FAILURE CRITERIA AND LATERAL STRESSES IN TRACK FOUNDATIONS

摘要: In conventional track systems the ties are supported by an unbound ballast layer underlain subballast or subgrade, both. Analytical models used to estimate stresses and deflections of these multilayer predict that lower portions will develop significant incremental tensile stresses. Their magnitude is such that, when combined with normally expected geostatic stresses, failure predicted. Some analytical have incorporated criteria for as a means limiting permissible values. A discussion approaches presented along implications predicted would permanent deformation prediction methodologies. An alternative method based on residual lateral in presented. description given laboratory box testing device measure Experimental results shown indicate relatively large due repeated applications loading, can ballast. The effects combining initial continuum finite element discussed. Particular attention deformation.