NaCl侵蚀环境下水泥固化铅污染土强度及微观特性试验研究

doi:10.13722/j.cnki.jrme.2014.0929

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摘要含有硫酸盐及盐酸盐等高含盐量的地下水环境，对固化/稳定法处置的重金属污染土的工程性质可能存在一定的影响，进而直接影响土体的固化效果。通过系统的室内试验，着重研究水泥固化铅污染土在NaCl溶液侵蚀环境下的强度特性和微观结构特征。试验结果表明，固化土的无侧限抗压强度随着NaCl溶液浓度的增加而减小，压缩性随NaCl浓度的增加而增大。浸泡7 d时，其强度最小，压缩性最大；超过7 d后，强度随浸泡时间的增加而增大，压缩性则随之减小。三轴试验结果表明，固化土的应力–应变特性大致分为弹性变形、塑性屈服和破坏阶段3个不同阶段。由于NaCl的侵蚀作用，浸泡7 d的固化土中孔隙增多，结构较为疏松，浸泡28和90 d试样的颗粒排列较7 d要致密规则。

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	查甫生
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关键词 ：土力学, 固化稳定法, NaCl侵蚀, 铅污染土, 强度, 微观结构

Abstract：Under the groundwater environment that is rich in sulfate and chloride ions，solidified/stabilized heavy metal contaminated soils may suffer secondary pollution and resulting in the deterioration of solidification effectiveness. Thus，the strength and microstructure characteristics of cement solidified/stabilized lead contaminated soils under the secondary pollution by sodium chloride solution were studied. A systemic experiment program was performed on the cement solidified/stabilized Pb2+ contaminated soil. Test results show that the unconfined compressive strength of solidified soils decreased and compressibility increased with the increased in concentration of sodium chloride solution. The strength reached minimum and compressibility reached maximum when specimens soaked for 7 days. After soaking for more than 7 days，with the immersion time increased，the strength enhanced and the compressibility decreased. The results of triaxial compression test show that the stress-strain curves of solidified soils can be divided into three different sections：elastic deformation stage，plastic yielding stage and failure stage. Scanning electron microscopy(SEM) results indicate that erosion of sodium chloride solution leaded to porosity increased and loose structure of the solidified soils. Particles of the sample that soaked 28 and 90 days arranged more compactly and steadily than that soaked 7 days.

Key words： soil mechanics solidification/stabilization method sodium chloride erosion lead contaminated soil strength microstructure

引用本文:

查甫生，刘晶晶，郝爱玲，崔可锐. NaCl侵蚀环境下水泥固化铅污染土强度及微观特性试验研究[J]. 岩石力学与工程学报, 2015, 34(S2): 4325-4332.
ZHA Fusheng，LIU Jingjing，HAO Ailing，CUI Kerui. EXPERIMENTAL STUDY OF STRENGTH AND MICROSTRUCTURE CHARACTERISTICS OF CEMENT SOLIDIFIED LEAD CONTAMINATED SOIL ERODED BY SODIUM CHLORIDE SOLUTION. , 2015, 34(S2): 4325-4332.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.0929 或 https://rockmech.whrsm.ac.cn/CN/Y2015/V34/IS2/4325

