CHARACTERISTICS OF BEHAVIOR OF SOFT ROADBED THROUGH LONG-TERM INSTRUMENTATION-FLELD TEST

초록

In this study, Several types of geotextile was used on the selected track-bed. The use of geotextile prove a economical and efficient mean to prevent the problem of mud-pumping and settlement. Field testing sections from Mock-haeng to Dong-ryang in the Jeolla lines in Korea were selected to investigate in current condition the of track and roadbed. And three places were chosen among 1,700 spots where mud-pumping was often observed and maintenance was required. At the curved section with a radius of 500m between Mock-haeng and Dong-ryang. This testing site was divided into 5 sections. In the four sections, different types of geotextiles were installed. Fifth are remained with. Total length of the test site was 200m and individual length of each secton was 40 m. In order to understand the condition and the strength of prepared roadbed, the stiffness and physical properties of roadbed soils were evaluated and analyzed. Also, after the installation, the mud-pumping, settlement of elastic or plastic sleeper, failure of track, wheel-loads, lateral force, and earth pressures were investigated."