冻融循环对不同固化铅污染土抗剪指标的影响
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摘要
冻融循环对不同固化重金属铅污染土工程特性的劣化效应不尽相同。该文分别使用水泥、石灰、粉煤灰对人工制备的铅污染土进行固化修复,对修复土样进行反复冻融后,通过直剪试验测得了各土样的抗剪指标。使用计算机绘图分析所得抗剪指标,得到了冻融循环对固化铅污染土抗剪强度的劣化规律。试验结果表明,三类固化剂能大幅提高固化铅污染土的抗剪指标,但提高程度有所不同;冻融循环作用会劣化固化铅污染土的抗剪指标,其劣化作用也因修复土样种类不同而有较大差别。
The effects of freeze-thaw cycling on the deterioration characteristics of different solidified heavy metal lead-contaminated soils are not the same. In this paper, the artificially prepared lead-contaminated soil was solidified and repaired by cement, lime and fly ash respectively. After repeated freezing and thawing to the repaired soil samples, the shear indexes of each soil sample were measured by direct shear tests. The computer mapping was used to analyze the obtained shear index, the deterioration law of the shear strength of the solidified lead-contaminated soil was obtained by freeze-thaw cycling. The test results showed that the three types of curing agents can greatly improve the shearing index of the solidified lead-contaminated soil, but the degree of improvement is different; the freeze-thaw cycling deteriorates the shearing index of the solidified lead-contaminated soil, and the deterioration effects also differ due to the type of soil samples to be repaired.
The effects of freeze-thaw cycling on the deterioration characteristics of different solidified heavy metal lead-contaminated soils are not the same. In this paper, the artificially prepared lead-contaminated soil was solidified and repaired by cement, lime and fly ash respectively. After repeated freezing and thawing to the repaired soil samples, the shear indexes of each soil sample were measured by direct shear tests. The computer mapping was used to analyze the obtained shear index, the deterioration law of the shear strength of the solidified lead-contaminated soil was obtained by freeze-thaw cycling. The test results showed that the three types of curing agents can greatly improve the shearing index of the solidified lead-contaminated soil, but the degree of improvement is different; the freeze-thaw cycling deteriorates the shearing index of the solidified lead-contaminated soil, and the deterioration effects also differ due to the type of soil samples to be repaired.
引文
[1]范日东,杜延军,刘松玉.城市工业污染场地修复技术研究现状与发展趋势[C]//第九届全国工程地质大会论文集,2012.
[2]廖晓勇,崇忠义,阎秀兰,等.城市工业污染场地:中国环境修复领域的新课题[J].环境科学,2011(3):784-794.
[3]许龙.重金属污染土的固化修复及长期稳定性研究[D].合肥:合肥工业大学,2012.
[4]GB/T50123-1999土工试验方法标准[S].北京:中华人名共和国水利部,1999.
[5]Boardman D.J.Lime stabilization:clay-metal-lime interactions[D].Loughborough:Loughborough University,1999.
[6]邓仁峰.冻融循环对水泥固化铅污染土工程特性的影响及其机理研究[D].重庆:重庆大学,2017.
[2]廖晓勇,崇忠义,阎秀兰,等.城市工业污染场地:中国环境修复领域的新课题[J].环境科学,2011(3):784-794.
[3]许龙.重金属污染土的固化修复及长期稳定性研究[D].合肥:合肥工业大学,2012.
[4]GB/T50123-1999土工试验方法标准[S].北京:中华人名共和国水利部,1999.
[5]Boardman D.J.Lime stabilization:clay-metal-lime interactions[D].Loughborough:Loughborough University,1999.
[6]邓仁峰.冻融循环对水泥固化铅污染土工程特性的影响及其机理研究[D].重庆:重庆大学,2017.