A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Geotechnical Considerations for Tunnels under Highways and Other Features
Utility owners and design engineers working on new pipeline installations do not always realize the challenges that their project may encounter when trenchless construction of shorter tunnel crossings is required until late in the design process. While larger diameter and longer tunnel projects are typically recognized for their significance, relatively short tunnel crossings under railroads, highways, canals, and other features can be overlooked on a primarily open cut pipeline project. However, the geotechnical challenges associated with shorter tunnel crossings can be as complex as those experienced on large tunnel projects and can be exacerbated by limited subsurface investigation and design input. This paper discusses design considerations for a variety of geotechnical risks that can be present on tunnel crossing projects, including shallow cover, obstructions, mixed face conditions, and contamination. Guidelines for performing geotechnical investigations to reduce these risks are also provided. A case study is presented which highlights how several geotechnical challenges (obstructions and contamination) were addressed during project design and construction.
Geotechnical Considerations for Tunnels under Highways and Other Features
Utility owners and design engineers working on new pipeline installations do not always realize the challenges that their project may encounter when trenchless construction of shorter tunnel crossings is required until late in the design process. While larger diameter and longer tunnel projects are typically recognized for their significance, relatively short tunnel crossings under railroads, highways, canals, and other features can be overlooked on a primarily open cut pipeline project. However, the geotechnical challenges associated with shorter tunnel crossings can be as complex as those experienced on large tunnel projects and can be exacerbated by limited subsurface investigation and design input. This paper discusses design considerations for a variety of geotechnical risks that can be present on tunnel crossing projects, including shallow cover, obstructions, mixed face conditions, and contamination. Guidelines for performing geotechnical investigations to reduce these risks are also provided. A case study is presented which highlights how several geotechnical challenges (obstructions and contamination) were addressed during project design and construction.
Geotechnical Considerations for Tunnels under Highways and Other Features
Fischer, Gregory R. (author)
Rocky Mountain Geo-Conference 2021 ; 2021 ; Westminster, Colorado
2021-04-14
Conference paper
Electronic Resource
English
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