Abstract
Shallow landslide is the phenomenon of slope collapse frequently occurring in tropical rainforest regions such as Malaysia based on geotechnical problem. This paper aims to determine the effects of grass on the shallow slope’s stability in terms of the variability of soil moisture, and to establish 1D suction of soil moisture due to grass water uptake. Moisture variations were used to compare the moisture content with time using GID and Fotran code tools. Based on the literature review findings, numerical simulation modelling was applied to achieve the most suitable condition for replicating grass water uptake within the soil slope. Six types of grasses were used in this research. The correlation between numerical simulation results is appropriate for these six types of grasses, but only Indropogon Gayanus grass with field monitoring results was achieved for validation. This paper assessed slope stability due to the influence of six types of grasses induced suction. The long grassroots are special between both kinds of grass, ranging from 0.3048 m to 4.000 m. This work gives a clear belief that Axonopus Compressus grass extracts water much faster than other grasses and is useful in preserving unsaturated soil stability.
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