ANALYSIS AND COMPARISON OF PILE BEARING CAPACITY BASED ON N-SPT, DYNAMIC METHOD, AND PILE DRIVING ANALYZER (PDA) IN MATARAMAN – SEI ULIN BRIDGE CONSTRUCTION PROJECT (MALI-MALI BRIDGE)

Abstract

Pile bearing capacity can be calculated using N-SPT and piling data. The dynamic formula which is often used for calculating the amount of pile capacity according to the general specifications of Bina Marga is the Hiley formula. The purpose of this study was to determine the bearing capacity of the pile based on the N-SPT data, the dynamic method in the form of the Hiley formula, and other formulations, along with their comparison to the results of the PDA test. The chosen research location was the Mataraman – Sei Ulin Bridge Construction Project (Mali-Mali Bridge). The calculation results for Hiley's formula show the average reduction factor was 74.71%, and SF = 1 to the PDA test results. From the analysis of calculations using N-SPT data using the Terzaghi, Peck, and Bazaraa methods, the magnitude of the frictional and end bearing capacity has the same tendency when compared to the PDA test. Namely, the end bearing resistance is greater than the frictional resistance. The corrected SF range for the end bearing resistance in the Terzaghi, Peck, and Bazaraa method is 2.33 – 3.82 and the Meyerhoff method is 2.21 – 3.51. The corrected SF range for frictional resistance in the Terzaghi, Peck, and Bazaraa method is 2,17 – 2.3 and the Meyerhoff method is 1.22 – 2.03. Of the 10 types of pile dynamic formulations, the method which is closest to the PDA test is the ENR, Sanders, and Rankine methods with reduction factors of 25.14%, 36.88%, and 42.65% and corrected SF, respectively. are 5.71, 5.7, and 4.15.

Keywords: Pile Driving Formula, N-SPT, PDA Test