Analisis Daya Dukung Aksial dan Penurunan Pondasi Bored Pile Ø 80 Cm dengan Menggunakan Uji Beban Statik dan Menggunakan Metode Elemen Hingga pada Pembangunan BRI - Medan

Abstract

Bored pile foundations are critical structural elements for supporting building loads. Prior to implementation, testing is required to determine axial bearing capacity, settlement, and other parameters affecting foundation performance. This study aims to analyze the axial bearing capacity and settlement of an 80 cm diameter bored pile on the BRI Tower-Medan project. The methods used include static load test data analysis, numerical simulation using PLAXIS 3D software, as well as data from Standard Penetration Test (SPT) and cyclic loading test. The analysis results show that the ultimate axial bearing capacity (Qu) of a single bored pile based on the Reese and Wright method is 541.3 tons. Based on the loading test, the interpreted Qu values are 492.0 tons using the Davisson method, 500.0 tons using the Mazurkiewich method, and 416.7 tons using the Chin method. From the PLAXIS 3D simulation with Hardening Soil model, the interpreted Qu values are 540.0 tons (Davisson), 575.0 tons (Mazurkiewich), and 476.2 tons (Chin). With the Mohr-Coulomb model, the interpreted Qu values are 520.0 tons (Davisson), 540.0 tons (Mazurkiewich), and 500.0 tons (Chin). Settlement values based on the Poulos & Davis method are 11.6 mm, while those from the loading test are 6.13 mm, from PLAXIS 3D with Mohr-Coulomb model 8.15 mm, and with Hardening Soil model 6.11 mm. The lateral bearing capacity based on the Broms method is 34.62 tons. The conclusion of this study shows that the ultimate bearing capacity values obtained from the loading test, PLAXIS 3D simulation, and analytical methods are comparable. The settlement values differ but remain within the 25 mm tolerance limit, indicating that the foundation can be considered suitable for supporting the intended loads.