Study on Strength Behaviour of Soil Using Geotextile
Abstract
Geosynthetics have become well established construction materials for geotechnical and environmental application in most parts of the world. Because they constitute manufactured materials, new products and applications are developed on a routine basis to provide solution to routine and critical problems alike. This paper focuses on recent advances on geosynthetics products such as geotextiles, applications and design methodologies for reinforced soil and environmental protection works. Geotextiles have been successfully used for reinforcement of soils to improve the bearing capacity. Laboratory California bearing ratio (CBR) tests were performed to investigate the load-penetration behavior of reinforced granular soils with geotextile. Samples of granular soil with different grading are selected and tested without reinforcement. Then by placing geotextile at certain depth within sample height in one and two layers, the effects of the number of geotextile on the increase in bearing capacity of reinforced granular soils and grading on performance of geotextile is discussed. The result of these tests shows that, bearing ratio of reinforced granular soils with geotextile increases. And also done the direct shear test for determine the consolidated-drained shear strength of a sandy to silty soil.
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Introduction
The uses of geotextile in many engineering applications have become more apparent and have proven to be an effective means of soil improvement. In early applications in roads and airfield construction, emphasis was laid on the separation function of the geotextile. Resl and Werner (1986) carried out the laboratory tests under an axisymmetric loading condition using nonwoven, needle-punched geotextiles. The results showed that the geotextile layer placed between subbase and subgrade can significantly increase the bearing capacity of soft sub grades. Raw materials such as polyester. Polyvinyl alcohol, polypropylene, aramide, polyethylene and polyamide are processed on our modern, efficient production line
Geosynthetics is applicable in various purpose of constructions such as reinforced retaining walls, coastal protection, river training, highways , airports, urban roads, ground improvements etc.. In this study, the CBR test carried out on nonwoven needle-punched geotextile combines with the granular soils with different grading, the geotextile reinforcement placed between three different subgrade layers and the comparison between bearing capacity of soil with and without geotextile reinforcement under axisymmetric loading condition was investigated.
Conclusion
In this study it is evident that geotextile soil techniques enchances the strength properties of the well designed earthern structures. This is being proved in this study conducting tests in poor soil.For flexible pavement the stregt of the soil can be improve by means of reinforcement geotextile this has being proved by the CBR test conducted in this study. The shear strength property of the soil strength increases for the soil reinforced with geotextile compared with respect to un reinforced. Finally we conclude that the using of geotextile strength properties of all black cotton soil and other poor soil can be increased to many field. So we can use geotextile inn various earthhernn structures in various applications.