Small Diameter Geo-Support Design and Construction Seminar
Tuesday, November 13, 2012
7:00 am - 8:00 amBreakfast
8:00 am - 8:15 amIntroduction and Welcome
Dan Thome P.E., Nicholson Construction Company
8:15 am - 9:15 amKeynote: Development of Apparent Earth Pressure Diagrams
Dave Weatherby, Schnabel Foundation
Apparent earth pressure (AEP) diagrams are used for the design of excavation support systems and permanent tieback earth retaining walls. Published and commonly used AEP diagrams were developed from measured strut loads, and do not fit classical earth pressure theory. This presentation will focus on the development and the use of AEP diagrams.
9:15 am - 10:15 amCurrent Design and Performance of Anchored Earth Retention Systems
Daren J. Zywicki Ph.D., P.E., GEI Consultants, Inc.
The design and performance of anchored earth retention systems have undergone significant advances because of the desire and need to achieve deeper excavations, while simultaneously reducing wall deflections and ground settlement. The increased availability and practicality of numerical software packages and measurement systems have allowed earth retention system performance to be predicted and monitored more thoroughly than in the past. This presentation will discuss the current anchored earth retention design procedures, performance criterion, and performance monitoring systems. The presentation will include consideration of design lateral earth pressures, numerical methods for analyzing the structural system and soil-structure interaction, and innovations in sensors and information systems. The presentation will also consider the numerical and analytical methods utilized to estimate deflection and settlement, as well as the methods utilized to estimate potential structural damage of adjacent structures.
10:15 am - 10:45 amNetworking Break in Exhibit Area
10:45 am - 11:30 amCase History: Construction of Deep On-line Temporary Excavation Support for the Reston Station Project, Reston, Virginia
Robert Jakiel, Berkel & Company Contractors

The construction of a deep on-line temporary excavation support system for the Reston Station project in Reston, VA will be presented. The challenges for this project include the construction of an economical and accurate system of excavation support that could be used as the back form for the foundation walls of the 7-story below ground parking structure. Using pre-bored soldier piles, lagging, and tiebacks, the excavation support system was successfully installed to depths of about 85 feet around the perimeter (2,200 lineal feet) of this below ground structure (725'x350').
11:30 am - 12:15 pmTesting of Soil Nails and Ground Anchors
Thomas Richards Jr., P.E., D.GE, Nicholson Construction Company
This presentation will address many questions concerning the testing of anchors and soil nails including: Why do we do it? What are we supposed to do? What are we stressing? How do we do it in the field? What about wall movement? How do we judge if an anchor is acceptable? What is the apparent tendon length?
12:15 pm - 1:15 pmLunch in Exhibit Area
1:15 pm - 1:55 pmCase History: Comparison between the Deep Soil Mix & Soldier Pile and Lagging SOE
Rich Pratt P.E., Schnabel Foundation
Schnabel Foundation Company was the preferred bidder for the Square 537 Phase II project providing over 68,000 ft2 support of excavation with heights of up to 68 feet’ below four heavily traveled CSX railway lines. The design also supported a cut of 25feet below the adjacent 16-floor Marriott Residence Inn and included a water pressure surcharge which extended 28feet above sub-grade. Specialized equipment was necessary to install a water-tight earth retention system, which included deep mixing, jet-grouting and a secant wall in difficult soils. The earth retention system also included soil nailing, bracket piles, corner diagonal braces, and 539 tiebacks, 270 of which were located below the water table. Despite setbacks due to difficult soil conditions and buried man-made obstructions this project was completed in 8 months. The presentation will highlight construction challenges and system performance.
1:55 pm - 2:40 pmCase History: Diaphragm Wall for a Waterfront Property at Harbor East in Baltimore
Fred Tarquinio P.E., Nicholson Construction Company
Since the project site was approximately 20 feet from the edge of Harbor, structural support for this five-star waterfront resort with a five-story parking garage below the water table, required an anchored diaphragm wall for both excavation support and protection from seawater infiltration. The diaphragm wall was designed using fast-track project methods, meaning the design could not wait until test borings were drilled along the proposed wall alignment. Consequently, typical soil properties were selected for the Fill, Silty Organics, Cretaceous Sediments, and varying depth of Decomposed Rock for the design of the diaphragm wall. The construction schedule required the diaphragm wall contractor to complete the construction of the approximately 90,000 square ft wall and installation of over 600 tiebacks in 10 months.
