Vojtech Gall, Ph.D., P.E.

principal_gall_mainVirginia, Headquarters
44345 Premier Plaza, Suite 210
Ashburn, Virginia 20147
Phone +1-703-726-2700 / Fax +1-703-726-6999



Dr. Gall has over twenty-five years of experience in the design, construction, and construction management of tunnels and underground structures.  His expertise encompasses soft-ground, mixed-face, and rock-tunneling for transit structures in urban settings utilizing TBM, conventional tunneling (SEM/NATM), and cut-and-cover techniques frequently employing ground improvement measures to facilitate mined tunneling by means of grout injections, specialty fore-poling systems and ground freezing.  He frequently serves on expert review panels dedicated to the investigation and improvement of tunneling schemes ranging from initial inception stages through final design development at bid document level.  His peer review services relate to a wide variety of facilities ranging from hydro-power schemes in remote settings to complex transit structures at shallow overburden in difficult, over-built urban settings.


  • Ph.D., Civil Engineering, University of Maryland
  • M.S., Mining Engineering, University of Alabama
  • M.Sc., Civil Engineering, Technical University (RWTH) Aachen, Germany

Professional Registrations

Professional Engineer in Kentucky, Florida, District of Columbia, Ohio, California, Colorado, Illinois, Michigan, North Carolina, New Jersey, New York, Maryland, Texas, Washington, Massachusetts, Alaska, Pennsylvania, and Virginia


  • International Tunneling Association
  • American Society of Civil Engineers
  • Society for Mining, Metallurgy, and Exploration, Inc.
  • American Concrete Institute
  • American Underground Construction Association
  • Disputes Review Board Foundation
  • American Rock Mechanics Association
  • International Society for Rock Mechanics

Notable Projects

East Side Access Tunnel, New York, 2001-present

University Link, Seattle, Washington, 2011-present

Port of Miami Tunnel, Miami, Florida, 2011-present

Medical Center Cross-over Tunnel, District of Columbia, 2011-present

MetroLink Cross County Extension, St. Louis, Missouri, 2011-present

China Town Station, Central Subway Project, San Francisco, California, 2010-present

Raccoon Mountain Pumped Storage Plant (PSP), Chattanooga, Tennessee, 2010-present

Caldecott Tunnel, Oakland, California, 2008-present

Zimmerman Trail Tunnel, Billings, Montana, 2011

South Ferry Terminal-Waterproofing Leakage Assessment, New York, New York, 2008-2010

Trans-Hudson Express (THE) Tunnels, New York-New Jersey, 2006-2010

SR 520-Bridge Replacement Study, Montlake, Washington, 2008

Crossrail, London, U.K., 2006-present

Devil’s Slide Tunnel, San Bernardino, California, 2006-2010

Beacon Hill Station, Running Tunnels and West Portal Wall, Seattle, Washington, 2005-2007

Dulles Corridor Metrorail Project, Vienna, Virginia, 2004-2011

Fort Canning Tunnel and Realignment of Stamford Road, Singapore, 2004-2006

Dulles Airport Automated People Mover System, Virginia, 2003-2010

Weehawken Tunnel and East Portal Shotcrete Value Engineering Change Proposal (VECP), New Jersey, 2003-2005

King’s Cross Station Redevelopment, London, U.K., 2002-2007

PATH Tunnel Rehabilitation, New York – New Jersey, 2002-2003

Bergen Tunnels Rehabilitation, New Jersey, 2001-2002

Russia Wharf Tunnel Segment, Boston, Massachusetts, 1998-2004

East London Line Thames Tunnel, London, U.K., 1996-1998

WMATA Red Line Tunnels and Stations, Mid-City E-Route, Branch Avenue, District of Columbia, 1994-2001

Berry Street Tunnel, Pittsburgh, Pennsylvania, 1996-1997

Kaoshiung-Pingtun Tunnels, Second Freeway Project, Taiwan, R.O.C., 1992-1993

City Place Station and Running Tunnels, Dallas, Texas, 1992

Technical Papers

Dr. Gall has authored and co-authored over fourty technical publications on tunneling, waterproofing of underground structures, instrumentation and monitoring, tunnel rehabilitation and the implementation of new tunneling technologies.  Selected publications include:

“Real-Time Monitoring for Very Shallow Tunneling in Urban Settings.” 2012 North American Tunneling Conference Proceedings, June 24-27 (with Rudolf, J., Betit, J., Leputsch, R. and O’Brien, T.)

