碱厂白泥作为填埋场衬层防渗土料的探索研究

首先分别对白泥和在青岛2个填埋场取回的2种粘土防渗土料(风化土和亚粘土)的压实性、抗剪性、渗透性以及收缩性等几个主要的衬层设计指标进行了对比评价,结果表明,白泥具有较差的压实性、良好的抗剪性和抗干裂性,测得其在最优含水率及相近含水率下的击实土样的渗透系数均在10-7cm/s数量级范围内。然后将白泥与2种粘土防渗土料进行复合,形成2种混合式的复合土料(白泥+风化土和白泥+亚粘土)和2个夹层结构复合土料(白泥/风化土和白泥/亚粘土),测试其渗透系数:亚粘土添加量为30%～40%的白泥+亚粘土混合土料以及2个夹层结构复合土料的防渗性能较好,渗透系数都达了10-8cm/s数量级。

Preliminary study on sodium soda residue as impermeable barrier material in landfill liners

A serie of tests were firstly performed for soda residue and two practical impermeable clay specimens(weathered clay and locm)from two different MSW landfills of Qingdao to evaluate three soils several main indexes of three soils including compactibility,permeability,shear strength and shrinkage ratio.It was shown that soda residue has poorer compactibility,higher shear strength and lower shrinkage ratio than other two clay specimens,and moreover its permeability could be in the order of 10-7 cm/s when it was compaced under optimum or near to optimum water contents.Based on the above experiments,the soda residue was combinted with two clay specimens respectively,forming two types of mixture of soils(soda residue+weathered clay and soda residue+sloam)and two interbedded soils(soda residue/weathering clay and soda residue/subclay),and then their coefficients of permeability were tested.It could be concluded that for both interbedded soils and the mixture of soils with 30%～40% additive,the permeability was ranged in the order of 10-8 cm/s.