Evaluation of inclined piles due to driving in soft soil

¹ Department of Civil and Environment Engineering, Faculty of Engineering, Universitas Gadjah Mada, Yogyakarta 55281, Indonesia
² Directorate General of Construction Development, The Ministry of Public Works and Housing, South Jakarta 12110, Indonesia

^* Corresponding author: sito.ismanti@ugm.ac.id

Abstract

The foundation of a water tank construction project experiences an inclined at the piles during construction. The construction location is in an area with soil type that can be categorized as soft clay. After a boring test was carried out, it was discovered that the depth of the soft clay soil reached 58 meters before solid sand was found. The aim of this research is to evaluate whether the inclined piles are still able to withstand the axial load that occurs. Analytical method analysis shows that the axial bearing capacity of the pile is 1177.85 kN, then the maximum axial load that occurs is 436 kN. Analysis using RS Pile shows that piles inclined at 5⁰ with alpha angles of 0⁰ and 90⁰ produce pile deflection values of 51.5 mm and 54.2 mm, respectively. At the same inclined angle but with different alpha angle, deflection becomes smaller, (-) 16.6 mm and 20.1 mm respectively at alpha angles of 1800 and 2700. It can be concluded that the lateral bearing capacity of the pile increases are not occur at all angles of inclination, but the direction of force that occurs under the existing load must also be considered.