“Considerations for Very Shallow Conventional (SEM) Tunneling in Urban Settings.” 2011 RETC Conference, June 19-22. (with Rudolf, J. and O’Brien, T.)

“Quality and Risk Management Considerations for Very Shallow Soft Ground Conventional Tunnelling in Urban Settings.” 2011 World Tunnel Congress and 37th ITA General Assembly, May 20-26. (with Soe Oo, Z.)

“Examination of Shotcrete Liner at Devil’s Slide Tunnel Utilizing ASTM 1550 Field Test Results and Back Analysis.” 44th US Rock Mechanics Symposium and 5th U.S.-Canada Rock Mechanics Symposium.” June 27-30, 2010. (with Decker, J. B. and Madsen, P. H.)

“Implementation of Conventional Tunneling in a Design-Build Contract in the US.” 2010 World Tunnel Congress and 36th ITA General Assembly, May 15-20, 2010. (with Rudolf, J. and O’Brien, T.)

“Past and Present Soft Ground NATM for Tunnel and Shaft Construction for the Washington, D.C. Metro, 2010 North American Tunneling Conference.” June 20-23, 2010. (with Rudolf, J. and O’Brien, T.)

“Design Guidelines for Sequential Excavation Method (SEM) Practices for Road Tunnels in the United States.” 2010 North American Tunneling Conference, June 20-23, 2010. (with Munfah, N.)

“Modeling of Pipe Arch Canopies in Shallow Soft Ground Tunnels Constructed by Sequential Excavation Methods.” 2nd International Conference on Computational Methods in Tunneling, Bochum, Germany, September 9-11, 2009. (with Nitschke, A. and Ahuja, V.)

“History and Recent Developments in Soft Ground NATM Tunneling for the Washington, DC Metro.”  World Tunnel Congress and 35th ITA General Assembly, Budapest, Hungary, May 23-28, 2009. (with J. Rudolf and H. Wagner)

“Experience with Synthetic Fiber Reinforced Initial Shotcrete Lining at the Devil’s Slide Tunnel Project.” Spritzbeton-Tagung, Alpbach, Austria, January 15-16, 2009. (with P. Madsen, J. Decker, K. Zeidler and T. O’Brien)

“Selection of Alignment and Tunneling Methods in Urban Settings.” World Tunnel Congress and 34th ITA General Assembly, Agra, India, September 19-25, 2008. (with A. Nitschke and J. Rudolf)

“The Dulles Corridor Metrorail Project–Tunneling Options for Tysons Corner.” North American Tunneling Conference, June 8-11, 2008. (with J. Rudolf)

“Pre-Support Measures for Shallow NATM Tunneling in Urban Settings.” with K. Zeidler, North American Tunneling Conference, June 8-11, 2008.

“The Dulles Corridor Metrorail and its Tunneling Aspects.” World Tunnel Congress and Third ITA General Assembly, May 5-10, 2007. (with K. Zeidler and J. Rudolf)

“NATM for Singapore.” North American Tunneling Conference, Chicago, Illinois, June 10-15, 2006. with T. (Schwind and Zeidler, K.)

“Shotcrete for Tunnel Final Linings–Design and Construction Considerations.” North American Tunneling Conference, Atlanta, Georgia, April 17-22, 2004. (with Zeidler, K., Munfah, N. and Cerulli, D.)

“Bergen Tunnels Rehabilitation–A Success After All.” Rapid Excavation and Tunneling Conference, New Orleans, Louisiana, June 16-18, 2003. (with Zeidler, K. and Mergentime, S.)

