Drilled shaft foundations in soils and rocks are often a technically sound and cost-effective choice where a deep foundation solution is appropriate based on site conditions, applied loads, project schedule, and performance requirements. When soils are of relatively poor quality and the structure loads are relatively large the shafts are often drilled through the poor soils into underlying rock mass if present. These shafts could be founded or seated on top of the rock mass, or they could be drilled into the rock mass to form a rock socket. There are a number of different methods to design shafts in soils and rocks. The thrust of the discussions in this workshop is to establish a good understanding of the geotechnical design procedures for drilled shafts in soils and rocks. Construction techniques can have a significant effect on mobilized axial and lateral resistances and therefore brief information on effect of construction on drilled shafts will also be included. The workshop will be indexed to the latest (2020) version of the Bridge Design Specifications (BDS) based on the  Load and Resistance Factor Design (LRFD) platform of the American Association of State Highway and Transportation Officials which is a key component of Federal Highway Administration (FHWA) guidelines for drilled shafts. Information from AASHTO’s latest (2020) Guide Specification for Service life design will also be presented.

Using a collaborative and interactive learning approach, this virtual workshop will help you understand the geotechnical design procedures for drilled shafts in soils and rocks using the concepts of LRFD. The workshop will help you assimilate crucial considerations for design of drilled shafts in soils and rocks through active participation by frequent interactions throughout the workshop and real-time expert feedback. The interactions will facilitate a better understanding of the nuances of the various geotechnical design procedures which would help you avoid costly design errors in real-world projects. In between the two live sessions, attendees will independently work on an application (e.g., exercises) and/or a reflection (e.g., reading) assignment.

DAY 1

• Introductions
• General terminology for design of drilled shafts
• Failure modes and limit states
• Resistance and resistance factors
• Evaluation of geotechnical axial resistance using chart approach
• Concepts for evaluating lateral response
• Extreme events
• Design aspects for drilled shafts in ephemeral waterways
• Typical structural details
• Brief introduction to construction techniques for shafts in soils
• Review of Day 1
• Interactive Question and Answer (Q&A) session
• Assignment of homework
• Adjourn

DAY 2

• Roadmap for Day 2
• Review of homework assignments and recap of Day 1
• Introduction and definition of variables for rock sockets
• Definition of rock and site characterization
• Axial resistance in rocks
• Lateral resistance in rocks
• Brief introduction to construction techniques for rock sockets
• Material Deterioration: AASHTO Guide Specification Provisions
• Closure and references
• Review of Day 2 and full workshop
• Interactive Question and Answer (Q&A) session
• Adjourn