Analysis of the impact of cement deep mixing columns on reinforcement efficiency in deep excavations in Ho Chi Minh City

Abstract

Ho Chi Minh City is experiencing rapid urbanization, leading to an increased demand for underground infrastructure such as basements, parking lots, and shopping centers in areas with weak geological conditions, necessitating effective technical solutions to ensure safety and stability in deep excavations. This study uses Finite Element Modeling (FEM) to analyze the impact of Cement Deep Mixing (CDM) piles on the reinforcement effectiveness of soft soil at the River Panorama Block 7 & 8 project in District 7, Ho Chi Minh City, with the aim of determining the optimal reinforcement range to stabilize the structure and optimize construction costs. Results indicate that the optimal reinforcement range for CDM piles is between 0.3 and 0.4 times the excavation width, ensuring displacement and internal force parameters within permissible limits, thus reducing construction costs and time while maintaining reinforcement effectiveness. These findings can be applied to similar projects in weak soil conditions.