“Design Criteria for Large Tunnels in Soft Ground.” (with Zeidler, K.) International Conference on Tunnels and Underground Structures, Singapore, November 27-29, 2000.

“Frozen Ground for Building Support–Implementation of Innovative Engineering Concepts for Tunneling at Russia Wharf.” (with Urschitz, G. and  Zeidler, K.) North American Tunneling Conference, Boston, Massachusetts, June 6-11, 2000.

“Three Pillars for an Effective Waterproofing System.” North American Tunneling Conference, Boston, Massachusetts, June 6-11, 2000.

“Flexible Approaches for Urban Tunneling.” ASCE Met Section Construction Group Seminar on Innovative Construction Means and Methods, New York, New York, March 6-7, 2000.

“Construction of Miscellaneous Underground Structures for Subway Projects.” ASCE Met Section Seminar on State of the Art Technology in Earth and Rock Tunneling, New York, New York, May 26-27, 1999. (with Sauer, G. and Zeidler, K.)

“Shotcrete Lining Design Concepts for New and Rehabilitated Tunnels.” Shotcrete for Underground Support VIII, Campos do Jordao, Brazil, April 11-15, 1999. (with Zeidler, K.)

“Renovation of the Berry Street Tunnel.” Tunnels and Tunnelling International (London) 30 (April 1998). (with Claassen, M.)

“Rehabilitation Concepts for Brick Lined Tunnels in Urban Areas.” World Tunnel Congress, Sao Paulo, Brazil, April 25-30, 1998. (with Zeidler, K., Predis, T. and Walter, J.)

“Optimization of Tunnel Pre-Support: Softground NATM at Washington D.C. Metro’s Section F6b.”  North American Tunneling Conference, Newport Beach, California, February 21-25, 1998. (with Zeidler, K., Myers Bohlke, B., and Alfredson, J.E.)

“London Bridge Station, Jubilee Line Extension.” Rapid Excavation and Tunneling Conference, Las Vegas, Nevada, June 22-26, 1997. (with Zeidler, K.)

“Achieving Dry Cut-and-Cover Stations: A Membrane Based Waterproofing System for Underground Structures.” North American Tunneling Conference, Washington, D.C., April 21-24, 1996. (with Mergelsberg ,W. and Sauer, G.)

“Instrumentation and Its Implications: DART Section NC-1B, City Place Station, Dallas, TX.” North American Tunneling Conference, Washington D.C., April 21-24, 1996. (with Ugarte, E. and Sauer, G.)

“Lining the Line.” Civil Engineering Magazine (American Society of Civil Engineers) 66, No. 3 (March 1996). (with Mergelsberg, W. and Sauer, G.)

“Computer Calculations Speed Tunnel-Lining Design.” Civil Engineering Magazine (American Society of Civil Engineers) 64, No.7 (July 1994). (with Bauer, E. and Sauer, G.)

“Design of Tunnel Concrete Linings Using Capacity Limit Curves.” Eighth International Conference of the International Association for Computer Methods and Advances in Geomechanics, Morgantown, West Virginia, May 22-28, 1994. (with Sauer, G., Bauer, E., and Dietmaier, P.)

“The Doorframe Slab Method, Barrel Vault Method, and Conventional NATM Applied to the By-Pass at Oberrieden, Germany.” Rapid Excavation and Tunneling Conference, Boston, Massachusetts, June 13-17, 1993. (with Sauer, G. and Zeidler, K.)

“Effective Iterative Technique in Numerical Modeling to Simulate Progressive Failure in Underground Coal Mines.” 31st U.S. Symposium on Rock Mechanics, Colorado School of Mines, Denver, Colorado, June 17-20, 1990. (with Park, D.)

“Large Scale Three-Dimensional Numerical Simulation of Longwall Mining, Preprint 90-24.” The 119th SME Annual Meeting, Salt Lake City, Utah, February 26-March 1, 1990. (with Park, D.)

