下蜀黄土用作填埋场衬垫层的防渗试验

Experiment on permeability of Xiashu loess for landfill liner

城市固体垃圾的填埋处置是我国今后相当长时间内垃圾的主要处理方式,衬垫层在垃圾卫生填埋场设计中居于关键地位。从我国国情出发,选取长江中下游地区广泛分布的下蜀黄土为研究对象,通过对其本征特性、击实特性以及在不同状态下的渗透性能等的试验研究,揭示下蜀黄土的渗透规律,确定其用作垃圾填埋场衬垫层的有效方式,为合理开发和有效利用下蜀黄土这种廉价资源进行环境保护提供可靠的理论依据。

Landfill is a preferable method of ultimate disposition of municipal solid waste in our country in the future. The landfill liner plays a key part in landfill design and construction. This paper chooses Xiashu loess as research object, such characteristics as chemical composition, minerals, grain size distribution, compacting degree and permeability at different state of the soil are completely investigated in laboratory. The research results indicate that the permeability of Xiashu loess can be much less than 10^-7 cm/s, which is the criterion adopted by some eodes. This offers a theoretical basis for Xiashu loess used for landfill disposition of municipal solid waste.