垃圾填埋场渗沥液水位壅高及工程控制

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Abstract High leachate mound is a common problem affecting safe operations in Chinese municipal solid waste(MSW) landfills. The water-retention characteristic，saturated hydraulic conductivity of MSWs and the clogging characteristics of leachate drainage layers are then summarized based on the data measured and from literatures. The influences of initial moisture content，water-retention characteristic and saturated hydraulic conductivities of MSWs and leachate drainage layers on water level of landfill are demonstrated by numerical analysis of moisture transport in landfills. The obtained results show that high leachate mound in the landfills is primarily caused by the decrease of permeability of MSWs with embedment depth and fill age，clogging of leachate collection layers and high initial moisture content of MSWs. Perched water in a landfill occurs in the case that MSWs have low permeability. The numerical analysis result is verified by the monitoring data in a landfill in southern China. The measures to control leachate mound of landfill are presented and put into practice.

Key words： seepage mechanics;landfill;leachate mound;perched water;initial moisture content field capacity hydraulic conductivity;clogging

Received: 25 November 2012

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