摘要
土体受到重金属离子污染后,会引起土的工程性质的改变,重金属离子的渗出也会给周围环境带来严重的危害。在国外,目前常采用水泥固化技术来处治重金属污染土;而在我国,这方面的研究成果还很少。主要通过系统的室内试验和理论分析,研究了在不同污染物掺量、污染物类型、水泥掺量以及养护龄期条件下固化污染土的强度特性。试验结果表明,金属污染物的存在会导致土体无侧限抗压强度较小幅度的降低,但随着水泥掺入量及养护龄期的增加,土体强度会有显著提高。试验结果还发现,不同的污染物类型及掺入量对固化污染土强度存在不同的影响,NaCl能促进水泥固化土早期强度的提高,而CuCl2和AlCl3则会阻碍水泥与土的固化反应。
Heavy metal ions in soil may lead to the change in soil engineering properties.Their leakage would also harm the surrounding environment.The published literatures show that cement solidification technology can effectively improve the strength characteristics of heavy metal contaminated soils.Considering pollutant type and content,cement content and curing time,a series of experiment programs and theoretical analyses were performed to study the strength characteristics of heavy metal contaminated soils stabilized/solidified by cement.The test results show that the presence of metal contaminants will reduce soil strength;but as the increase of the cement content and the curing time,soil strength will be significantly enhanced.It is noticed that different pollutant types and contents will bring different influences;NaCl can promote the early strength of cement;but the CuCl2 and AlCl3 will hinder the cementation reaction during curing.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2012年第3期652-656,664,共6页
Rock and Soil Mechanics
基金
国家自然科学基金资助项目(No.41172273
40802079)
合肥工业大学科研发展基金资助项目(No.2010HGXJ052)
关键词
重金属
污染土
水泥
固化稳定法
heavy metal
contaminated soils
cement
solidification/stabilization
