Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Soils reinforced with discrete synthethic fibers
This paper discusses the technique of using discrete and randomly dispersed polypropylene fibres as reinforcement in granular soils. Two lengths of discrete fibres were tested in conjunction with four soils ranging from a uniform silica sand to a fine silt. Specimens of natural and reinforced soil were investigated in static triaxial compression. A constitutive model was employed to verify the experimental results. The addition of discrete and randomly dispersed polypropylene fibres to four granular soils increased shear strength considerably. This increase is more pronounced in fine silts than in medium or uniform sands and was in direct relation to fibre content. The shear strength of composites can conveniently be expressed by a linear relationship over a range of confining pressures varying from 100 to 700 kPa. The angle of shearing resistance remained unchanged from the natural soil regardless of fibre content. The vertical strains necessary to achieve the increase in shear strength were large and would generally not acceptable in field applications. Doubling the fibre length from 63 mm to 126 mm had no observable effect on the shear strength or the compressibility of the composite for the fibre contents investigated. An increase in fibre content resulted in a decrease of secant modulus. The secant modulus of the various composites is, therefore, not a function of the confining pressure only but also of fibre content. The strength increase due to fibre addition can be estimated by the Gray-Ohashi model provided the physical properties of the soil and reinforcing elements are known. In the case of randomly dispersed fibres, fibre density and the angle of fibre orientation had to be determined or assumed for each soil and fibre content. Therefore, the model can be used to estimate the expected strength increase for similar soils with polypropylene fibre concentrations equal to those used in this study.
Soils reinforced with discrete synthethic fibers
This paper discusses the technique of using discrete and randomly dispersed polypropylene fibres as reinforcement in granular soils. Two lengths of discrete fibres were tested in conjunction with four soils ranging from a uniform silica sand to a fine silt. Specimens of natural and reinforced soil were investigated in static triaxial compression. A constitutive model was employed to verify the experimental results. The addition of discrete and randomly dispersed polypropylene fibres to four granular soils increased shear strength considerably. This increase is more pronounced in fine silts than in medium or uniform sands and was in direct relation to fibre content. The shear strength of composites can conveniently be expressed by a linear relationship over a range of confining pressures varying from 100 to 700 kPa. The angle of shearing resistance remained unchanged from the natural soil regardless of fibre content. The vertical strains necessary to achieve the increase in shear strength were large and would generally not acceptable in field applications. Doubling the fibre length from 63 mm to 126 mm had no observable effect on the shear strength or the compressibility of the composite for the fibre contents investigated. An increase in fibre content resulted in a decrease of secant modulus. The secant modulus of the various composites is, therefore, not a function of the confining pressure only but also of fibre content. The strength increase due to fibre addition can be estimated by the Gray-Ohashi model provided the physical properties of the soil and reinforcing elements are known. In the case of randomly dispersed fibres, fibre density and the angle of fibre orientation had to be determined or assumed for each soil and fibre content. Therefore, the model can be used to estimate the expected strength increase for similar soils with polypropylene fibre concentrations equal to those used in this study.
Soils reinforced with discrete synthethic fibers
Verstärkung von Böden mit diskreten synthetischen Fasern
Bauer, G. (Autor:in) / Oancea, A. (Autor:in)
1999
11 Seiten, 7 Bilder, 4 Tabellen, 9 Quellen
Aufsatz (Konferenz)
Englisch
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