Effect of Some Con
"Effect of Some Construction Factors on Fabrics Used in Walls And Steep Sided Embankments
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ABSTACT
The concept of using geotextiles in walls and steep sided embankmentsconstruction is well accepted in the developed countries and practically today, the demand for them is ever increasing .In Egypt, of course, the utility of geotextiles is still very limited to this particular area of application.. This research aimed to produce nonwoven fabrics that can be used in walls and steep sided embankments . Two kinds of textiles materials were used ,polyester and polypropylene of denier 6 to produce fabrics of 350 ,600 and 850 g/m2 weights using three puncture depths 6,12 and 18 mm with two bonding techniques ,needle punching and Calendering . Some more results were reached concerns structures and materials .
Geotextiles in walls and steep sided embankments
Surface erosion due to rain and wind cause loss of huge amount of top soil walls , hill slopes , and embankment slopes . Besides this there was problems with short –term instability in the form of deepseated rotational slippage or transverse spreading of the embankment.
The main constituents of a reinforced soil wall and slopes are soil and reinforcement, as the name suggest. Since soil is weak in tension, the reinforcing elements are generally required to resist the tensile forces developed within the structure. As geotextiles are high tensile strength materials , therefore they are ideal materials to increase soil quality and thus to increase soil structural stability
The essence of construction is very simple , comprising the placing of selected fill incorporating horizontal layers of geotextile or geogrid reinforcement.(wrap – around method ) As one lift of fill is completed .
The experimental work
Nonwoven technique ,using cross-laid fiber orientation ,was used for producing all samples in the research .Two kinds of textile materials were used ,polyester and polypropylene of denier 6 and two kinds of bonding technique ,needle punching and calendaring .
Results and Discussion
Water permittivity and water permeability
It obvious from tables and figures that polyester fabrics had the highest rates of water permeability and permittivity compared to polypropylene fabrics .
that there is an inverse relationship between fabric weight and its water permeability and permittivity .
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From tables and figures, it can be seen that needle punched samples had the highest rates of water permeability and permittivity than calendared samples.
Tensile strength and elongation
From tables and figures that polyester samples have recorded the highest rates of tensile strength and the lowest rates of elongation, but the differences were insignificant .
Thickness
It can be seen from figures that polyester samples had a higher thickness than polypropylene samples . It is also obvious from tables and figures that there is a direct relationship between fabric thickness and its weight .
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