“Supercomputer Assisted Three-Dimensional Finite Element Analysis of a Longwall Panel.” 30th U.S. Symposium on Rock Mechanics, West Virginia University Morgantown, West Virginia, June 19-22, 1989. (with Park, D.)

“IBID (refereed Version), COGS Computer Contributions.” V 5, No. 2, August, 1989 Journal.

“Low Cost Automatic Data Acquisition and Analysis for Uniaxial Rock Testing.” Geotech 88, Lakewood, Colorado, October, 1988. (with Park, D. and Patton, S.)


Dr. Gall has lectured on tunnel design and construction as well as the implementation of modern tunneling techniques in urban settings. Representative lectures include:

“Case History: Tysons Corner Station and Tunnels.” Breakthroughs in Tunneling 2012, Colorado Schools of Mines, Golden, Colorado, September 19-21, 2012.

“Design and Construction of the Dulles Corridor Metrorail Project NATM Tunnels at Tysons Corner,Virginia.” 2012 North American Tunneling Conference, Indianapolis, Indiana, June 24-27, 2012.

“Waterproofing, Roofing and Heating Insulation AquaStop.” Keynote; “Achieving Dry Underground Space-A Strategic Approach,” Saint-Petersburg, Russia, May, 29-30 2012.

“SEM/NATM Tunneling in Design and Construction.” Kentucky Chamber of Transportation Tunneling Seminar, Frankfort, Kentucky, December 5- 6, 2011.

“Design and Construction of the Dulles Metrorail Project NATM Tunnels at Tysons Corner, Virginia.” British Tunnelling Society, Institution of Civil Engineers, London, U.K., November 17, 2011.

“Innenstädtischer Tunnelbau mit geringen Überdeckungen.” (Urban Tunneling with a Shallow Overburden), Forum Geotechnik, Rheinisch-Westfälische Technische Hochschule (RWTH) Aachen, Germany, November 19, 2009.

“Concrete Lining & Shotcrete Sequential Excavation (SEM) for Shaft Construction.” Shaft Design and Construction Short Course, Sponsored by the Underground Construction Association of SME, Atlanta, Georgia, September 10-11, 2009.

“Introduction to FHWA Road Tunnel Design and Construction Manual.” SEM Tunneling Workshop 133, Sponsored by the Tunnels and Underground Structures Committee, Transportation Research Board (TRB) 88th Annual Meeting, District of Columbia, January 11-15, 2009.

“Waterproofing of Underground Structures: An East Coast Perspective.” 2007 George A. Fox Conference: Waterproofing Shotcrete / Cast-in-Place Liners, New York City, New York, January 30, 2007.

“West Utility Building Tunnel–NATM at Washington Dulles International Airport, 2006.” George A. Fox Conference, New York, New York, January 24, 2006.

“State of the Art in the Application of Sequential Tunneling Methods (NATM).” Parsons Brinckerhoff Quade and Douglas New York Tunneling Seminar, Newark, New Jersey, June 14, 2005.

“Utilization of Lattice Girders in Underground Shotcrete Support,Engineering Assessment of Lattice Girder Options.” Presentation to American Commercial, Inc, Bristol, Virginia, October 1, 2002.

“Softground Tunnels for Transportation, Water and Wastewater Conveyance, Recent Innovations in the Science of Underground Development.” Annual Meeting of the American Association for the Advancement of Science, Boston, Massachusetts, February, 2002.

“Flexible Approaches for Urban Tunneling.” American Society of Civil Engineers Metropolitan Section Annual Seminar of the Construction Group, Innovative Construction Means and Methods, Cooper Union, New York, New York, March 6-7, 2000.

“NATM in Soft Ground for Big Dig.” American Society of Civil Engineers Annual Convention, Boston, Massachusetts, October 18-21, 1998.

“State-of the-Art in Design and Construction for Vehicular Tunnels.” Tunneling Seminar by Invitation of the Chilean Ministry of Public Works, Santiago, Chile, November 19-20, 1996.