Estudo da influência da duração do carregamento em projetos de aterros sobre solos moles destinados à construção de vias sujeitas ao tráfego de veículos especiais ultra-pesados

Abstract

This dissertation presents a study of the influence of loading duration on undrained resistance of soft clay in order to improve design methodology of embankments on such type of soil for construction of roads subject to traffic of special vehicles, which tend to be more and more necessary to meet the sources and destinations of special transport of large ultra-heavy over size equipment for industrial assemblies. An literature search including the main aspects of the embankment project on soft soils, techniques of obtaining and the influence of loading duration on the undrained resistance of the soft soil. It is also presented a case study of the E-694 section of Via UHOS, where it was found a layer of soft soil with about 16 m thickness and was verified the influence of loading duration on undrained soil resistance, since that section, in the original geometry, supported special traffic of 30 kPa load equivalent and, subsequently, presented evidence of rupture in the day following the execution of pavement designed with 40 cm thickness, that represents a distributed load of about only 8 kPa. The case study included the interpretation of geotechnical investigation carried out, which consisted of standard penetration tests, piezocone test and vane test, as well as analysis of stability of landfill. Based on the results of the literature search conducted and case study it was possible to present a perspective of a new design methodology of embankments on soft soils that will be subject to special high loads of short duration, which makes it an improvement over current practice, which considers such loads as permanent.