The correlation between internal erosion resistances with the hydraulic conductivity of residual soil

Soil physical properties, internal erosion resistance and hydraulic conductivity characteristics of a residual soil are presented in this paper. Hydraulic conductivity of underground soil can influence mechanism of internal erosion resistance and thus contribute to landslides. A randomly eight (8) selected soil samples were extracted from soil slopes within UiTM, Shah Alam Campus in which the samples are different in nature. Compaction test has been applied to all the samples in order to measure the value of Optimum Moisture Content (OMC) and maximum dry density, which will give a fair result in comparison of all disturb (remoulded) samples used in determining the hydraulic conductivity by using Falling Head test. It is found that the coefficient of permeability is influenced by the classification of soil, maximum dry density and OMC of soil. A pinhole test, crumb test and cylinder dispersion test were conducted to investigate the soil dispersibility characteristic. The results shows that the soil dispersibility characteristics are clearly determined and it shows in good agreement with the hydraulic conductivity of the compacted soil. This indicates that the soil samples with higher composition of coarse-grained particles have higher dispersibility and hydraulic conductivity that lead to lower resistance to internal erosion.