2:40 pm - 3:20 pmNetworking Break in Exhibit Area
3:20 pm - 3:50 pmCase History: Challenges of the Unknown in Anchored Earth Retention
Morgan Eddy P.E., Steele Foundation
Several cases of anchored earth retention will be presented to highlight challenges of the unknown. These challenges include adjacent construction, bad ground, dewatering, and undercutting. Clients and owners are typically unaware of these challenges and of the associated delays and costs that can accrue getting to the bottom of the excavation.
3:50 pm - 4:20 pmInstrumentation of Anchored Earth Retention Projects
Boris Caro Vargas, SolData Northern America
The performance of anchored walls needs to be monitored precisely. This can be achieved in several ways including by monitoring the performance of anchors themselves (load, strain), or by monitoring the deflection/movements of the actual wall (AMTS, inclinometers). This presentation will mainly focus on the automatic monitoring systems currently used on several projects all over the world, will compare monitoring data with calculated values, and will show that instrumentation can be used to optimize project designs.
4:20 pm - 5:00 pmCase History: City Center – Washington, D.C.
Irvin J. Ragsdale P.E., Clark Foundations
City Center is a 10 acre mixed-use development located at the former site of the old DC convention center. The first phase of the project will deliver more than 185,000 sf of retail space, 458 rental apartments, 216 condominiums, 520,000 sf of office space, and 1,555 below grade parking spaces. For this 60 feet deep excavation, over 400 driven soldier beams and more than 700 drilled tiebacks were installed as more than 500,000 cy of soil was excavated.
5:00 pm - 5:30 pmPanel Discussion
5:30 pm - 6:45 pmWelcome Cocktail Reception
Sponsored by:
Brayman Construction Corporation & TEI Rock Drills                    

Wednesday, November 14, 2012
7:00 am - 8:00 amBreakfast
8:00 am - 8:15 amIntroduction and Welcome
Jonathan Bennett P.E., D.GE, Brayman Construction Corporation
8:15 am - 9:00 amKeynote: Micropiles, Where is the Industry Headed?
Allen Cadden P.E., D.GE, Schnabel Engineering, Inc.
The micropile industry continues its advancement based on project experience, research, and code development. This growth occurs locally and around the world. This presentation will review some recent evolutions in the industry and provide a brief recap of the new trends or interesting experiences reported at the International Workshop on Micropile in Milan, Italy that will have recently completed.
9:00 am - 10:00 amStructural and Geotechnical Design of Micropiles – Special Considerations and New Advancements
Terence Holman Ph.D., P.E., Geosyntec Consultants
This presentation focuses on special considerations related to the geo-structural design and performance of micropiles subjected to axial and lateral loading. Fundamental structural design of the micropile cross section, special characteristics of micropile materials, structure connections, and application of building codes will be discussed. Basic geotechnical design principles will be discussed and supplemented with real load transfer data obtained from instrumented micropile load tests.
10:00 am - 10:30 amNetworking Break in Exhibit Area
10:30 am - 11:20 amLRFD for Micropiles
Jonathan Bennett P.E., D.GE, Brayman Construction Corporation
Load and Resistance Factor Design (LRFD) is the predominant design method utilized today for reinforced concrete and structural steel, and is the primary focus of the relatively new AASHTO LRFD Bridge Design Specifications. Historically, micropile design has been performed mainly with Allowable Stress Design (ASD) methodologies, and most of the design manuals and specifications in existence prior to 2008 were based on ASD. In recent ADSC / DFI Micropile Seminars, there have been a number of questions regarding the proper use of LRFD for micropiles. This presentation will cover the fundamentals of LRFD as it applies to micropiles, and will provide a comparison with ASD methodology.
11:20 am - 12:00 pmMicropile Load Testing and Acceptance Criteria
Thomas Richards Jr., P.E., D.GE, Nicholson Construction Company
Load testing is an important part of almost every micropile project. Topics covered will include: typical procedures and equipment, new ASTM rules, strain gauges, acceptance criteria, and what is apparent elastic length?
12:00 pm - 1:00 pmLunch in Exhibit Area
1:00 pm - 1:40 pmDesign and Analysis of Micropiles for Lateral Loads
Carlos Englert, Schnabel Engineering
Micropiles must often be designed for lateral loading due to seismic loads, wind loading, or stabilization of existing slopes. This presentation will explain the procedure for analysis and design of micropiles for lateral loading. It will discuss practical procedures and important considerations and include several design examples.
