Stafford County, VA
GTA performed field exploration, laboratory tests, slope stability and retaining wall analysis, and prepared the geotechnical report for approximately 1-mile of new 4-lane divided highway, including a stream crossing with a single-span bridge. The Mine Road Bridge is a 120-foot-long prestressed AASHTO bulb-tee multi-girder bridge supported on Geosynthetic Reinforced Soil – Integrated Bridge System (GRS-IBS). GTA was responsible for the design of the wingwalls and abutments. Application of the GRS-IBS, a Federal Highway Administration (FHWA) Every Day Initiative, was the innovative solution that allowed for the construction of 30-foot-tall abutments despite the low allowable soil bearing pressure. The GRS-IBS wall system eliminated the need for costly deep foundations or a multi-span bridge. The GRS-IBS solution accelerated bridge construction and minimized earthwork, wetland impact, construction cost and life-cycle cost. The bridge is located in the Embrey Mill Community in the Rock Hill District of Stafford County and received an award for its innovative and effective design using Geosynthetic Reinforced Soil – Integrated Bridge System. The design won the 2017 Virginia Transportation Construction Alliance (VCTA) Transportation Engineering Award presented by Virginia Department of Transportation (VDOT).