Abstract:
ABSTRACT
Prepared for DFI SuperPile24: Piling Design and Construction Conference, June 12-14, 2024
Investigation, Design, and Construction of Rock-Socketed Drilled Shafts
by
Monica Cortez P.E.
California Department of Transportation
50 Higuera St, San Luis Obispo, CA 93401
(213) 604-3492
monica_cortez@dot.ca.gov
The topic of this presentation is the investigation, design, and construction of rock-socketed drilled shafts for Toro and Old Creek Bridges on Highway 1 in San Luis Obispo County, California. Both bridge projects will be presented with discussion of site characterization, foundation design procedures, construction challenges and solutions, and lessons learned at each project site. In-depth topics will include:
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- Site investigation techniques to characterize the subsurface materials including drilling and sampling methods and instrumentation
- Design and construction of temporary work platforms and sheet pile walls for water management
- Construction access, time constraints and coordination with local communities, difficult drilling conditions including fractured rock, caving, ocean influence, groundwater, hard rock, and field adjustments required for constructability purposes
- Geotechnical and structural design of Old Creek Bridge on a 60-degree skew
- Use of shaft inspection devices to quantitatively assess the debris thickness at the bottom of an excavation
- Gamma-gamma density logging results, anomalies encountered, and mitigation efforts
- Anticipated and unanticipated challenges to construction and solutions developed through owner/contractor partnering to overcome them