SPACING EFFECT ON PILED-RAFT AND PILE GROUP FOUNDATION WITH FINITE ELEMENT METHOD

• Main Author: Rizqi Pasca Aquila, Gunadi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74156
• Institution: Institut Teknologi Bandung

Based on data from the Badan Pusat Statistik (BPS), Indonesia's population is projected to reach 275.77 million people in 2022. This number increased by 1.13% compared to last year's 272.68 people. As Indonesia's population increases, the availability of land becomes limited. This can have an impact on foundation design, especially in terms of reducing the distance between deep foundations or piles. Therefore, this research final project aims to determine the effect of spacing on piled-raft and pile group foundations if the spacing used is smaller than the minimum distance recommended by SNI 8460: 2017 which is 2.5 times the pile diameter. In this final project research, there are three main focuses on the impacts caused by spacing differences, namely the bearing capacity of piled-raft and piled group piles, group foundation settlement, group lateral deflection, and load distribution received by the piles that make up the foundation. Using soil data obtained from the planning of Gade Tower in Central Jakarta, the soil modeled in Midas GTS NX software will be calibrated with Static Loading Test (SLT) testing in the field. The spacing variations used in this study are 2D and 3D spacing. In addition, variations in the configuration and number of piles are also one of the additional variables. The configurations used are 2x1 (2 piles) and 2x2 (4 piles). Analysis of the effect of spacing and number of piles was carried out using software from Midas GTS NX 3D to calculate the calibrated bearing capacity, group foundation settlement, group lateral deflection, and load distribution received by the pile and pilecap. The 3D spacing between piles causes the bearing capacity of the pile group to be greater than 2D. This is due to the greater efficiency of the pile because the stress distribution in 3D spacing is wider when compared to 2D. The stress distribution at the contact between the soil and the pile also affects the settlement and lateral deflection that occurs. Since the stress distribution in 2D spacing is not spread more evenly like 3D, there are more stress distributions that overlap between one pile and another. Therefore, the settlement and lateral deflection at 2D spacing is greater when compared to 3D spacing. The load distribution received by the pilecap in 2D spacing is also greater than that in 3D spacing.