1:40 pm - 2:30 pmSeismic Mitigation Applications
Morgan Eddy P.E., Steele Foundation
Micropiles can be used to minimize the harmful effects of earthquakes and strong ground shaking. This presentation illustrates how micropiles can be implemented to control seismic related damage, summarizes seismic design procedures, and touches on the recent August 23, 2011 Virginia EQ and implications of current building codes.
2:30 pm - 3:00 pmNetworking Break in Exhibit Area
3:00 pm - 3:30 pmCase History: Compton Creek Micropile Installation
Scott Dodds, Brayman Construction
Seven inch micropiles were installed to support a new bridge along Rt. 340 over Compton Creek in Rileyville, VA. During micropile installation and testing, extreme karstic conditions were encountered resulting in bond stress variations and installation difficulties. This presentation will discuss the design/site conditions encountered along with the efforts made to overcome these obstacles.
3:30 pm - 4:00 pmCase History: Instant Micropiles - Just Add Water
Michael J. Marasa P.E., BDM, Hayward Baker Inc.
Micropiles are frequently used in low headroom or lightly loaded conditions, and their use through rock fills or water-borne applications is often overlooked. These three short case studies illustrate the adaptive use of micropiles in applications deemed too difficult for other techniques used under a variety of unique loading conditions with the common denominator of shallow groundwater or open water.
4:00 pm - 4:30 pmMicropile Support of Three Undermined Buildings in Washington, D.C.
Fabian Lehmann Ph.D., P.E., Schnabel Foundation
In the early summer of 2008, construction began on a unique project close to the Capitol in Washington, DC. The project owner’s desire to increase its office space had to meet the strict requirements of the local regulations. Three buildings occupied the site, with two being designated as historic structures. By demolishing only non-historic buildings, one less floor level would have resulted, which was unacceptable to the owners. The solution was to preserve all three buildings, and excavate underneath them. The three buildings were supported with micropiles, allowing the below grade excavation and construction of a two level parking garage. To accomplish this task, in addition to a perimeter excavation support system, sixty micropiles and needle beams were installed in limited headroom and tight space conditions.
4:30 pm - 5:00 pmPanel Discussion

Presenter Bios
Daren J. Zywicki Ph.D., P.E.
GEI Consultants, Inc.
Dr. Zywicki is a Senior Project Manager and Geostructural Practice Leader with GEI Consultants, Inc. He has more than 14 years of experience in design and construction of geotechnical and structural projects, including earth retention systems, ground improvement and foundation systems. His expertise includes geotechnical site investigation, constitutive modeling, numerical modeling, measurement and sensor systems, geophysics and earthquake engineering. He received a BS from Northwestern University, and an MS and Ph.D. from the Georgia Institute of Technology, in Civil Engineering.
Jonathan Bennett P.E., D.GE
Brayman Construction Corporation
Mr. Bennett serves as Business Development Manager for Brayman Construction Corporation in Saxonburg, Pennsylvania. He has been involved in the design and management of specialty geotechnical construction projects since 1994 throughout the Mid Atlantic United States. He specializes in the design and analysis of ground anchors and anchored structures primarily focusing on tieback walls, soil nailing, micropiles, foundation underpinning and tiedowns for structural support. He received his BS and MS degrees in Civil Engineering from West Virginia Institute of Technology (1991 and 1996), with a specialization in Structures and Soil Mechanics, and has completed a Master of Engineering and Technology Management degree from George Washington University (2003). He is a registered Professional Engineer, an active member of ADSC, ASCE and DFI, and sits on a number of industry technical committees including the ADSC/DFI Micropile Committee (Co-Chairman), DFI Tiebacks and Soil Nailing Committee (Immediate Past Chairman), and the ASCE Geo-Institute Earth Retention Systems Committee.
Allen Cadden P.E., D.GE
Schnabel Engineering, Inc.
Mr. Cadden, has been with Schnabel Engineering for more than 25 years gaining experiences in every aspect of geotechnical design ranging from field services to project engineering, and management in a variety of projects across the United States and internationally. He is currently the Director of Strategic Development for Schnabel where he is responsible for implementation of the strategic direction of the firm, and provides supervision of firm wide business development, marketing services, and professional development and training. He has specialized experience in various applications of cement grouting technologies and in particular micropiles. His micropile experience began in the late 1990s when he was called on to develop repair methods for a heavy machine foundation and the significant expansion of a shopping mall in karstic geology. He joined the ranks of the International Society for Micropiles in 2001 and currently serves as its Chairman. He is a past member of the ADSC Board of Directors and currently serves as a Governor for the ASCE Geo-Institute.
