Analisis penurunan 1-dimensi fondasi tiang pancang pada bangunan Gedung Tower Pendidikan di Surabaya

The construction of high-rise educational buildings in Surabaya requires reliable foundation design, particularly under soft soil conditions, to ensure safety and serviceability performance. This study evaluates the settlement behavior of a pile foundation system supporting an Educational Tower Building in Surabaya based on total settlement and differential settlement analyses in accordance with SNI 8460:2017. A one-dimensional (1D) settlement analysis was conducted using secondary soil investigation data, including Standard Penetration Test (SPT) results, to determine soil parameters. Total settlement was calculated as the sum of immediate, primary consolidation, and secondary consolidation settlements, while differential settlement was evaluated through angular distortion along selected building sections. The results indicate that the average and maximum total settlements, 154.058 mm and 241.106 mm respectively, are below the allowable limit of 305 mm, satisfying the serviceability requirements for total settlement. However, the angular distortion analysis shows that several foundation segments exceed the serviceability limit of 1/300 specified in SNI 8460:2017. Despite this, most values remain within the damage threshold of 1/150, with only one point exceeding this limit. Therefore, although the pile foundation system does not fully meet the serviceability criteria for differential settlement, it is considered structurally safe against severe soil deformation.