Initial Compression Characteristics of railway embankment after opening to traffic

초록

One of the primary functions of the subgrade in a railway track is to distribute and sustain the stress transferred from upper structures. To ensure that the subgrade performs this task adequately, compaction quality of subgrade must be validated. And also, the fill materials consisting of subgrade must satisfy the specifications. In general, specifications for the subgrade materials are similar from country to country, but especially specifications for the fines contents (soil particle size less than 75 micro-meter) differ. In Korea, fines content is limited to maximum 25% and in Japan it is limited to maximum 15% for the concrete track. The reasons for the difference of fines content are considered as difference of soils from country and strictness of specifications. There are lots of cases that soils nearby construction site cannot be used because the soils do not satisfy the specification for fines content in its country though the soils can be used in an another country. For the reasonable and economical design, however, the specifications for the fines content are needed to research. In this study, cyclic loading tests for 4 types of soils with different fines contents were performed to identify the compression characteristics according to variation of fines contests