[1]	袁建新.环境岩土工程问题综述[J].岩土力学，1996，17(2)：88-93.(YUAN Jianxin. Summarize of environmental geotechnical engineering problems[J].Rock and Soil Mechanics，1996，17(2)：88-93.(in Chinese))
[2]	苏燕，周健.环境岩土工程研究现状与展望[J].岩土力学，2004，25(9)：1510-1514.(SU Yan，ZHOU Jian. State-of-arts and prospect of environmental geotechniques[J]. Rock and Soil Mechanics，2004，25(9)：1510-1514.(in Chinese))
[3]	YIN CY. Chemical stabilization of scrap metal yard contaminated soil using ordinary Portland cement：strength and leachability aspects[J].Building and Environment，2007，42(2)：794-802.
[4]	AL-AMOUDI OSB，MASLEHUDDIN M，ABDUL-ALYAB. Role of chloride ions on expansion and strength reduction in plain and blended cements in sulfate environments[J].Construction and BuildingMaterials，1995，9(1)：25-33.
[5]	ZHANG M H，CHEN J K，LV Y F，et al. Study on the expansion of concrete under attack of sulfate and sulfate-chloride ions[J]. Construction and Building Materials，2013，39(2)：26-32.
[6]	GLASSER FP，MARCHAND J，SAMSON E. Durability of concrete-degradation phenomena involving detrimental chemical reactions[J]. Cement and Concrete Research，2008，38(2)：226-246.
[7]	肖佳，赵金辉，陈雷，等.氯盐对水泥-石灰石粉胶凝材料硫酸盐侵蚀的影响研究[J].混凝土与水泥制品，2008，5：17-20.(XIAO Jia，ZHAO Jinhui，CHEN Lei，et al. Study of the effect of chloride on cement-ground lime stone binding materials immersed in sulfate solution[J]. China Concrete and Cement Products，2008，5：17-20.(in Chinese))
[8]	CUISINIER O，LE BORGNE T，DENEELE D，et al. Quantification of the effects of nitrates，phosphates and chlorides on soil stabilization with lime and cement[J]. Engineering Geology，2011，117(3/4)：229-235.
[9]	查甫生，许龙，崔可锐.水泥固化重金属污染土的强度特性试验研究[J].岩土力学，2011，33(3)：652-664.(ZHA Fusheng，XU Long，CUI Kerui. Strength characteristics of heavy metal contaminated soils stabilized/solidified by cement[J]. Rock and Soil Mechanics，2011，33(3)：652-664.(in Chinese))
[10]	TUMIDAJSKI PJ，CHAN GW. Effect of sulfate and carbon dioxide on chloride diffusivity[J]. Cement and Concrete Research，1996，26(4)：551-556.
[11]	范礼彬，章定文，邓永锋，等.氯盐对水泥固化土应力应变特性影响分析[J].工程地质学报，2012，20(4)：621-626.(FAN Libin，ZHANG Dingwen，DENG Yongfeng，etal. Experimental study of stress-strain characteristics of cement treated chlorate salt rich clays[J]. Journal of Engineering Geology，2012，20(4)：621-626.(in Chinese))
[12]	宁宝宽，陈四利，刘斌.环境侵蚀下水泥土力学特性的时间效应[J].水文地质工程地质，2005，2：82-86.(NING Baokuan，CHEN Sili，LIU Bin. Time effect of cemented soil mechanical properties under environmental erosion[J]. Hydrogeololgy Engineering Geology，2005，2：82-86.(in Chinese))
[13]	宁宝宽，陈四利，刘斌，等.环境侵蚀下水泥土的力学效应试验研究[J].岩土力学，2005，26(4)：600-603.(NING Baokuan，CHEN Sili，LIU Bin，et al. Experimental study of cemented soil under environmental erosion[J].Rock and Soil Mechanics，2005，26(4)：600-603.(in Chinese))
[14]	宁宝宽，陈四利，丁梧秀，等.环境侵蚀下水泥土的强度及细观破裂过程分析[J].岩土力学，2009，30(8)：2215-2219.(NING Baokuan，CHEN Sili，DING Wuxiu，et al. Analysis of meso-fracture process of cemented soil under environmental erosion[J]. Rock and Soil Mechanics，2009，30(8)：2215-2219.(in Chinese))
[15]	白晓红，赵永强，韩鹏举，等. 污染环境对水泥土力学特性影响的试验研究[J]. 岩土工程学报，2007，29(8)：1 260-1 263.(BAI Xiaohong，ZHAO Yongqiang，HAN Pengju，et al. Experimental study on mechanical property of cemented soil underenvironmental contaminations[J].Journal of Geotechnical Engineering，2007，29(8)：1 260-1 263.(in Chinese))
[16]	韩鹏举，白晓红，赵永强，等.Mg2+和相互影响对水泥土强度影响的试验研究[J]. 岩土工程学报，2009，31(1)：72-76.(HAN Pengju，BAI Xiaohong，ZHAO Yongqiang，et al. Experiment study on strength of cement oil under Mg2+andinteraction influence[J].Journal of Geotechnical Engineering，2009，31(1)：72-76.(in Chinese))
[17]	朱春鹏，刘汉龙，张晓璐.酸碱污染土压缩特性的室内试验研究[J].岩土工程学报，2008，30(10)：1477-1483.(ZHU Chunpeng，LIU Hanlong，ZHANG Xiaolu. Laboratory tests on compression characteristicsof soil polluted by acid and alkali[J]. Chinese Journal of Geotechnical Engineering，2008，30(10)：1477-1483.(in Chinese))
[18]	中华人民共和国行业标准编写组. JTGE 40—2007 公路土工试验规程[S]. 北京：人民交通出版社，2007.(The Professional Standards Compilation Group of People¢s Republic of China. JTGE 40—2007 Test methods of soils for highway engineering[S]. Beijing：China Communications Press，2007.(in Chinese))
[19]	熊厚金，林天健，李宁.岩土工程化学[M].北京：科学出版社，2001：502-505.(XIONG Houjin，LIN Tianjian，LI Ning. Geotechnical engineeringchemistry[M]. Beijing：Science Press，2001：502-505.(in Chinese))
[20]	MALLIOU O，KATSIOTI M，GEORGIADIS A，et al. Properties of stabilized/solidified admixtures of cement and sewage sludge[J].Cement and Concrete Composites，2007，29(1)：55-61.
[21]	BHATTYMSY. Fixation of metallic ions in Portland cement[C]// Proceedings of the 4th National Conference on Hazardous Wastes and Hazardous Materials. [S.l.]：[s.n.]，1987：1140-1145.
[22]	王沛，王晓燕，柴寿喜.滨海盐渍土的固化方法及固化土的偏应力-应变[J].岩土力学，2010，31(12)：3939-3944.(WANG Pei， WANG Xiaoyan，CHAI Shouxi. Solidifying methods for inshore saline soil and its deviator stress-strain[J]. Rock and Soil Mechanics，2010，31(12)：3939-3944.(in Chinese))
[23]	XING HF，YANGXM，XUC，et al. Strength characteristics mechanisms of salt-rich soil-cement[J]. Engineering Geology，2009，103(1/2)：33-38.
[24]	陈蕾.水泥固化稳定重金属污染土机理与工程性质研究[博士学位论文][D].南京：东南大学，2010.(CHEN Lei. Study of the mechanismand engineering properties of cement stabilized/solidified heavy metal contaminated soils[Ph. D. Thesis][D]. Nanjing：Southeast University，2010.(in Chinese))