Boris Caro Vargas
SolData Northern America
Mr. Vargas holds a Master’s Degree in Civil Engineering from the Ecole National des Ponts et Chaussees, France. He has over 10 years experience in underground foundations work and instrumentation. He participated in major monitoring programs and projects around the world, including the London Cross Rail, the Barcelona L-9 and the Seattle Alaskan Way Tunnel just to mention a few.
Scott Dodds
Brayman Construction
Scott Dodds is an Executive Vice President with Brayman Construction and is the General Manager of the company’s Foundation Division. Mr. Dodds has over 20 years of experience in the heavy civil and geotechnical construction industry with hands-on experience in estimating, design-build projects, construction operations, and project management. His technical expertise includes dam remediation, specialty foundations, and marine construction. Mr. Dodds has a Bachelor of Arts degree in Physics from Edinboro University of PA and also a Bachelor of Science degree in Civil Engineering from the University of Pittsburgh.
Morgan Eddy P.E.
Steele Foundation
Mr. Eddy is the Engineering Manager at Steele Foundation, a sheeting and shoring contractor in Washington, DC. He received his BS and MS degrees from Virginia Tech and is a licensed professional engineer in Virginia. His areas of interest include risk management, poor ground conditions, and east coast seismicity.
Carlos Englert
Schnabel Engineering
Mr. Englert has over 13 years of design and construction experience in geotechnical projects in the United States, and Venezuela. His consulting experience includes field investigation, laboratory testing, as well as analysis and design of geotechnical structures. Mr. Englert obtained his Civil Engineering Bachelor degree in 1998 at the Catholic University of Venezuela. After Graduation he worked for a Venezuelan Geotechnical Engineering Consultant firm before moving to the States to obtain a Master on Science at The Pennsylvania State University. After completion of his Master degree Mr. Englert worked with Schnabel Engineering from 2002 to 2006. From 2006 to 2009 Mr. Englert worked as Chief Engineer for Franki Pile Venezuela before joining Schnabel Engineering again. Mr. Englert is a specialist in design and field supervision of pressure-injected footings (Franki piles), drilled shafts, micropiles, shoring, slurry walls, ground improvement, stone columns, soil nails and tiebacks. His projects have included stability analysis and design of roadway embankments and rock slopes, earth retaining structures including multi-anchored systems and tied-back diaphragm walls, deep foundations for highway bridges, heavy industry plants, and high-rise construction, retrofitting and underpinning of existing structures. He is very active in professional societies; his participation in professional societies is highlighted by his role as Chairman of the Technical Committee for the 13th Pan-American Conference on Soil Mechanics and Geotechnical Engineering hosted by the Venezuelan Society of Geotechnical Engineers and under the auspice of ISSMGE.
Terence Holman Ph.D., P.E.
Geosyntec Consultants
Dr. Holman is a Senior Engineer in the Oak Brook office of Geosyntec Consultants with over 18 years of experience in geotechnical and geostructural engineering, design, construction, evaluation of technical risk for construction, and research/development. He holds B.S. and M.S. degrees in Civil Engineering from Drexel University in Philadelphia, PA and a Ph.D. in Civil Engineering (Geotechnics) from Northwestern University in Evanston, IL. At Geosyntec, he provides a leadership role in furthering the firm’s geotechnical and geostructural design practice and in developing a practice focused on providing construction engineering services to heavy civil and specialty contractors. He is a Member of ADSC-IAFD, AEG, ASCE, DFI, the Geo-Institute, and ISSMGE. He is the former Chair of the ASCE Metropolitan Section Geotechnical Group, current Chair of the DFI Tiebacks and Soil Nailing Committee, and a member of the joint DFI/ADSC Micropile Committee.
Robert Jakiel
Berkel & Company Contractors
Mr. Jakiel is currently a Foundation Manager for Berkel & Company Contractors and has over 30 years of experience in the specialty foundations industry including excavation support, micropiles and underpinning as well as experience in the areas of soil mixing and lightweight geotechnical backfills. He is a graduate of Pennsylvania State University (1981) with a BS in Civil/Structural Engineering.
