| 【目的】研究受Cr3+污染黄土的压缩变形特性，为黄土衬垫应用提供依据。【方法】采用陕西省杨凌区Q3黄土作为研究对象，在土中掺入不同质量的九水合硝酸铬，人工制备Cr3+质量分数分别为0%(CK)，0.1%，0.2%，0.5%和1.0%，含水率分别为14%，18%，22%的Cr3+污染黄土，对其进行压缩固结试验，分析Cr3+含量和含水率对污染黄土的压缩曲线、压缩模量和应力-应变曲线的影响。【结果】Cr3+污染黄土的压缩曲线随Cr3+污染程度的加剧出现变化，压缩模量较未污染黄土(CK)增大，压缩竖向变形量较未污染黄土减小，并且随着Cr3+污染程度的加重呈减小趋势。在描述应力-应变关系时，幂函数比双曲线函数更能准确地反映Cr3+污染黄土的变形特性。含水率变化对未污染黄土的压缩变形影响较大，对Cr3+污染黄土的压缩变形影响随污染程度的加剧而呈减小趋势。【结论】随着Cr3+污染程度的增大，污染黄土的压缩性较未污染黄土降低，压缩变形减小，且应力－应变曲线符合幂函数模型。 |
| 关键词: 环境岩土工程 污染土 黄土 压缩变形特性 |
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| 基金项目:国家自然科学基金青年项目(51409217)；中央高校基本科研业务专项科技创新一般项目(2014YB047);陕西省社会发展攻关项目(2013k13-04-11);榆林市产学研合作项目(2014cxy-05);陕西省教育厅项目(16JK1897) |
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| Compression and deformation characteristics of loess contaminated by Cr(Ⅲ |
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LIU Gang,YANG Xiujuan,FAN Henghui,et al
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| Abstract: |
| 【Objective】This study investigated the compression and deformation characteristics of loess contaminated by Cr3+ to provide information for application of loess gasket material. 【Method】The polluted loess with different Cr3+ concentrations(0%(CK),0.1%,0.2%,0.5% and 1.0%) and water contents (14%,18%,and 22%) were prepared with loess in Yangling,Shaanxi.Compression test was conducted to study compression and deformation properties of polluted loess.Compression curves,compression modulus and strain stress relationship were compared between normal loess and contaminated loess.【Result】Compression of contaminated loess showed significant changes compared to uncontaminated loess (CK).Compression modulus increased and strain decreased gradually with the increase of Cr3+ content in loess sample.The compression and deformation characteristics of contaminated loess were better reflected by power function.The significant influence of water content on compression of contaminated loess decreased as the increase of Cr3+ content.【Conclusion】With the increase of Cr3+ content,compressibility and compressive deformation of contaminated loess decreased and the stress strain curves fit power function. |
| Key words: environmental geotechnical engineering contaminated soil loess compression and deformation characteristics |
