Building soils - Laboratory tests in Polish language. From all mentioned documents, only PN prescribes to take into account continual change in the shear area. P [kN] is the horizontal shear force and a [m] is the specimen size. Calculation of maximum shear stress had been carried out for two cases see also [3]: Because there are various kinds of soils to be improved and we can use various kinds of fibres with different properties, it is always necessary to carry out the tests to find improvement rate. They concluded that the increase in strength and stiffness was reported to be a function of: The authors also state that strength and stiffness of the composite soil is improved by fibre reinforcement. 
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P [kN] is the horizontal shear force; a [m] is the specimen size and r [m] is shear displacement. Laboratory methods of determination of soil shear strength by box np-88/b-04481 apparatus in Slovak language.
Improvement of soil was measured by direct shear tests, using shear box of size 0. Calculation of maximum shear stress had been carried out for two cases see also [3]: Specimens without polyester fibres and with polyester fibres in amount of 0. As we can see from the Tab.
Soil improvement by various amounts of fibres Increase of shear strength parameters by various amounts of fibres. Concerning direct shear tests, there are many documents dealing with them, e. Geotechnical investigation and testing.
The ASTM states that factors which incorporate assumptions regarding the actual specimen surface area over which the shear and normal forces are measured can be applied to the calculated values of shear or normal stress, or both. Diploma thesis in Czech language Normal stress kPa Maximal values of shear stress for specimens with various amounts of fibres kPa. In this paper we will introduce results of direct shear tests, carried out on soil specimens with polyester fibres.
We can expect that result shear stresses calculated by reduced shear area will be higher, making higher values of shear strength parameters.
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British Standard Methods of test for Soils for civil engineering purposes. The difference is larger for higher normal stress and has reached e. The differences in values of shear strength pn-88b-04481 obtained with and without taking into account continual change in the shear area are relatively high up to Published by Elsevier Ltd. The values of shear strength parameter in parentheses see also negative values of cohesion in the Tab.
The maximal values of shear stress obtained from direct shear tests for above mentioned case a and case b can be seen in the Tab. Specimens size was 0.
Maximal values of shear stress without taking into account continual change in the shear area case a. The fibres had length 70 mm and white colour. CrossMark Available online at www.
Laboratory methods for direct shear tests. International organization for standardization. Shear strength tests total stress. They concluded that the increase in strength and stiffness was reported to be a function of: Values of shear strength parameters of soil obtained without and with continual change in the shear area can be seen in the Tab. Laboratory testing of soil.
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Differences between maximal values of shear stress obtained from case ; a and b. Pn-88b/-04481 fibres; Soil improvement; Random reinforcement; Direct shear test; Angle of internal friction; Cohesion.
Pn-8/b-04481 the basis of predictive models presented in the paper, they state that it is clear that the strength of fibre reinforced soil increases with increase in aspect ratio, fibre content, fibre modulus and soil fibre surface friction.
P [kN] is the horizontal shear force and a [m] is the specimen size. Soil improvement by various amounts of fibres.
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