PN-88/B-04481 DOWNLOAD

P [kN] is the horizontal shear force and a [m] is the specimen size. The fibres had length 70 mm and white colour. Laboratory methods of determination of soil shear strength by box shear apparatus in Slovak language. Maximal values of shear stress without taking into account continual change in the shear area case a. High values of negative cohesion Publishing house UNM, Praha, It is shown that in this case, the optimal amount of fibres is 1. pn-88/b-04481

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pn-88/b-04481

Shear strength tests total stress. As we can see from the Tab.

pn-88/b-04481

Differences between maximal values of shear stress obtained from case ; a and b. The STN does not mention on shear area changes during the shear. 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. So the PN [3] takes into account continual change in the shear area but prescribes to carry out at least 5 particular tests 5 values of the normal stress.

There are also many methods to improve soils, including using natural and synthetic fibres.

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We do not recommend taking into account continual change in the shear area when evaluating direct shear tests if only 3 particular tests had been carried pn-88/b-04418.

Geotechnical investigation and testing. On pn-88/b-044481 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. Values of shear strength parameters of soil obtained without and with continual change in the shear area and their differences.

Their differences can be seen in the Tab. Building soils - Laboratory tests in Polish language. Soil improvement by various amounts of fibres. From the reason that it is proposed linear relationship between normal and shear stress, increase in values of angle of internal friction cause decrease in values of cohesion see 2 last columns in the Tab. In geotechnical practice, there are many cases when it is necessary to improve soils. Publishing house UNM, Praha, Maximal values of shear stress taking into account continual change in the shear area case b.

P [kN] is the horizontal shear force; a [m] is the specimen size and r [m] is shear displacement.

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Abstract The paper deals with soil improvement using polyester fibres of length 70mm mixed in soil SC as random reinforcement in amount of 0. The fibres had length 70 mm and white colour. Normal stress kPa Maximal values of shear stress for specimens with various amounts of fibres kPa. It will be shown that for tested soil, optimal amount of fibres is 1. Concerning direct shear tests, there are many documents dealing with them, e.

Pn-88/b-04481

Maximal values of shear stress without taking into account continual change in the shear area case a. Calculation of maximum shear stress had been carried out pn--88/b-04481 two cases see also [3]: Specimens size was 0.

In this paper we will introduce results of direct shear tests, carried out on soil specimens with polyester fibres. Calculation of maximum shear stress had been carried out for two cases see also [3]:.

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Soil improvement by various amounts of fibres Increase of shear strength parameters by various amounts of fibres. 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. User agreement Privacy policy. They concluded that the increase in strength and stiffness was reported to be a function of: Increase of fibres amount to 1.

Voltr, Laboratory tests of soils improved by synthetics fibers. CrossMark Available online at www.

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