Braced excavation design, using:
- Soil nails & Tiebacks
- Steel sheet pile and soldier pile
- Sinking caissons
- Internal bracing
MSE Wall design using:
- Welded Wire Walls
- Modular Block Wall Systems
- Stess Wall
- Generic Systems
- Any Proprietary System (generally external sizing)
Concrete (PreCast "T", Stess Wall) & CIP retaining walls
Micropiles for
- Underpinning
- Ground reinforcement
- Seismic upgrades
- Building foundations
Deep foundations with micro-piles of drilled piers
- Composite pier or micro-pile/soil foundations
Small earth dams and embankments
- Dam safety studies
- Marina design
Cofferdams
Soil improvement design
Slope stabilization design
Forensic analyses and evaluation of failures
Geotechnical instrumentation and monitoring
Geotechnical engineering services
USBR Olmsted Flowline Replacement Project (2001-2003).
To remove and replace a 78-inch pipe in use as an aqueduct it was necessary to make vertical cuts through a talus slopes (1H:1.1V) with design heights up to 28 feet. GDS deisgned a vertical cut, using hollow micro-piles bars drilled vertically to grout the loose rock. Soil nails were then drilled in as the excavation proceeded.
Note the massive 1' to 3' diameter columns of grout formed by the vertical micro-piles. Hollow-bars were deliberately chosen to create these large grout masses, which was much less expensive than a drilled pier or pile face. Crews were so comfortable with this, they neglected to shotcrete for several feet of cut.
