Manhattan Tower Lagos Nigeria
Project Overview
GeoStruXer was tasked with evaluating foundation options for the Manhattan Tower, an 18-storey residential building in Lagos, Nigeria. The study focused on designing an optimised foundation system by evaluating standalone raft foundations, deep pile foundations, and a hybrid solution combining piles with a raft. The objective was to achieve an efficient, cost-effective, and stable design tailored to the site’s challenging geotechnical conditions.
Challenges
Solution Approach
Raft Foundation Evaluation
A 1m thick raft was assessed using advanced 3D finite element analysis (FEA) for soil–structure interaction (SSI), revealing significant deformations and prompting alternative solutions.
Deep Pile Foundation Assessment
Pile capacity was evaluated using Meyerhof’s method, incorporating geotechnical data and pile load tests, with a maximum capacity of 4,407 kN tested per ASTM D1143 standards.
Optimised Hybrid Solution
A combined pile and raft system was designed to optimise layout and reduce costs, ensuring stability and safety.
Value Engineering & Sustainability
Cost–Effective
Replaced conservative raft and deep pile options with a hybrid system tailored to local soil conditions.
Enhanced Performance
Used advanced soil models (Hardening Soil and HSsmall) to refine parameters and improve design accuracy.
Sustainability
Reduced material usage and environmental impact by optimising pile placement and adopting continuous raft concepts over pile caps.
Collaboration
GeoStruXer collaborated with Solidar Construction Limited to provide actionable insights and recommendations. Stakeholder feedback was integrated to align the design with project goals and site-specific challenges.