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Title: Development of Guidelines for Rehabilitation of Existing Highway and Rail Transit Tunnels
Accession Number: 01730762
Record Type: Monograph
Abstract: The research for this project, along with common knowledge of older highway and rail transit tunnel deterioration, reveals that many tunnels throughout the U.S. require repair and rehabilitation for them to function as originally designed and constructed. The majority of the deterioration problems in the tunnel structural elements or in unlined rock tunnels is from groundwater within the soil/rock substrate around the tunnel seeping/flowing through cracks, joints, and segmental panels into the constructed tunnel. However, there are other factors besides leakage water that leads to deterioration within the tunnel. These include poor construction techniques employed during the original construction such as inadequate concrete vibration, poorly placed or poorly sealed waterproofing materials, inadequate provisions for temperature conditions at time of construction, inadequate curing of the concrete, etc. Other factors such as overspray from roadway vehicles and damaging exhaust fumes also contribute to degradation of the exposed tunnel liner structural elements. This report has identified several of the geologic and structural problems that typically occur and has presented numerous best practices used by tunnel owners worldwide to remedy the problems. The potential repair solutions have been briefly outlined and supplemented with photos and sketches (figures) for further clarification of the methods employed for the owner’s reference. Please note that the intent of this research project was to outline the best practices, not to provide specifications or detailed installation procedures for each of the suggested or employed repair methods.
Report/Paper Numbers: NCHRP 20-07, Task 276
Language: English
Corporate Authors: Gannett Fleming, Incorporated 207 Senate Avenue American Association of State Highway and Transportation Officials (AASHTO) 444 North Capitol Street, NW National Cooperative Highway Research Program Transportation Research Board Pagination: 64p
Publication Date: 2010-7
Media Type: Digital/other
Features: Appendices; Figures; Photos; References
TRT Terms: Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation; Railroads
Files: TRIS
Created Date: Feb 5 2020 1:59PM
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