Abstract
Designing a foundation needs to be done carefully because of its important function to supportthe upper structure, including the soil condition. The soil must be able to withstand the load which appliedabove it. Recently, a lot of construction was built in areas with an insufficient bearing capacity of soil due tothe limitation of the area. Therefore, It is needed to reinforce the soil and improve the bearing capacity byadding synthetic materials, such as geogrid. In this study, sand soil with a relative density of 80% will betested under several variations in the length of the foundation (L) and vertical spacing between geogrid layers(h). The tests were carried out in the laboratory using rectangular footing with 10×12 cm, 10×14 cm, 10×16cm in sizes and vertical spacing between geogrid layers 1 cm, 2 cm, 3 cm. The loading test was carried outusing hydraulic jack and load cell on the model with eccentricity (e) 1 cm and the number of geogridreinforcement (n) 3 layers. To observe the settlement that occurs, the value of the digital dial gauge was readevery 50 kilos. The reinforced models, both L and h variation, showing the greater value of bearing capacitythan the unreinforced model. Based on the analysis results, the test model produces the maximum of BearingCapacity Ratio (BCR) 1.75 when the dimension of the rectangular footing is 10×12 cm and vertical spacingbetween geogrid layers is 3 cm.
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