Cr^(3+)污染黄土压缩变形特性试验研究  

Compression and deformation characteristics of loess contaminated by Cr(Ⅲ)

作　　者：刘刚[1] 杨秀娟[1] 樊恒辉[1] 史祥[1] 李普[1] LIU Gang YANG Xiujuan FAN Henghui SHI Xiang LI Pu(College of Water Conservancy and Architectural Engineering, Northwest A＆F University ,gangling ,Shaanxi 712100 ,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2017年第3期227-234,共8页Journal of Northwest A&F University(Natural Science Edition)

基　　金：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)

摘　　要：【目的】研究受Cr^(3+)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Cr^(3+)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Cr^(3+)污染黄土,对其进行压缩固结试验,分析Cr^(3+)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】Cr^(3+)污染黄土的压缩曲线随Cr^(3+)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Cr^(3+)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Cr^(3+)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Cr^(3+)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Cr^(3+)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。【Objective】This study investigated the compression and deformation characteristics of loess contaminated by Cr-（3＋）to provide information for application of loess gasket material.【Method】The polluted loess with different Cr-（3＋）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 Cr-（3＋）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 Cr-（3＋）content.【Conclusion】With the increase of Cr-（3＋）content,compressibility and compressive deformation of contaminated loess decreased and the stress-strain curves fit power function.

关 键 词：环境岩土工程 污染土 黄土 压缩变形特性 

分 类 号：TU411.5[建筑科学—岩土工程]