黏土固化注浆帷幕控制重金属污染物运移的数值模拟  

Numerical simulation of heavy metal cations transport controlled by clay-solidified grouting curtain in landfills

作　　者：陈永贵[1,2] 邹银生[2] 张可能[3] 

机构地区：[1]长沙理工大学岩土工程研究所,长沙410076 [2]湖南大学土木工程学院,长沙410082 [3]中南大学地学与环境工程学院,长沙410083

出　　处：《岩土力学》2006年第S1期31-34,共4页Rock and Soil Mechanics

基　　金：教育部高等学校骨干教师资助计划项目(教技司[2000]65号)

摘　　要：针对南昌市麦园垃圾卫生填埋场渗滤液防渗的实际情况,分析了重金属污染物在黏土固化注浆帷幕中的迁移转化特征,建立了地下水渗流模型和重金属污染物运移的耦合动力学模型。利用该模型对黏土固化注浆帷幕控制重金属污染物的迁移行为进行了模拟研究。数值模拟结果表明,在填埋场设计使用年限内黏土固化注浆帷幕对重金属污染物的阻滞率可以达到94.5%以上,重金属污染物在防渗系统中的浓度范围沿地下水水流方向逐渐扩展,同一位置的浓度值随时间的延续呈逐渐增大的趋势,但距离污染源越远,污染物的浓度越低。结合现场检测情况,证明了黏土固化注浆帷幕对重金属污染物具有较强的污染控制能力。The heavy metal cations transport in clay-solidified grouting curtain is studied for the pollution of groundwater in Maiyuan Domestic Waste Landfill in Nanchang city.A couple mathematical model for groundwater flow and heavy metal cations migration was developed based on analyzing the characteristics of migration and transformation of heavy metal leaching from the landfill to groundwater through the clay-solidified grouting curtain.The pollution of groundwater of Maiyuan problem is used to provide a quantitative verification and validation of the model.The result indicates that the retention ratio of clay-solidified grouting curtain to heavy metal cations is higher than 94.5 %;heavy metal concentration values increase with longer time and decrease with distance from the pollution source.Combined with the measured data in landfill site,clay-solidified grouting curtain was proved to serve as a sufficiently effective vertical barrier against heavy metal cations transport in municipal solid waste landfills.

关 键 词：填埋场 黏土固化注浆帷幕 重金属 污染 数值模拟 

分 类 号：X705[环境科学与工程—环境工程] TU993[建筑科学—市政工程]