Abstract:
Soil Biotechnology is a cost-effective and
environmentally friendly alternative method to improve
soil slope stability, as well as to control slope surface
erosion. Vegetation, which is part of soil bioengineering,
can indirectly affect slope stability through its influence
on fluctuations in soil water content. Furthermore, it has
the ability to control the adverse effects of rainfall on the
slope surface and can draw water from the soil through
evapotranspiration. These conditions can reduce soil
moisture and pore pressure, increase soil shear
strength, and increase resilience. Vegetation roots tend
to increase soil permeability, infiltration, and moisture
content. In this research, vegetation was used for soil
bioengineering in the form of plants that grow wild and
are easily found in the mainland of South Kalimantan
Province, in Indonesia. These plants include Teki,
Paitan, Elephant, Setaria, and Alang-alang grasses.
This research aims to determine the effects of different
plants and their root types on the surface of the soil
slope, especially to determine changes in the value of
the soil shear strength, the resisting moment of slope
failure, and the safety factor of the slope's stability.
Accordingly, soil testing and the analysis of slope
stability were carried out using the direct shear test and
the Bishop methods respectively with the help of the
2022 version of the Geo5 computer application program.
The results showed that the use of Elephant grass
vegetation on the slope surface was able to increase the
shear strength of the soil, the landslide resisting
moment, and the safety factor for slope stability which
was better than other types of vegetation
