中文摘要：

针对填埋场渗滤液入渗量随降雨量、垃圾含水量等因素不断变化这一问题，在扩展的Dupuit假定基础上推导导排系统瞬态水位计算方法．当入渗量恒定时，采用该方法计算的最终结果和稳态计算结果趋于一致．通过与Korfiatis等的室内实验结果比较，该方法是合理和相对准确的．通过参数分析发现，对于排水系统来说，排水距离越长，达到稳定水位所需要的时间越长，适当增加排水系统的坡度可以非常有效地控制水位深度；在渗透系数减小到一定程度后，会导致水位的大幅增加．

英文摘要：

The infiltration of the leachate in a landfill varies with several factors such as rainfall and water content of waste. Aiming at the problem, a method to calculate the variation of the liquid depth over landfill liner in time was presented based on the extended Dupuit assumption. The results from the method approached the results from steady state solution under constant inflowrate. The presented formula was rational compared with the results tested by Korfiatis. The parameter analysis showed that the maximum liquid depth was proportional to the maximum distance of flow. The increase of the dimensionless slope o[ drainage layer can effectively decrease the maximum liquid depth, and a greater hydraulic conductivity can be specified to prevent the over-height of liquid head.