Part of the West Rosslyn Area Plan Study (WRAPS), a County-driven and community-involved redevelopment opportunity.
Geotechnical engineering, environmental consulting, and COT services for the 1,200,000-SF above grade complex with three high-rise towers containing upscale condominium and luxury apartment communities, and ground floor retail. The complex also includes four levels of below grade parking for approximately 1,050 cars.
Obstacles included adjacent parking garage w/ uncertain foundation conditions, adjacent below grade parking garage which could not receive additional lateral loading, existing fill and loose, wet soil conditions.
COT for this project fell under the stringent guidelines of Fairfax County’s Special Inspection Program.
GTA conducted a geotechnical study, caisson and retaining wall design, and COT services for the 158 SFH development. Evaluated site suitability for development and global stability analysis for several retaining walls and slopes up to 19’ high. Due to close vicinity of the property line to the retaining walls, it was determined that soil nail walls with Segmental block facing would be the best fit. Due to the height and complexity, one of the retaining walls was deemed Special Inspections by the County.
Designed abutments and wingwalls for a Geosynthetic Reinforced Soil – Integrated Bridge System (GRS-IBS) for the 120-LF bridge.
Bridge abutments were 30′ tall & able to be supported on shallow foundations despite low allowable soil pressure.
The GRS-IBS wall system eliminated the need for deep foundations or a multi-span bridge. This solution accelerated bridge construction and minimized earthwork, wetland impact, construction cost and life-cycle cost.