Abstract: he mainstream disposal method in China at present is to have the fly ash from the incineration of domestic waste solidified and stabilized and then be sent to the sanitary landfill for compartmentalized landfill. However, in engineering practice, the stacking slope ratio of fly ash often follows the ratio of 1∶3 that is more suitable for municipal solid waste, which the landfill storage capacity has not been maximally utilized. The stability of fly ash slope and final cover under different slope ratio, as well as the influence of length-to-width ratio and area of landfill reservoir on the storage capacity were analyzed. The research results showed that based on the geotechnical properties of fly ash itself, the designed value of the stacking slope ratio of fly ash could be adjusted from 1∶3 to 1∶2, or even to 1∶1, thus significantly increasing the storage capacity of the fly ash landfill. Considering the stability of the final cover layer of the fly ash landfill after its closure, the recommended stacking slope ratio of fly ash was 1∶2. The storage capacity of the fly ash landfill decreased with the increase of the length-to-width of the storage area, and the smaller the area of the landfill area, the greater the decrease in storage capacity.

Key words: domestic waste incineration fly ash, compartmentalized landfill, stability, slope ratio, length-to-width ratio, storage capacity