作　　者： ; ; ; ;

机构地区： 清华大学环境学院

出　　处： 《清华大学学报（自然科学版）》 2004年第12期1684-1687,共4页

摘　　要： 为改进填埋场防渗层系统结构设计,建立了压实粘土衬层、土工膜衬层和复合衬层这三种衬层中水分与污染物迁移的数学模型。在填埋场典型设计条件下,复合衬层年渗滤液泄漏量和溶质稳态泄漏量仅为粘土衬层的0.4%和1.2%,为土工膜衬层(下伏基础层)的0.9%和0.1%。复合衬层土工膜与粘土层结合不紧密时,渗滤液与溶质泄漏量为其结合紧密时的5.5倍。因此,复合衬层在防止渗滤液和污染物泄漏方面较土工膜衬层和压实粘土衬层具有明显优势,可作为卫生填埋场防渗衬层的优先推荐结构。在复合衬层设计中应保证土工膜与其下的压实粘土层的紧密良好接触,并避免土工膜单独作为衬层使用。 Models of water and contaminant transport in a compacted clay liner (CCL), a geomembrane liner and a composite liner were developed to compare the abilities of the three liners to prevent leachates and contaminants from migrating out of the landfills. For typical landfill designs, the annual leachate and solute contaminant leakage from the composite liner were only 0.4% and 1.2% of those from a CCL, and 0.9% and 0.1% of those from a geomembrane liner with subsoils of medium permeability. For a composite liner with poor contact between the geomembrane and the underlying clay, the leachate and solute leakage rates were 5.5 times higher than that with good contact. Therefore, the composite liner should be significantly better than the geomembrane liner and the CCL as an engineered hydraulic barrier. However, close contact between the geomembrane and the underlying compacted clay must be guaranteed in the structural design of the composite liner.

关 键 词： 垃圾填埋场 压实粘土衬层 土工膜 复合衬层 渗滤液 溶质 泄漏

领　　域： [环境科学与工程] [建筑科学] [建筑科学]