A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Resilient Modulus Backcalculation Techniques for Track
The layer moduli of track substructure components are important factors in the evaluation of track condition and estimation of maintenance costs. Layer moduli can be estimated from in-situ tests such as the cone penetration test (CPT); however, for layers of open graded aggregate, such as railway ballast with large individual particles, the results of the CPT are significantly influenced by individual particles and may not reflect the behavior of the mass. A method of evaluating layer properties using downhole measurement of layer deformation is presented in this paper. Tests were conducted on track using downhole measurements of layer deformation under both quasi-static test loads and passing traffic. The applied loads were measured by instrumenting the track superstructure. The top of rail load and substructure deformation data were used with a geotechnical model of track to backcalculate the moduli of individual layers. The process is similar to the procedure for processing data from the falling weight deflectometer; however, data from actual traffic can be evaluated. The results are compared to the CPT results from the same site and also to expected results for similar materials.
Resilient Modulus Backcalculation Techniques for Track
The layer moduli of track substructure components are important factors in the evaluation of track condition and estimation of maintenance costs. Layer moduli can be estimated from in-situ tests such as the cone penetration test (CPT); however, for layers of open graded aggregate, such as railway ballast with large individual particles, the results of the CPT are significantly influenced by individual particles and may not reflect the behavior of the mass. A method of evaluating layer properties using downhole measurement of layer deformation is presented in this paper. Tests were conducted on track using downhole measurements of layer deformation under both quasi-static test loads and passing traffic. The applied loads were measured by instrumenting the track superstructure. The top of rail load and substructure deformation data were used with a geotechnical model of track to backcalculate the moduli of individual layers. The process is similar to the procedure for processing data from the falling weight deflectometer; however, data from actual traffic can be evaluated. The results are compared to the CPT results from the same site and also to expected results for similar materials.
Resilient Modulus Backcalculation Techniques for Track
Sussmann, Theodore R. (author) / Selig, Ernest T. (author)
Specialty Conference on Performance Confirmation of Constructed Geotechnical Facilities ; 2000 ; Amherst, Massachusetts, United States
2000-04-03
Conference paper
Electronic Resource
English
Resilient Modulus Backcalculation Techniques for Track
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