Performance of excavation wall systems with jet grouting

• Main Author: Amirah Zubir
• Other Authors: Goh Teck Chee, Anthony
• Format: Final Year Project
• Language: English
• Published: 2015
• Subjects: DRNTU::Engineering::Civil engineering::Geotechnical
• Online Access: http://hdl.handle.net/10356/64118
• Institution: Nanyang Technological University

Underground construction is commonly the most practical option for many construction projects in Singapore. A deep understanding of the various factors involved in such a project is essential for engineers, from the soil behavior at the particular site to the behavior of the individual components involved in the construction of a retaining wall. In this study, a detailed analysis of the retaining wall behavior with jet grouting piles under excavation was performed. A finite element method was used to conduct a two dimensional analysis and generate numerical data from a permutation of variables; wall stiffness, jet grout depth and wall penetration depth, with respect to their effects on the maximum lateral wall displacement, maximum bending moment and strut forces. A total of 30 cases were simulated using finite element software PLAXIS 2D. The results generally revealed that a stiffer retaining wall of a thicker jet grout layer is more effective in minimizing lateral wall deflections, while also generating increasing bending moments in the wall and strut forces in the struts. The study goes further to analyses the implications of having a shorter wall penetration depth, and a two-layered jet-grout layer.