• DFI Europe
  • DFI Trust

Anchored Earth Retention

A joint ADSC-DFI committee of industry-wide professionals who design, construct and supply equipment for temporary and permanent support of retaining structures using ground anchor techniques, such as tiebacks and soil nails. The committee visits the state of practice regularly through seminars and workshops, reviews and prepares guidance documents and specifications, and conducts practice-oriented research projects that advance the industry.

Committee Co-chair

Ed Laczynski, P.E.
Wagman Heavy Civil

Ed holds degrees from Virginia Tech and George Washington University, and professional engineering licenses in several states.  He is Vice President of Geotechnical Construction for Wagman Heavy Civil, a large general infrastructure contractor.  Ed performs in house deep foundation work for the Heavy Highway and Building companies, and he manages Wagman’s work as a foundation and specialty geotechnical subcontractor.  His background is in design/build, temporary and permanent anchored retaining systems, and foundation systems.

Committee Co-chair

Jeff Segar, P.E., S.E.
GeoStabilization International

After two decades as a consultant Jeff joined GeoStabilization International (GSI) where he is a Deputy Chief Engineer. He has been the Engineer of Record and responsible for project related design and production of construction documents for many types of structures and geostructures.  He currently provides GeoStructural engineering services for support of excavation, slope stabilization, soil nailing, and micropiles. Jeff currently serves on the board of directors for ADSC: the International Association of Foundation Drilling.


Hollow Bar Task Force

Jointly with ADSC-DFI Micropile Committee to define the state-of-practice for hollow bar elements and seek acceptance for use in highway projects.

Allowable deflection temporary and permanent systems

Summarizing and exploring the significance of the numerous and various movement tolerances for earth retention systems.

Coming soon.

Flow rate on bond stresses

Field test study aimed at understanding the effect of flow rate on bond dress in hollow bar elements.

Coming soon.

S3: Slope Slides and Stabilization

One of the lead committees for this conference and software discussion held annually on the effective application of deep foundations, ground improvement, and soil mixing for stabilization of slopes and excavation support. Links to software discussion videos.


FHWA Geotechnical Engineering Circular No. 7 Soil Nail Walls – Reference Manual – document presents information on the analysis, design, and construction of permanent soil nail walls in highway applications.

FHWA Geotechnical Engineering Circular No. 4 Ground Anchors and Anchored Systems – state-of-the-practice information on the design and installation of cement grouted ground anchors and anchored systems for highway applications.

Post Tensioning Institute, Recommendations for Prestressed Rock and Soil Anchors – practical guidance for the design, installation, and testing of prestressed rock and soil anchors.

GeoConstructability – An Owner’s Guide to Obtaining Essential Geotechnical Information for Construction (documents the type of geotechnical information  that contractors need to estimate, plan and execute foundation projects).