Fabian Lehmann Ph.D., P.E.
Schnabel Foundation
Dr. Lehmann has over 10 years of experience in structural engineering and the design, construction and management of earth retention systems throughout the Mid-Atlantic Region. Mr. Lehmann received his MS at the University of Hannover, Germany and his Ph.D. at the Technical University of Berlin, Germany. Mr. Lehmann is a licensed P.E in VA, MD and DC since 2008.
Michael J. Marasa P.E., BDM
Hayward Baker Inc.
Mr. Marasa uses his 33 years of experience as a practicing geotechnical engineer to assist engineers and contractors with matching appropriate geotechnical construction techniques to specific site challenges. He frequently makes in-house presentations to engineering and construction firms to educate or update staffs on current ground improvement and foundation construction techniques including grouting, micropiles, earth retention, vibro techniques and many others. He has authored papers on ground improvement and has presented at numerous seminars and short courses. He graduated from the University of Louisville. He was Past-President of the ASCE Nashville Branch and Founder, Past Chairman of the ASCE TN Section Geotechnical Group. He is a member of ADSC, ASCE, ASDSO, Geo-Institute, ABC, US Society on Dams, HBI Vibro Committee and WTNSEA.
Rich Pratt P.E.
Schnabel Foundation
Mr. Pratt has over 12 years of experience in geotechnical and structural engineering, and is responsible for planning and overseeing the design, construction and construction management of temporary and permanent earth retention. His work experience includes cut-off walls, underpinning, bracket piles, internal bracing, soil nailing, micro piles and other specialty earth support and foundation systems. Mr. Pratt has worked at Schnabel for their Atlanta, Chicago and Houston offices and is currently the Area Manager for Maryland at their Mid-Atlantic Region. Mr. Pratt received his BS at the University of South Carolina; and is a licensed P.E in MD, VA and DC since 2007.
Irvin J. Ragsdale P.E.
Clark Foundations
Mr. Ragsdale has more than 32 years of experience in support of excavation systems and deep foundations. As Vice President for Clark Foundations, he is responsible for the management, design, and installation for below-grade construction projects throughout the Washington DC region. His work experience has involved both temporary and permanent earth retention using tiebacks and steel bracing, slurry walls, drilled caissons, driven piles, micropiles, and historic facade retention. He has a bachelor’s degree in civil engineering from Virginia Tech. He is a licensed Professional Engineer registered in Maryland, Virginia, and Washington, D.C. He is a member of ASCE and The Moles. He sits on the board of directors for the Pile Driving Contractors Association and the Mid-Atlantic Carpenters Training Center.
Thomas Richards Jr., P.E., D.GE
Nicholson Construction Company
Mr. Richards is Chief Engineer at Nicholson Construction Company. For over 20 years at Nicholson, he has dealt with technical aspects of a multitude of specialized geotechnical projects using micropiles, anchors, soil nails, diaphragm walls, and numerous grouting techniques. His responsibilities include design, quality control, research testing, and instrumentation. He is active in numerous committees of ADSC, ASCE, DFI, and Post Tensioning Institute (PTI), leading to frequent commenting on FHWA and other industry documents.
Fred Tarquinio P.E.
Nicholson Construction Company
Mr. Tarquinio is the Business Development Manager for Nicholson Construction’s Central Region, residing in Pittsburgh, Pennsylvania. He is responsible for leading the business development efforts for Nicholson’s bids. He has over 23 years of consulting, design and project management experience in the geotechnical construction field. He is a member ADSC, ASCE, DFI, and the International Society of Micropiles (ISM). Mr. Tarquinio has designed and managed several deep foundation and earth retention projects in the Eastern United States. He has a BS in Civil Engineering from the University of Pittsburgh and is a licensed professional engineer in Pennsylvania, Ohio, Maryland, Virginia, Florida, West Virginia and Washington, DC.
Dan Thome P.E.
Nicholson Construction Company
Dave Weatherby
Schnabel Foundation
Mr. Weatherby has worked for Schnabel for more than 40 years. He career has focused on the design and construction of earth retaining structures. Dave earned BSCE and MSCE degrees. He received a Distinguished Alumnus Award from the University of Illinois and the Geo-Institute’s Harry Schnabel Award for Career Excellence in Earth Retaining Structures.