The Effect of Geotechnical Characteristics Toward Road Damage at Lowland Area

Abstract

Road damage often occurs in lowland areas, one of the reasons is unstable soil conditions. This study aims to determine the relationship between geotechnical characteristics of soil and road damage. Field observations were carried out in the Tanjung Api-Api lowland area to find out the type of road damage. Testing of soil physical and mechanical properties was carried out to determine the geotechnical characteristics of the soil at that location. Results from current study show that that generally the types of road damage lowland areas are cracking, grade depressions, potholes, and distortion. The soil properties test results obtained that the soil in the Tanjung Api-Api lowland area was classified by Unified Soil Classification System (USCS) as an inorganic silt (MH) and organic clay soil with moderate to high plasticity (OH). In general, soil of this type has a low bearing capacity so that it requires handling and selection of construction that is suitable with this type of soil. Based on the classification of American Association of State Highway and Transportation Officials (AASHTO), the soil in the Tanjung Api-Api area is A-7-5 and A-5, which are clay and silt land with moderate to poor criteria if used as subgrade so that this land usually require s special handling when used as subgrade because it has the potential to deformation.

Analysis of clay improvement as subgrade using Palm Oil Fuel Ash (Pofa)

“…It is because soft clay has low shear strength, low California Bearing Ratio (CBR) values, and considerable potential for shrinkage. Soft soils are often found on the east coast of the island of Sumatra and some parts of the west coast of Sumatra island [1,2]. Soil serves as a pedestal to accept the load from the construction of the building and forward it to the subgrade layer, so the subgrade must be able to bear the given load so that there is no construction failure on it.…”