重金属污染物侵入对土体强度影响的试验研究  

An experimental study on effects of invasion of heavy metal contaminants on soil strength

作　　者：莫菲苹 程峰[1] 

机构地区：[1]中国有色桂林矿产地质研究院有限公司,广西桂林541004

出　　处：《矿产与地质》2015年第1期114-118,共5页Mineral Resources and Geology

基　　金：国家科技部院所开发专项项目[2011]152资助

摘　　要：通过三轴试验、压缩试验和直剪试验对重金属污染土进行了研究,在100、200、300KPa围压条件下,对5种重金属含量不同的污染土试样：一般土、污染土（重金属元素质量比分别为：1%、3%、5%、7%）进行三轴对比试验,试验结果表明：污染土的强度随着重金属元素的含量的增加显著降低,围压增大对重金属含量低的污染土的强度的影响不显著,质量比小于3%时,峰值强度降低10%-15%,质量比大于5%时,峰值强度降低40%-50%;直剪试验结果表明：质量比小于3%的污染土抗剪强度-垂直压力曲线基本平行,垂直压力与抗剪强度成正比,抗剪强度降低幅度为5%-10%,质量比大于5%的污染土抗剪强度-垂直压力曲线表现为不规则,抗剪强度降低45%-55%左右;压缩试验结果表明,污染土与一般土的压缩量差别较大,质量比超过5%以上时对压缩性的影响尤为显著。This paper studied on heavy metal contaminated soil through triaxial test,compression test and direct shear test.Under the confining pressures of 100,200 and 300kPa,triaxial comparison test is conducted on 5kinds of contaminated soil samples with different contents of heavy metal（1kind of ordinary soil and 4kinds of contaminated soil with heavy metal mass ratio of 1%,3%,5% and 7% respectively）,and the results suggest that the strength of contaminated soil decreases as the content of heavy metal content increases,and the growth of confining pressure has no significant influence on the strength of contaminated soil with low content of heavy metal.While the mass ratio is less than 3%,the peak strength decreases by 10% to15%;while the mass ratio is more than 5%,the peak strength decreases by 40%to 50%.The results of direct shear test suggest that in contaminated soil with mass ratio of less than 3% the relation curve of shear strength and vertical pressure is parallel in general,and vertical pressure is in direct proportion to shear strength,and shear strength decreases by 45% to 55%;in contaminated soil with mass ratio of more than5%,the relation curve of shear strength and vertical pressure is irregular and shear strength decreases by45%to 55%.The results of compression test suggest that the amount of compression of contaminated soil is largely different than that of ordinary soil,and it has significant influence on compressibility while the mass ratio is more than 5%.

关 键 词：重金属污染土 质量比 土工试验 本构关系 

分 类 号：TU441[建筑科学—岩土工程]