Without the use of geosynthetics, nowadays we currently no longer find examples of the construction with supporting structures, bridge pillars or dams. Geosynthetics are synthetic materials used to improve the constructions stability. Together with the soil, they form so called reinforced soil. The purpose of such construction is to increase the stability of the soil and extend the life expectancy of the construction. Geosynthetics are materials with high tensile strength, which take over the tensile forces in case of deformations and are mechanically resistant to external influences. We know several implementations of geosynthetics used in layer separation, filtering, leaking, anti-erosional protection and reinforcement. In the case of the use of reinforcement, the function is similar to that of installing a fixture into the concrete, which is strengthening. When geosynthetic is embedded in the soil, the friction between the materials creates tension, which is transferred from the soil to the reinforcement. In the case of the construction of the embankments, geogrids are used for reinforcement, as these in the soil act like tensile bonds. Geogrids must be flexible for sprouting soil grains and at the same time having sufficient tensile strength and expansion to keep it toned and take on tensile loads. Geosynthetics occur in the form of geotextiles, geocomposites, geocombs, geomembranes, etc. One of the main problems that arises in the use of geosynthetics is sustainability. The basic purpose of sustainability is to determine the time during which the geosynthetic will retain its primary characteristics and perform its functions. As an addition to the strength of the soil, the role of geosynthetics is to increase the stability coefficient of the embankment in which they are embedded. The stability coefficients for the given slope are calculated using computer tools such as Slide and MacStars. They are used to assess the global stability or collapse potential of circular and non-curricular slides by considering the Mohr-Coulomb failure criterion. The main purpose was to compare the stability coefficients of both programs used and analyse their deviation and determine the functionality of the programs. The compared results showed that there are deviations in all the compared models, with the largest differences occurring when using the Janbu's corrected method.
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