APLICAÇÃO DE GEOSSINTÉTICOS COMO PROPOSTA DE SOLUÇÃO NA ESTABILIZAÇÃO DE TALUDE EM JOÃO PESSOA/PB

Abstract

With the incidence of buildings located in risk areas in unstable slopes, there is an aggravation of the possibility of landslides due to some anthropic actions that potentiate these mass movements. There are several types of mass movement, however most of these disasters happen due to the incidence of agents outside the soil massif, such as rainwater, building overloads, among others. In order to provide the stabilization of the slopes, in order to increase the safety of the population of a given locality, there are several containment systems that employ different materials and thus involve different costs. One of the solutions that can be used in slope containment is the application of geosynthetics, which is an industrially produced polymeric material with the function of improving or replacing conventional materials, due to its great applicability in the face of different demands. The containment alternative using geosynthetics is understood as reinforced soil, as it is inserted into the soil providing increase in the tensile strength of the massif, and this system is very attractive due to its easy installation, low cost, fast execution, among others. Thus, the present work proposes the execution of a geogrid reinforced soil containment for the slope of BR 230 - Km 19 in the city of João Pessoa, in which over the years there have been several landslides, especially in times of heavy rainfall. in order to provide slope stability as well as surface erosion control. For this purpose, the predimensioning of the containment was performed considering the analysis of internal and external stability, proving the increase of resistance evaluated by the Safety Factor using GeoSlope software. Having the basic dimensioning of the solution, it was prepared its preliminary budget, in order to obtain parameters of execution feasibility when compared with the costs of containment alternatives, previously studied for the same location. The solutions previously proposed by Almeida (2016) were thrown in curtain and stapled soil, which had their budgets updated to the present day through readjustment indices formulated by DNIT, since some items that make up the original budget no longer exist in unit price consultation platforms. Thus, it was possible to make the comparative analysis between the cost of execution of each work, having concluded that the value of the solution in reinforced soil is lower than the stapled soil, besides, these two alternatives are much lower than the cost of the tossed curtain solution