K V N S, Raviteja and Basha, B Munwar
(2018)
Optimum Design of Municipal Solid Waste (MSW)
Dumps: A Reliability-based Approach.
PhD thesis, Indian institute of technology Hyderabad.
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Abstract
The increase of population, rapid urbanization and improved living standards of the
people have all led to the exponential growth of municipal solid waste (MSW) generation in
India as well as in the rest of the world. The scarcity of enough land and capital, it is always
a challenge to establish a new landfill facility. Consequently, the authorities are being forced
to use the existing MSW landfills though they exceeded their design capacities turning out
them to massive MSW dumps. The continuous dumping of MSW leads to steeper slopes
which pose a threat to the MSW slope stability. Improper compaction practices, lack of daily
soil/geosynthetic covers, the absence of drainage and leachate collection systems at the dump
sites accelerates the chances of catastrophic failures in MSW dumps.
The MSW is a highly heterogeneous and complex material and subjected to various
stress conditions due to placement and compaction practices, leachate/pore fluid pressures,
decay and disintegration, physical, chemical and biological changes. It is necessary to study
and understand the variability associated with the geotechnical properties of the MSW to
deliver safer designs.
The construction of a landfill commences with installation of soil and GMB liners to
avoid the contaminant transport. The design without considering uncertainties associated with
the shear parameters of the MSW and the soil-liner interface friction angle may yield
potentially misleading conclusions in terms of slope safety levels. The deterministic
approaches ignoring the variability of these design parameters, which are random in nature,
may cause a higher or lower probability of failure of the system. It can also be noted that the
factor of safety approach yields either too conservative or unsafe designs.
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