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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.

Avoiding Problems with HDD Projects related to Soil and Bedrock Abrasion

By Nick H. Strater, P.G., Brian C. Dorwart, P.G., P.E., and Jim Williams, P.E. Successful trenchless horizontal directional drilling (HDD) installations require thorough and accurate subsurface investigation and characterization for the development of the drill geometry, to estimate the project cost and schedule, and for selection of

Austin Capital Complex Project Featured in ENR

Brierley Associates provided final detailed design of the entire Phase 1 retention system for the Capital Complex project in Austin, TX, an approximately 40-to 65-ft deep, 500,000+ CY excavation through overburden and limestone bedrock  As the project is within a dense urban setting, significant coordination with adjacent

Deep Foundations Pose Challenges in Tight Downtown Areas

Brierley’s trestle designs help builders construct deep excavations by David Berti, Senior Consultant Construction in dense urban areas like San Francisco and Los Angeles pose unique challenges for shoring and excavation. Urban center constraints like walkways, roads, utilities, adjoining buildings, and subways are used by thousands of