DFI S3 2020 | Virtual Conference Schedule* | Wednesday, August 5 All presentations are in Eastern Standard Time (EST) 11:00 a.m. - 11:05 a.m. 11:05 a.m.- 11:30 a.m. Conference Introduction Roberto Lopez, P.E. Malcolm Drilling Co. Inc. | Program Chair Incorporating Deep Foundations in Limit-Equilibrium Slope Stability Analyses: Revisiting Fundamentals and Seismic Applications Ben Turner, Ph.D., P.E. Dan Brown and Associates, PC Deep foundations are commonly used to prevent or stabilize existing landslides, deriving resistance to slope movement through embedment in bearing material below the slide plane. A variety of design methods are used in practice to incorporate piles into limit-equilibrium method slope stability analysis, some of which fail to adequately capture the pile resistance mechanism or correctly identify the critical pile failure mode, leading to false interpretation of factors of safety. Of particular concern is the common practice of assigning the shear strength of the pile material, e.g., the shear strength of concrete or steel multiplied by the cross sectional area of the pile, as a resisting force in slope stability analyses. Without performing separate laterally-loaded pile analyses, this approach fails to identify whether shear failure is in fact the controlling pile mechanism; more often than not, analyses show that the pile would actually fail in flexure prior to shear. As a result, the shear strength approach may drastically overestimate the pile contribution to stability, inflating the calculated factor of safety. 11:30 a.m.- 12:30 p.m. Software Discussion The following providers will analyze the problem using a variety of methods, present the solutions, and engage the audience in a detailed Q&A session: n Itasca Consulting Group, Inc. n GREGORY GEOTECHNICAL n Rocscience, Inc. n Bentley/Soilvision/Plaxis 12:30 p.m.-12:45 p.m. 12:45 p.m.- 2:00 p.m. Break Continuation of Software Discussion with Question and Answer Session Panelists: Varun Varun, Ph.D. Itasca Consulting Group, Inc. Garry Gregory, Ph.D., P.E., D.GE GREGORY GEOTECHNICAL & OSU Jeff Lam, M.Eng., P.Eng. Rocscience, Inc. Augusto Lucarelli, P.E. Itasca Consulting Group, Inc. *Subject to Change Murray Fredlund, Ph.D., P.Eng SoilVision Systems Ltd. Sina Javankhoshdel, Ph.D., P.Eng. Rocscience, Inc.
