Welcome to VirgooL.netمقاله ، پاورپوینت ، پایان نامه ---- ویرگــ ، ــول عمرانموضوع مقاله : پایان نامه انگلیسی رفتار روسازی های انعطاف پذیر مسلح شده (ABSTRACT)The purpose of a geotextile separator beneath a granular base, or subbase in a flexiblepavement system is to prevent the road aggregate and the underlying subgrade from intermixing.It has been hypothesized that in the absence of a geotextile, intermixing between base courseaggregate and soft subgrade occurs. Nine heavily instrumented flexible pavement test sectionswere built in Bedford County Virginia to investigate the benefits of geosynthetic stabilization inflexible pavements. Three groups of different base course thicknesses (100, 150 and 200mm) testsections were constructed with either geotextile or geogrid stabilization or no stabilization.Woven geotextile was used in sections 2, 5 and 8. Geogrids were used in sections 3, 6 and 9, andsections 1, 4 and 7 were controls.Six Falling weight deflectometer (FWD) tests were performed on all the nine sections over 30months. The nine sections were subjected to at least 5 load drops with wide loading range eachtime. The measured deflections were analyzed using the MODULUS back-calculation program todetermine layer moduli. The measured deflections were used together with elastic, viscoelasticand the MODULUS program to determine the extent of intermixing at base-subgrade interface.The study concluded that a transition layer would develop when a separator is absent, especiallyin the weak sections (designed to fail in three years). Other measurements such as in-situ stresses,rut depth, and subsurface profiling (using ground penetrating radar) support the conclusion of thedevelopment of a transition layer.