Avaliação do comportamento mecânico de solo arenoso reforçado com microgrelha

Abstract

A matter of incredible relevance for geotechnical engineering is the research for economic solutions in order to improve the strength and compressibility characteristics of soils. Among the techniques used for this purpose there is the use of geosynthetics as reinforcement material, which are industrialized materials that when mixed with soils have the ability to withstand tensile stresses. Currently, more and more geosynthetic materials are being developed to perform different functions in replacement of soils. As a illustration, this category includes microgrids that may be used, among some functions, for instance, as an element for separating and reinforcing the soil. However, many of the properties of microgrids and their interaction with the soil are still poorly understood, that implies it is necessary further research about the subject. This research aims to evaluate the mechanical behavior of sandy soils reinforced with microgrids, through the analysis of stress-strain curves and the resistance parameters obtained for the reinforced soil. For the evaluation of the mechanical behavior of the reinforced soil, triaxial tests of the densified and drained type (CD) were used varying the amount of microgrid layers inserted in the soil using a small scale. Furthermore, for comparison of results, triaxial tests were carried out in sandy soil reinforced with non-woven geotextile with 200 g/m² and 300 g/m² of grammage. Overall, increased deflection stress and axial deformation at rupture, the results showed that the insertion of the microgrid in the soil resulted in improvements in the parameters of soil resistance (cohesion and effective friction angle), being higher for specimens reinforced with three layers of microgrids. In conclusion, the results indicated that the soil reinforced with microrids presented higher strength parameters than the soil reinforced with geotextiles.