Correlation Study of Shrinkage Expansion Potential of Clay Soil In PLTMH Cileunca, Pangalengan, Bandung, Indonesia

Abstract

Mini Hydro Power Plants (MHPs) utilize the potential of water to generate
electrical energy. However, construction on clay soils that have the
potential to expand and contract can affect the stability of the structure.
This study aims to evaluate the potential for soil development in the
Cileunca MHP. The methods used to determine soil development potential
include Chen (1988), Skempton (1953), and Seeds (1962) methods.
Mineral identification was conducted through X-Ray Diffraction (XRD)
testing of soil samples taken by the handboring method. The results of the
analysis showed that the Skempton method showed 67% of the samples
had activity values > 0.75 (“high” category). The Chen method indicated
60% of the samples had a plasticity index (PI) > 35% (“very high”
category). The Seeds method indicated 73% of the samples had a
development potential > 25% (very high category). XRD testing indicated
the dominant mineral was dehydrated Halloysite (Al2Si5(OH)4). The soil
at the Cileunca MHP site has a high development potential that can
damage building foundations. Foundation stability is strongly influenced
by expansive soil properties, so soil stabilization treatment is needed to
prevent structural damage. This study concludes that the soil at the
Cileunca MHP site has a high development potential, which can cause
structural problems. Therefore, soil stabilization treatment is highly
recommended to ensure the stability of the building foundation