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The stability of a structure is not only determined by the upper structure which directly bears the burden on the structure, but the stability of the lower structure in this case the foundation and capability of the subgrade support all loads to be very important. Good and accurate soil investigations are needed to calculate soil stability. Adequate soil investigations will not cause the estimated carrying capacity to be too low or high of foundation capacity. Design becomes uneconomical and recommendations given cannot be accepted in the worst conditions and even failures. Recently, one PLTG in Gorontalo was built with one operational support facility in the form of an oil tank. Investigation of soil in the oil tank area shows that the dense layer is at a depth of 2.5 meters below the ground level, and a solid layer is at a depth of 16 meters. This study aims to evaluate the behavior of soils on carrying capacity and permissible decreases of 100 mm. The analysis uses the finite-element method by the help of Plaxis. The analogy approach is done by modeling the structure, foundation and soil coating load based on foundation conditions and CPT data. The results of the analysis show that the carrying capacity of rolling and sliding is quite safe. Decrease in foundation subgrade meets the specified criteria so that the foundation soil is stable enough to support static and dynamic loads.

Behavior of Foundation Subgrade at Maleo PLTG Tanks Based on CPT Data