CAJ | 학술논문

为确保重金属污染场地再开发利用的稳定性和安全性，采用室内加速碳化试验研究碳化对水泥固化铅污染土电阻率特性的影响规律。人工配制不同铅含量的污染土，采用水泥固化后进行室内加速碳化试验，分析碳化作用对固化土电阻率和pH值的影响规律，并讨论固化土的电阻率与无侧限抗压强度的相关关系。试验结果表明，碳化作用下水泥固化铅污染土的电阻率随着碳化时间和水泥掺入量的增加而增大，随着铅含量、孔隙率和饱和度的增加而减小。提出一个能够有效反映碳化时间、水泥掺入量和铅含量等因素对固化土电阻率影响的表征参数，采用该参数替代 Archie 电阻率模型中的土体孔隙率即可将Archie电阻率模型扩展应用到水泥固化重金属污染土领域。固化土的pH值随着铅含量增加而有所降低；碳化后固化土的pH值从11～12降低到8～9。固化土的电阻率与强度具较好的对应关系，电阻率法可作为一种有效的水泥固化铅污染土性能评价方法。
위학보중금속오염장지재개발이용적은정성화안전성，채용실내가속탄화시험연구탄화대수니고화연오염토전조솔특성적영향규률。인공배제불동연함량적오염토，채용수니고화후진행실내가속탄화시험，분석탄화작용대고화토전조솔화pH치적영향규률，병토론고화토적전조솔여무측한항압강도적상관관계。시험결과표명，탄화작용하수니고화연오염토적전조솔수착탄화시간화수니참입량적증가이증대，수착연함량、공극솔화포화도적증가이감소。제출일개능구유효반영탄화시간、수니참입량화연함량등인소대고화토전조솔영향적표정삼수，채용해삼수체대 Archie 전조솔모형중적토체공극솔즉가장Archie전조솔모형확전응용도수니고화중금속오염토영역。고화토적pH치수착연함량증가이유소강저；탄화후고화토적pH치종11～12강저도8～9。고화토적전조솔여강도구교호적대응관계，전조솔법가작위일충유효적수니고화연오염토성능평개방법。
In order to ensure the safety utilization of heavy metal contaminated ground,it is necessary to investigate the effect of carbonation on the performance of cement solidified heavy metal-contaminated soils. Artificial contaminated soils with three different lead contents were solidified using cement,and the electrical resistivity and pH values of the solidified samples before and after carbonation were tested. The carbonation led to an increase of the electrical resistivity of cement solidified lead-contaminated soils,but the electrical resistivity decreased with the increase of lead content,porosity and degree of saturation. A modified Archie′s electrical resistivity model was proposed by replacing the porosity with a parameter which represented the influence of carbonation time , cement content , and lead content on the electrical resistivity of cement solidified lead-contaminated soils. The Archie′s electrical resistivity model was extended to heavy metal contaminated soils. The results also showed that adding lead reduced slightly pH values of the solidified soils,and the pH values of the samples varied from 11–12 to 8–9 after carbonation. There is a nonlinear relationship between the electrical resistivity and the unconfined compression strength of solidified soils.