Brierley Associates is a privately-held national tunnel, trenchless, geo-structural and geotechnical design firm with offices strategically located across the United States. With over 80 underground  engineers and geologists, Brierley Associates delivers recognizable value to our clients by providing cost effective and constructable solutions for underground and heavy civil infrastructure projects.

Our team understands that planning, design, and construction of subsurface projects is a complex mixture of client needs, contractual preferences, risk allocation, third party requirements, design criteria, and subsurface conditions.

Brierley Associates’ nationwide and international underground project knowledge-base is key to anticipating ground behavior and helping our clients with design and construction of successful projects, which is the cornerstone of Brierley’s business vision to…“Create Space Underground”.

Press Room

Checkout out our Press Room for past issues of our In Depth Newsletter and published papers and articles.

Brierley Associates Sponsors ASCE Geotechnical Symposium

SR 99 – Bertha Access Shaft Topic of Presentation ASCE Mohawk-Hudson Section will hold their annual Geotechnical Symposium on November 13th, 2015 at Rensselaer Polytechnic Institute in Troy, NY. Brierley Associates is a Gold Sponsor of this annual event. You can learn more about the event by

Brierley Associates Proudly Sponsors Tunneling Short Course

  AJ McGinn,PhD will be the Instructor for Box Tunnel Design during this  Wednesday’s  Session at the Short Course. Topics covered will include box tunnel construction “Push or Pull” and other options, ground behavior and face control. AJ will also present a case study on the Twin

September 2015 “InDepth” Newsletter

This issue of “InDepth” features: The recently completed inspection and repair of the Linnwood water supply tunnel in Milwaukee, WI.  Also, Mohamed Gamal,PhD writes about  numerical modeling and  its application to develop efficient, effective and constructible designs.  In this issue, Brierley Associates welcomes Charles Luxford to our

Brierley Associates Update

Brierley Associates extends our best wishes to Ray Henn in the founding of RW Henn LLC, effective September, 2015.  Ray has been an important part of Brierley Associates for the past 5 years.  We appreciate the mentoring that he has provided our staff in the Denver office;

Ray Henn to lead I-70 Twin Tunnels Tour

Twin Tunnels Tour – Monday September 21, 2015 Ray Henn, PhD –  in conjunction with Colorado Department of Transportation will lead a bus tour to the I- 70 Twin Tunnels.The Eisenhower-Johnson Memorial Tunnels are dual-bore, four lane vehicular tunnels approximately 50 miles west of Denver. At an