混合粉质粘土和疏浚土填埋场防渗垫层的环境土工特性研究  

Geoenvironmental properties of silty soil mixed with dredged soil applied as clay liner of landfill

作　　者：唐晓武[1] 史成江[1] 林廷松[1] 罗春泳[2] 

机构地区：[1]浙江大学岩土工程研究所,浙江杭州310027 [2]上海交通大学建工与力学学院,上海200030

出　　处：《岩土工程学报》2005年第6期626-631,共6页Chinese Journal of Geotechnical Engineering

基　　金：教育部优秀留学归国人员择优资助计划(教外司留[2003]406号);教育部优秀青年教师资助计划(教人司[2003]355号)

摘　　要：充分利用疏浚土有机质含量高、吸附能力强和低透水性等特点,将其作为填埋场粘土衬垫的添加材料。等温吸附试验和扩散试验的结果表明:粉质粘土掺入疏浚土后,对金属离子的吸附能力得到增强,尤其对高价Cu2+的吸附能力显著提高,同时可以显著地降低Cu2+的扩散系数。研究表明,有机质对Cu2+的强吸附能力是Cu2+扩散系数降低的主要原因。粉质粘土掺入疏浚土后极大地提高了粘土衬垫的环境土工特性,非常适合作为填埋场粘土衬垫。Due to the high organic content of dredged soil, its ability to adsorb various contaminants such as heavy metals warranted an investigation of its use in clay liner of landfill. A combination of silty soil with dredged soil to enhance the geoenvironmental properties was investigated by series of laboratory tests involving adsorptivity and diffusibility which were mainly cared in clay liner of landfill. It was shown that the mixed soil (dredged soil and silty clay) had much larger adsorption capacity for Cu2+ than silty clay, and its strong adsorption capacity for Cu2+ resulted in a barrier with the mixed soil having a much less diffusion coefficient than silty clay.

关 键 词：粘土衬垫 填埋场 疏浚土 吸附能力 扩散系数 

分 类 号：TU411[建筑科学—岩土工程]