A Recap of DFI Summer Seminars DFI ended the summer with a variety of technical seminars. We thank the seminar speakers, underwriters, cooperating organizations and exhibitors for their support to make these events possible. We also extend a special thank you to the committee members and chairs who assisted by developing the technical programs and moderating the sessions. S3: Slopes, Slides and Stabilization Seminar Following the success of the 2014 Landslide and Tieback Seminar in Pittsburgh, Pa., the Landslides and Slope Stabilization Committee collaborated with the Tiebacks and Soil Nailing Committee to present an expanded seminar on landslides, excavation support and slope stabilization in Denver, Colo., August 1-3. Fifteen exhibitors displayed cutting-edge services and products for earth stabilization and retention to over 110 attendees. The seminar featured keynote lectures on design and construction of elements used to stabilize slopes as well as critical design issues and differences between owner and contractor designs. Twenty-two other presentations highlighted specific case histories on landslide projects. Colorado State Department of Transportation which led to a lively dis- cussion of the capabilities of each. A special Women in Deep Foundations (WiDF) Committee lecture and re- ception featured Professor Shideh Dashti, and her presentation “Seismic Per- formance of Structures on Liquefied Ground and the Effectiveness of Mitigation Strategies.” The event was hosted by HDR at its Denver office. Helical Piles and Tiebacks Seminar The Use of Helical Piles and Tiebacks in Seismic & Lateral Load Conditions Seminar was held August 10-12 in Ontario, Calif., with 85 attendees, 12 speakers and 13 exhibitors. A committee meeting and reception on August 10 was followed by presentations on the proper design, application and installation of helical piles and tiebacks in seismic and lateral load conditions. Kwabena Ofori-Awuah, P.E., chair of the Seismic & Lateral Loads Committee, opened the event with an overview of the design for seismic and lateral load conditions, and Dimitrios Konstantakos followed with a presentation on helical pile response under lateral loading. Professor Soil Mixing and Micropiles Seminar Chris Ramsey led the S3 software discussion DFI’s Soil Mixing Committee and ADSC-DFI Joint Micropile Committee, supported by ISM (International Society for Micropiles), collaborated with GI-ASCE East Central Florida Chapter to host the Soil Mixing and Micropiles: States of Practice for Design, Construction and Quality Assurance Seminar on September 7-9 in Orlando, Fla. The seminar had 112 attendees and 11 exhibitors. The e v ent Professor Amy Cerato presented the results of helical pile testing featured expert speakers who covered the evo- lution of the deep mixing industry and an advanced Micropile 201 de s i gn sho r t course. Presen- tations by spe- cialists from all sectors of the Speakers at S3 representatives discussed the management and mitigation of geohazards while other presentations covered the design and use of secant walls for excavation support. The seminar ended with a summary of software analysis options including Oasys, Snail, Snap2 and two Rocscience programs, Amy Cerato, P.E., delivered the keynote presentation, “All Shook Up! Preliminary Results of Seismic Tests on Single and Group Helical Piles in Sand.” The seminar concluded with a helical pile installation demonstration at the JRW Foundation Systems facility. geotechnical engineering and construction industry highlighted practical aspects of design and construction, innovative case histories, and quality control and assurance methods. Professor George Filz of Virginia Tech delivered a keynote lecture on the stiffness and strength characterization of soil-cement produced by the deep-mixing method and an integrated design approach for support of embankments, floodwalls and other facilities using deep-mixed elements. He highlighted the impact of strength variability and the need to consider different potential failure modes, citing several case histories. Leaders in the micropile industry presented detailed geotechnical and structural design procedures and quality practices for slope stabilization, settlement control, lateral loading, hollow bar techniques and corrosion protection. Attendees spent quality time networking during the event, particularly at the well-attended reception the first evening. DEEP FOUNDATIONS • NOV/DEC 2016 • 35
