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Sewage pipelines are one of important infra-structures. The main reasons of sewage pipelint failure are improper backfill materials and compaction controls in field. Especially, it is very diffficult to compact the lower part of circula pipelines. In order to overcome these problems, the prefabricated light-weight plastic foundation was developed. Couple of load-dispacement tests were carried out to get the characteristic of failure. From the limited laboratoty loading tests, the use of prefabricated light-weight plastic foundation is an alternative to solve the difficulty of backfill materials and compaction control. Key Words : Sewage pipeline, Backfill materials, Compaction, Prefabricated light-weight plastic foundation      2011  . * Corresponding Author : Kwan-Ho LeeTel: +82-10-9932-4798 email: kholee@kongju.ac.kr 12 02 07  12 03 15  12 06 07 1.            ,  ,                 .   `    ,              ․    .                       . ,     ,    ,  ,           [1,2]. 1      .        38%,      30%,  12%,      10%,  10% .  ,      70%          .  2      .

Laboratory Loading Test of Light-Weight Prefabricated Plastic Foundation for Sewage Pipe Line