Vidianos Roussos is the Managing Partner and Co-Founder of RNR Engineers, with more than 24 years of professional experience in geotechnical engineering, tunnel engineering and underground infrastructure.
His professional expertise focuses on geotechnical assessment, rock mechanics, tunnel engineering, deep excavations and technical support for complex infrastructure projects. Throughout his career, he has been involved in the planning, design, independent review and construction support of major infrastructure projects in Greece and abroad, covering every stage of the project lifecycle—from ground investigations and feasibility studies to detailed design, construction support and the assessment of existing infrastructure.
He believes that successful engineering solutions are not defined solely by accurate calculations, but by a thorough understanding of ground behaviour, engineering geology, construction methodology and the specific challenges of each project. His approach combines analytical design with engineering judgement developed through continuous involvement in construction projects and close collaboration with multidisciplinary engineering teams.
Areas of Expertise
- Geotechnical Engineering
- Tunnel Engineering
- Underground Structures
- Rock Mechanics & Engineering Geology
- Deep Excavations & Earth Retaining Systems
- Numerical Modelling & Geotechnical Analysis
- Design Review & Independent Checking
- Construction Support
- Tunnel Inspection & Condition Assessment
- Geotechnical Risk Assessment & Value Engineering
Education
Master of Science (MSc)
Design and Construction of Underground Works
National Technical University of Athens (NTUA)
Diploma in Mining and Metallurgical Engineering
National Technical University of Athens (NTUA)
Professional Experience
Vidianos has contributed to the design, technical review and construction support of major infrastructure projects in Greece and internationally, collaborating with public authorities, international engineering consultancies and contractors.
His experience includes metro systems, railway and road tunnels, hydraulic works, deep excavations, foundations, ground improvement, rock slope stabilisation and the technical assessment of existing infrastructure.
Selected Projects
- Athens Metro – Line 4 (Greece)
- Thessaloniki Metro (Greece)
- Copenhagen Metro – Cityringen (Denmark)
- Sotra Link Project (Norway)
- Durrës – Rrogozhinë – Pogradec Railway (Albania)
- Railway Corridor VIII (North Macedonia)
- Seich Sou Tunnel – Egnatia Motorway (Greece)
- Lysimachia Hydraulic Tunnel (Greece)
- Stavros Niarchos Foundation Cultural Center (Greece)
Technical Expertise
- Geotechnical Design
- Tunnel Engineering
- Rock Mechanics
- Engineering Geology
- Numerical Modelling
- Ground Improvement
- Design Review
- Construction Support
- Tunnel Inspection & Condition Assessment
- Geotechnical Risk Assessment
- Value Engineering
Professional Memberships
- Member of the Technical Chamber of Greece (TEE)
- Member of the Greek Tunnelling Society (GTS)
- Holder of a Greek Public Works Design Licence in Geological Studies and Geotechnical Studies
Engineering Philosophy
"Successful geotechnical engineering is not achieved through numerical analysis alone. It requires a thorough understanding of ground behaviour, engineering geology and construction methods, transforming complex technical data into solutions that are safe, practical and economically efficient."