U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
This guide (FHWA-HRT-12-051) was issued to provide guidelines for construction of the geosynthetic reinforced soilintegrated bridge system (GRS-IBS). Refer to Geosynthetic Reinforced Soil Integrated Bridge System Interim Implementation Guide for GRS-IBS design and construction guidelines. This guide serves as the technical basis for agency-developed standard specifications. Local experience and practice shall be incorporated as applicable.
This report is the second in a two-part series to provide engineers with the necessary background knowledge of Geosynthetic Reinforced Soil (GRS) technology and its fundamental characteristics as an alternative to other construction methods. It supplements the interim implementation manual (FHWA-HRT-11-026), which outlines the design and construction of the GRS Integrated Bridge System (IBS). The research behind the proposed design method is presented along with case histories to show the performance of in-service GRS-IBS and GRS walls.
This manual outlines the state-of-the-art and recommended practice for designing and constructing Geosynthetic
Reinforced Soil (GRS) technology for the application of the Integrated Bridge System (IBS). The procedures
presented in this manual are based on 40 years of State and Federal research focused on GRS technology as
applied to abutments and walls.
This manual was developed to serve as the first in a two-part series aimed at providing engineers with the necessary background knowledge of GRS technology and its fundamental characteristics as an alternative to other construction methods. The manual presents step-by-step guidance on the design of GRS-IBS. Analytical and empirical design methodologies in both the Allowable Stress Design (ASD) and Load and Resistance Factor Design (LRFD) formats are provided. Material specifications for standard GRS-IBS are also provided. Detailed construction guidance is presented along with methods for the inspection, performance monitoring, maintenance, and repair of GRS-IBS. Quality assurance and quality control procedures are also covered in this manual.
The second part of this series (FHWA-HRT-11-027) is a synthesis report that covers the background of GRS-IBS and provides other supporting information to substantiate the design method.