| 冻融循环下含磷材料固化锌铅污染土的强度及溶出特性研究 |
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| 引用本文： | 魏明俐,伍浩良,杜延军,夏威夷.冻融循环下含磷材料固化锌铅污染土的强度及溶出特性研究[J].岩土力学,2015,36(Z1):215-219. |
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| 作者姓名： | 魏明俐 伍浩良 杜延军 夏威夷 |
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| 作者单位： | 东南大学 江苏省城市地下工程与环境安全重点实验室，江苏 南京210096 |
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| 基金项目： | 国家自然科学基金重点项目（No. 41330641）；国家自然科学基金（No. 51278100, No.41472258）；863计划（No. 2013AA06A206）；江苏省自然科学基金（BK 2012022）。 |
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| 摘 要： | 采用新型含磷材料（KMP）及水泥（PC）固化稳定化锌（Zn）、铅（Pb）重金属污染土，研究试验土经冻融循环后的毒性浸出（CLP）、无侧限抗压强度（UCT）、压汞试验（MIP）及化学形态分析（BCR），探究固化污染土的力学特性及耐久特性。试验结果表明，经冻融循环后，未处理污染土Zn、Pb浸出值均超过中国土壤标准；采用KMP和PC固化后，Zn、Pb浸出浓度明显低于未处理污染土；KMP固化污染土比PC固化污染土重金属固化效果更为显著，并能达到中国土壤标准；与常规养护相比，冻融循环之后的固化土体强度明显减小；经过12级冻融循环的KMP固化复合Zn、Pb重金属污染污染土强度高于PC固化试样8.6倍。压汞试验表明，经12级冻融循环后固化污染土孔隙体积增大，化学形态分析结果表明，采用KMP、PC固化重金属污染土中可交换态Zn随着养护龄期的增长而减少，残渣态Zn增加。
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| 关 键 词： | 冻融循环 溶出特性 强度 重金属污染土 固化稳定化 |
| 收稿时间： | 2015-03-11 |
Experimental study of zn and pb contaminated soils stabilized with new phosphate-based binder under freeze-thaw cycles |
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| WEI Ming-li,WU Hao-liang,DU Yan-jun,XIA Wei-yi.Experimental study of zn and pb contaminated soils stabilized with new phosphate-based binder under freeze-thaw cycles[J].Rock and Soil Mechanics,2015,36(Z1):215-219. |
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| Authors: | WEI Ming-li WU Hao-liang DU Yan-jun XIA Wei-yi |
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| Institution: | Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Southeast University, Nanjing, Jiangsu 210096, China |
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| Abstract: | A novel phosphate-based binder(KMP) and Portland cement(PC) are used to stabilize the contaminated soils spiked with Zn and Pb. The strength and durable characteristics are evaluated by toxic characteristics leaching procedure(TCLP) tests, unconfined compressive strength(UCT) and sequential extraction procedures(BCR) after freeze-thaw cycle. The TCLP result shows that the leaching Zn and Pb value exceed the limit of china MEP regulatory but up to the stander after solidified by KMP and PC binder in the untreated soil. The UCT result shows that solidified soil is lower than the stander curing soil treated by freeze-thaw cycle. After 12 freeze-thaw cycles the qu of heavy metal contaminate soil solidified by KMP is higher than the PC. The MIP result shows that the pore size increases with the increase of freeze-thaw cycles. The BCR result shows that the exchangeable fraction Zn and Pb reduce with the increase of curing time but the residual fraction increases which soil solidified by KMP and PC. |
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| Keywords: | freeze-thaw cycle leach ability strength heavy mental contaminated soil solidification/stabilization |
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