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压实黏土衬垫是填埋场等环境岩土工程中常用的屏障材料,其厚度和渗透系数是主要的设计参数。考虑渗透系数的变异性,用衬垫底部污染物相对浓度和通量等指标分析了设计参数对衬垫有效性的影响。研究表明,渗透系数的变异性对衬垫性能有很大的影响:当衬垫厚度较小或渗透系数均值较大时,衬垫底部出现高浓度(接近于1)的概率很大,这个浓度区间可能比相对浓度的均值高很多,对周围环境污染有较大的威胁。从非反应性溶质的运移来看,我国规范中对衬垫厚度和渗透系数的规定是合理的。相对于污染物的通量,厚度和渗透系数对衬垫底部相对浓度的影响更为显著,相对浓度更适合作为评价衬垫性能的指标。
Compacted clay liner is a common barrier material used in environmental geotechnical engineering such as landfill. The thickness and permeability coefficient are the main design parameters. Taking into account the variability of the permeability coefficient, the influence of design parameters on the effectiveness of the liner was analyzed using the relative concentration and flux of pollutants at the bottom of the liner. Studies have shown that the variability of permeability coefficient has a great influence on the performance of the liner: when the thickness of the liner is small or the mean value of the permeability coefficient is large, the probability of occurrence of high concentration (close to 1) The interval may be much higher than the average of the relative concentrations, posing a greater threat to the surrounding environment. Judging from the migration of non-reactive solute, the regulations of liner thickness and permeability coefficient in our country are reasonable. Relative to the flux of pollutants, the effect of thickness and permeability coefficient on the relative concentration at the bottom of the liner is more pronounced, and the relative concentration is more suitable as an index to evaluate liner performance.