Experimental Study On Durability Of Railway Geosynthetics

In recent years,more and more geosynthetics have been used in Railway Engineering.The paper summarizes the application types of geosynthetics in Railway engineering,and selects several kinds of commonly used geosynthetic materials for the study of endurance test.we summarized some aging rules through a large number of test data It has practical guiding significance for geosynthetic material's long-term application in railway engineering.In this paper,the long-term creep tests at different temperature and different strain ratios were carried out for the HDPE one-way stretch plastic geogrid;one-way geogrid.The results show that the temperature and load level are sensitive indicators of the creep of Geogrid,and the long-term creep strength reduced factor at different temperatures and different design years was obtained.The experimental study on the thermal oxidative aging of geofabric shows that the basic properties of the material do not change before and after the thermal aging,but the fracture strength of the material decreases.When the geotextile is processed by acupuncture,the ultimate tensile strength of dacron nonwoven geotextile is much smaller than that of polypropylene fabric nonwoven geotextile.The thickness of the material has great influence on the thermal oxidation resistance of the tunnel waterproof board.The results show that the spray has little effect on the anti-oxidation of the geogrid,In the practical engineering application,we can ignore the influence of rain on the aging of the geogrid.Under the same experimental conditions,the anti-oxidation property of the polypropylene filament needle punched geotextile is better than that of the polyester filament needle punched Geotextile.The experimental study on the chemical resistance of geosynthetics showed that the weight of the samples changed little while the strength of the geotextile decreased greatly;The higher the temperature,the lower the strength of Geotextile in alkaline solution.