BOR Boysen Dam Crane
Overview
Foundation Design for Critical Equipment
Advanced Geotechnical Solutions (AGS) was contracted to provide subsurface exploration and geotechnical engineering for a new service crane foundation at Boysen Dam. The crane was expected to carry low to moderate loads, requiring a stable and carefully engineered foundation system.
AGS performed field exploration and lab testing, ultimately recommending:
- Shallow spread footings with an allowable bearing pressure of up to 3,000 psf
- Guidance on fill material, compaction standards, site drainage, and the use of sulfate-resistant concrete
Key Challenges
- Highly variable subsurface conditions, including:
- Gravelly sands with cobbles and boulders
- Dense, weathered granite
- Potential for settlement-sensitive equipment performance
- Difficult excavation in areas with large boulders or shallow rock
Solutions
To address these conditions, AGS:
- Conducted targeted test borings and lab analysis to determine bearing capacity
- Confirmed feasibility of shallow foundations by limiting bearing pressures
- Provided adaptive construction guidance for excavation in hard or obstructed zones
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