DESIGN OF BORED PILE FOUNDATION AND SLOPE STABILITY OF BALANCED CANTILEVER BRIDGE STUDY CASE: DESIGN ALTERNATIVE FOR MAINROAD GLADAK BRIDGE

• Main Author: Zhafran Puturahmadika, Mahdy
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/77144
• Institution: Institut Teknologi Bandung

Gladak Mainroad Bridge is one of the sub-projects of the Yogyakarta-Bawen Toll Road Construction Project under Section 5: Ambarawa-Temanggung, which connects separate sections of the toll road separated by a slope with the Gladak River underneath. The purpose of this final project is to design a foundation system that can support the load of the superstructure and facilitate the stability of the existing slope, as well as the required excavations in construction by designing retaining walls. The foundation used in this final project is a bored pile foundation with a diameter of 1.8 meters and varying depths. The design analysis is carried out through axial load analysis of single and grouped piles, lateral capacity analysis of single piles using the LPILE software, lateral load capacity analysis of pile groups using the GROUP software, settlement analysis, and differential settlement between foundations. The reinforcement of the bored pile foundation and pile cap is designed using the spColumn software. The slope of the Mainroad Gladak Bridge is divided into two sections to facilitate slope stability analysis. Slope stability is facilitated by two different types of slope reinforcements: secant piles and soil nailing. Excavation and slope stability analysis are performed using the PLAXIS 2D software with the Mohr- Coulomb soil model. The excavation carried out to facilitate slope stability varies for each slope, adjusting to the contour of the soil for each slope. The analysis results for the left slope reinforcement are facilitated by secant piles with a depth of 20 meters and soil nailing with a depth of 10.75 meters. The analysis results for the right slope reinforcement are facilitated by secant piles with a depth of 13 meters and soil nailing with a depth of 8.8 meters. Soil nailing for both slopes is required along a length of 12 meters with a borehole diameter of 0.3 meters, reinforced by 35mm nail reinforcement. The face of the soil nailing is designed with a 0.3-meter-thick shotcrete wall reinforced with wire mesh.