BEARING CAPACITY IMPROVEMENT OF SHALLOW FOUNDATION ON MULTILAYERED GEOGRID REINFORCED SAND

Abstract

 Low bearing capacity of the soil causes failure of the foundation. Ones of soil types that has
low bearing capacity is sand. Geogrid is used to increase bearing capacity of the sand by interlocking its
particle, it also increases the tensile strength of the soil. Soil reinforcement using geogrid is effective, low
budget, and has simple installation method. Therefore, it is needed to do sustainability research to know the
variable that can increase the bearing capacity of loose sand optimally. This study is measuring the failure
mechanism on bearing capacity and the settlement of footing using hydraulic jack and dial LVDT. Each
model of footing with be conducted under some of different variable. This study used a variation of the ratio
the distance between geogrid with width of the footing (h/B) of 0.2; 0.25; 0.3, and the ratio of first layers of
geogrid with width of the footing (u/B) 0.3; 0.4; 0.5. The footings’ size that used are 12x12 cm and 12x24
cm. The footings would be tested in depth 0.3B with 3 layers of geogrid. According to the results under
variation of the distance between the geogrid (h), the larger value of h/B then the bearing capacity of sand
tends to decline, so that the maximum value for h/B generated is when h/B of 0.2. As for the variation of the
distance of the first layer geogrid (u) get that the maximum value at this variation is obtained when the value
u/B is 0.3.