Plastic Deformation Analysis of Coarse Granular Materials under Cycfic Moving Wheel Loads by Cumulative Damage Model

摘要

This paper presents a simple method to estimate the cyclic plastic deformation of ballasted track subjected to repeated train passages in terms of the strength and deformation characteristics of coarse granular materials. A new analytical procedure with linear elastic FE analysis considering the cumulative strain characteristics of poorly-graded crushed stone, that is ballast, which were derived from two types of multi-ring shear tests, namely a fixed-place loading test and a moving wheel loading test, was proposed. As the results, it was revealed that the newly proposed analytical procedure could roughly estimate the residual settlement of railroad ballast under cyclic moving wheel loads, by comparing test results of cyclic loading tests for small scale model of ballasted track with the results of FE analysis.