Tunnelling and TBM Expert Witness
Independent Tunnelling and TBM Expert Witness services for tunnelling, shaft and tunnel boring machine projects across the UAE and Middle East.
Tunnel boring machine (TBM) operations sit at the technical heart of several of the UAE's largest current infrastructure programmes — from the Dubai Metro Blue Line to the Strategic Sewerage Tunnels and Abu Dhabi's STEP wastewater network. Tunnelling disputes are among the most technically specialised in construction law, requiring experts who genuinely understand ground behaviour, TBM performance data and geotechnical risk allocation.
Active UAE Tunnelling Programmes
The Dubai Metro Blue Line's tunnelling works were formally launched in May 2026, when Sheikh Mohammed bin Rashid Al Maktoum activated the project's first TBM to begin excavation of a 15.5km underground corridor beneath challenging creek-side geology — with the first phase of tunnelling completed by July 2026. The project's precast segment production is supported by dedicated ready-mix concrete batching plants producing up to 12 tunnel rings per day at the International City facility.
In parallel, Dubai's Strategic Sewerage Tunnels project will involve construction of deep gravity sewer tunnels as part of a US$22 billion programme, while Abu Dhabi's STEP network already comprises 41km of deep gravity sewer tunnel engineered for a 100-year design life. Sharjah's Al Taawun corridor redevelopment includes a 500-metre road tunnel beneath the Al Taawun Roundabout, and Dubai's Trade Centre Roundabout Development includes three tunnels totalling 1,100 metres, illustrating how tunnelling has become a mainstream technique across transport, wastewater and utility infrastructure in the UAE — not just a specialist rail application.
Where Tunnelling Disputes Arise
- Ground condition and geotechnical risk disputes, particularly around unforeseen soil, rock or groundwater conditions differing from geotechnical baseline reports.
- TBM performance and downtime claims, requiring detailed technical analysis of advance rates, breakdown data and standby claims.
- Settlement and third-party damage claims, where tunnelling beneath live roads, buildings or existing utilities causes ground movement disputes.
- Delay and disruption claims on multi-tunnel programmes, where segment production, logistics and shaft access all affect critical path.
Our Tunnelling & TBM Sector Capability
Our structural and geotechnical experts provide independent technical opinion on tunnelling disputes, applying FIDIC contract analysis (including the Emerald Book where relevant to underground works), SCL Protocol delay methodology, and recognised geotechnical baseline report principles. Reports meet IBA Rules and CIArb Protocol standards for DIFC Courts, DIAC, ADCCAC and ADGM Courts.
Contact us to discuss expert witness support for a tunnelling or underground construction dispute.
Discuss Your Matter With Us
Forward a concise brief of your matter to us. We shall respond promptly and with discretion.
Frequently Asked Questions
- What role does a Tunnelling and TBM Expert Witness play in complex Middle Eastern arbitration?
- A Tunnelling and TBM Expert Witness provides critical technical evidence in high-stakes disputes under DIAC or arbitrateAD rules. They analyse whether tunnelling difficulties, such as those encountered in the varied lithology of the UAE or Saudi Arabia, stem from poor workmanship or genuinely unforeseen physical conditions. Their expertise ensures that the tribunal understands the mechanics of TBM performance and contractual risk allocation.
- How do your experts assess productivity claims related to TBM advance rates in the GCC?
- Our experts evaluate advance-rate productivity by comparing actual progress against the baseline programme and geotechnical reports. In the GCC context, this often involves assessing the impact of hyperbaric interventions or abrasive strata on cutterhead wear. By applying the SCL Delay and Disruption Protocol, we distinguish between contractor-driven delays and owner-responsible events, ensuring a robust and impartial quantification of time and cost impacts.
- Why is independent technical analysis vital for disputes involving unforeseen ground conditions?
- Under FIDIC contracts common in the Middle East, particularly the Red and Emerald Books, Clause 4.12 claims regarding ground conditions are frequent. An independent Tunnelling and TBM Expert Witness determines if a competent contractor could have reasonably foreseen the sub-surface environment. This analysis is crucial for resolving disputes over additional costs arising from unexpected groundwater ingress or differing soil profiles in urban projects.
- Can your firm provide expert testimony for tunnelling litigation in ADGM and DIFC courts?
- Yes, our experts are experienced in providing oral and written testimony within the common law frameworks of the ADGM and DIFC courts. We adhere to the highest standards of the RICS and the Academy of Experts, ensuring that our evidence is transparent, independent, and focused on the technical nuances of tunnel boring machine operations and shaft construction specific to the region.
- Where does the expert’s focus lie when investigating settlement damage in urban infrastructure projects?
- The focus lies on the correlation between TBM face pressure management, grouting records, and observed surface deformation. In densely populated GCC cities, we investigate whether the contractor adhered to the project’s Code of Construction Practice. We analyse ring build quality and monitoring data to establish whether settlement was an inevitable consequence of the design or a failure in operational execution and control.
- When should a legal team engage a Tunnelling and TBM Expert Witness during a dispute?
- Engagement should occur as early as the pre-action phase to ensure technical merits are accurately assessed before formal filing. Early involvement allows the Tunnelling and TBM Expert Witness to guide the discovery of project records and TBM data logs. This proactive approach helps legal teams formulate a clear strategy for adjudication or arbitration, potentially facilitating earlier settlements through credible technical reporting.
- If a TBM selection is questioned, how is the suitability of the equipment evaluated retrospectively?
- We conduct a forensic review of the Geotechnical Baseline Report against the TBM’s specifications, such as torque capacity, screw conveyor design, and cutterhead configuration. By examining historical operational data from projects across Qatar and the UAE, we determine if the chosen machine was fit for purpose or if mechanical failures were inherent to selecting an inappropriate TBM for the local geological conditions.