Managing Complexity at Scale: Case Studies from Gotthard Tunnel and Zaha Hadid Tower

Through global engineering landmarks such as the Gotthard Base Tunnel and the iconic Zaha Hadid Tower in Milan, Vivek Ramesh, AGM Sales, Nemetschek, explores how the construction industry is redefining project delivery in an era of increasing scale, geometric complexity, and execution pressure. He highlights the growing role of integrated digital workflows, multidisciplinary coordination, and advanced engineering practices in enabling successful delivery of some of the world’s most challenging infrastructure and building projects.

Modern infrastructure and high-rise developments are pushing the boundaries of engineering, architecture, construction management, and execution planning. Whether working beneath extreme geological conditions or delivering architecturally complex structures within aggressive timelines, project teams today face unprecedented technical, logistical, and operational challenges.

Successfully managing such projects requires far more than conventional engineering approaches. Digital construction technologies, BIM-driven coordination, parametric modeling, and integrated project delivery systems are increasingly becoming essential for improving precision, reducing risks, optimizing workflows, and enabling collaboration across multiple disciplines and stakeholders.

As projects continue to grow in scale and complexity, the ability to integrate design, engineering, construction, and execution through connected digital ecosystems is becoming a critical factor in achieving faster, safer, and more efficient project delivery.

The following international case studies demonstrate how digital engineering, multidisciplinary coordination, and integrated project delivery practices are helping teams manage scale, complexity, precision, and execution risks across globally significant construction projects:

Gotthard Base Tunnel – Engineering the World’s Longest Rail Tunnel

Project Overview

The Gotthard Base Tunnel is the world’s longest railway tunnel (57 km).
It runs under up to 2,300 meters of rock, making it the deepest tunnel globally.
It connects Erstfeld to Bodio and has been operational since 2016.

Scale and Complexity

28.2 million cubic meters of rock excavated.
152 km of total tunnel tubes and 290 km of railway track installed.
Construction involved up to 2,400 workers working 24/7.

Engineering and Construction

80% tunneling achieved using Tunnel Boring Machines (TBMs).
TBMs were up to 450 meters long and 9.5 meters in diameter.
Remaining excavation carried out using controlled blasting.

Unique Challenges and Solutions

Extreme geology with varying rock conditions managed through adaptive TBM techniques.
Massive scale handled through continuous 24/7 operations and industrialized processes.
Safety ensured through twin-tube design and cross passages every 325 meters.
Cost and schedule risks controlled through strong governance and transparency.
Logistics of material excavation and installation handled through integrated workflows.

Benefits and Impact

Train speeds up to 200 km/h achieved.
Travel time between Zurich and Milan reduced by approximately 30 minutes.
Supports shift of transport from road to rail, improving sustainability.

How Digital Tech Helped

Projects like the Gotthard Tunnel highlight why modern infrastructure demands integrated digital design, coordination, and construction workflows—exactly where platforms like ALLPLAN add value by managing complexity, precision, and collaboration across the lifecycle.

Zaha Hadid Tower, Milan

Project Overview

The Zaha Hadid Tower, located in Milan’s CityLife district, is a landmark skyscraper with a distinctive twisting geometry. It rises to 170.36 meters and comprises 44 floors with 3 basement levels, covering approximately 70,000 m² of built-up area. The tower’s rotating floor orientation creates a visually striking and structurally complex form.

Key Challenges

Complex twisting geometry with varying floor orientations
Structural torsion caused by inclined external piers
High reinforcement requirements in core walls and slabs
Unique non-repetitive components complicating formwork and detailing
Deep foundation system with large load transfer
Aggressive construction timeline targeting one floor per week

Engineering Solution Approach

The project adopted a parametric and BIM-driven approach to manage complexity. Detailed 3D modeling was used to plan and validate structural and construction sequences in advance. Parametric planning helped simplify variables and ensure repeatable and optimized workflows.

Role of ALLPLAN

Advanced 3D modeling enabled accurate representation of complex geometry
Automated reinforcement detailing improved productivity
Parametric components (SmartParts) enabled efficient handling of unique elements
Clash detection minimized errors before construction
Improved coordination led to faster and more efficient execution

Project Outcomes

Successful delivery of a highly complex twisted skyscraper
Reduction in design errors and rework
Optimized construction workflows
Achievement of aggressive construction timelines
Demonstration of BIM-driven design and execution capabilities

Key Stakeholders

Architect: Zaha Hadid Architects
Client: CMB S.C.A.R.L
General Contractor: CityLife S.p.A.
Engineering Consultant: Redesco Progetti

How Digital Tech Helped

ALLPLAN enabled the successful execution of a geometrically complex high-rise through parametric modelling, advanced reinforcement detailing, and clash-free digital workflows. This resulted in faster construction cycles and reduced project risk.