ABSTRACT
The volume of solid waste has immensely increased over the last decades in Kathmandu Valley (KTMV), the main urban center of Nepal. The Sisdol site was initially developed as a sanitary landfill site in 2005 to accommodate only 150 thousand tons of municipal solid waste (MSW) for 2.5 years however it received more than 3 million tons (~6 million cubic meters) of MSW over the period of 14 years until it turned into a vulnerable dumpsite. When extending more than 300 m horizontal distance, about 80 m high waste dump has already been reached, which created multiple problems in surrounding areas. Therefore, a slope stability analysis of the waste dump was carried out using SLOPE/W before designing the post-closure and land utilization plan of the dumpsite and surrounding area. The factor of safety (FoS) was calculated in three different critical sections of the dumpsite for both static and seismic loading cases. The FoS obtained in sections for the earthquake loading case confirms the slope of the waste dump seems unstable, which is also in compliance with the observation made at the site. The findings of the slope stability analysis in this study indicate the risk of sliding of the dumpsite along the road connecting the new Bancharedanda Landfill, which needs to be minimized with proper stabilization measures before post-closure and sustainable utilization of land in the Sisdol dumpsite.
