Effects of jet grouting on the performance of braced retaining wall

• Main Author: Tan, Yih Keng.
• Other Authors: Goh Teck Chee, Anthony
• Format: Final Year Project
• Language: English
• Published: 2012
• Subjects: DRNTU::Engineering::Civil engineering::Geotechnical
• Online Access: http://hdl.handle.net/10356/49230
• Institution: Nanyang Technological University

This project studies and reports on the performance and behavior of braced excavation under the presence of jet grout piles. Two-dimensional analyses were carried out with the help of finite element software PLAXIS 2D. The analyses were carried out for a 20 m deep excavation in clay supported by a 26 m long wall. A total of 108 different cases were considered where the presence and thickness of the jet grout piles were varied. Varying excavation widths, wall stiffness and clay undrained shear strength were also considered. Comparisons of the retaining wall deflections, wall bending moments, strut forces, basal heave safety factor and plastic points patterns were carried out. In general, jet grouting performs more effectively in low strength soil compared to high strength soil. Results indicate that the presence of jet grout effectively reduces the wall deflection especially for retaining walls with lower stiffness. Strut forces on the other hand are more effectively reduced for struts closer to the formation level than struts close to the ground surface.