TY - JOUR T1 - Numerical Modelling of Geotextile Reinforcement of Ballasted Railway under High Speed Train AU - Abebe, Melaku Sisay AU - Qiu, H. JO - Journal of Engineering and Applied Sciences VL - 11 IS - 3 SP - 311 EP - 321 PY - 2016 DA - 2001/08/19 SN - 1816-949x DO - jeasci.2016.311.321 UR - https://makhillpublications.co/view-article.php?doi=jeasci.2016.311.321 KW - Geotextile KW -reinforcement KW -subgrade KW -train load KW -dynamic impact AB - In recent years, it has become evident that high speed trains can cause severe track-settlement problems along certain sections of high speed train lines. The dynamic loading that occurs during the passage of high-speed trains leads to degradation of the ballast and underlying layers. We used LS-DYNA Software to analyze the impact of high-speed train load on a reinforced ballasted rail line, using non-reinforced ballasted rail line as a control. LS-DYNA is powerful finite element software that enables the modeling of parameters including static and dynamic load, traffic line, contacts, boundary conditions, materials and element types. The velocity of the train was defined as PRESCRIBED MOTION, the static load was defined as LONDE_NODE SET and the traffic line was defined as RAIL_TRACK and RAIL_TRAIN. The contacts between parts, segments and nodes of the high-speed ballasted rail track were ssdefined as CONTACT SINGLE SURFACE, CONTACT SURFACE_SURFACE and CONTACT FORCED TRANDUCER PENALTY, respectively. The result show that the deformation rate for reinforced ballasted rail track is 24% less than that for the non-reinforced ballasted track. Furthermore, the stress state of the reinforced ballasted track is <70% that for the non-reinforced ballasted track. Similarly, the strain state of the reinforced ballasted track containing geotextile between the sub-ballast and the subgrade is <76% that of the non-reinforced ballasted track. The results indicate that geotextile reinforcement can be used to strengthen weak, soft subgrade ballasted railway tracks. ER -