The Effects of Reduction of Mud Pumping by the Use of Geotextile in Soft Roadbed

초록

In this study, the filed test with several types of geotsynthetics was conducted to prove economical and efficient mean to prevent the problem of mud-pumping and excessive settlement. Field test section is located at Chungbuk line in Korea which is from Mock-haeng to Dong-ryang. Based on the preliminary investigation, there was often occurred the severe mud pumping and currently 1,700 mud pumping spots observed. The field test section was selected among the severe mud pumping occurred points, which is included curved section with a radius of 500m. The field test site was divided into 5 sub-sections one is the reference section and other is geotextile treated section. In the four sub-sections, different types of geosynthetics were installed. Total length of the test site was 200m and individual length of each section was 40 m. In this paper present the stiffness and physical properties of roadbed soils in field test section and effectiveness of geotextile installation between ballast and soft roadbed. The mud-pumping phenomena, settlement of elastic or plastic sleeper, wheel-loads, lateral force, and earth pressures were analyzed.