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Stress-dilatancy relationship for railway balast

Dołżyk-Szypcio K.

Studia Geotechnica et Mechanica

2018

Vol. 40, nr 2

79--85

Knowledge of the mechanical behaviour of ballast is very important for designing a railway track, especially for high-speed lines. The monotonic drained triaxial tests of scaled and fouled ballast presented in literature were analysed using the Frictional State Theory. The stress-plastic dilatancy relationship shows that four characteristic stages of shearing may be specified. The influence of stress level and water content may be quantified by the use of the Frictional State Theory.

Stress-dilatancy for crushed latite basalt

Dołżyk-Szypcio K.

Studia Geotechnica et Mechanica

2018

Vol. 40, nr 1

6--10

In this article, the stress-dilatancy relationship for crushed latite basalt is analysed by using Frictional State Theory. The relationship is bilinear, and the parameters α and β determine these two straight lines. At the initial stage of shearing, the mean normal stress increment mainly influences breakage, but at the advanced stage, it is shear deformation that influences breakage. At the advanced stage of shearing, the parameter αpt represents energy consumption because of breakage and βpt mainly represents changes in volume caused by breakage during shear. It is also shown that breakage effect is significant at small stress levels and the η-Dp plane is important to fully understand the stress-strain behaviour of crushed latite basalt in triaxial compression tests.

Stress-dilatancy for soils. Part IV: Experimental validation for simple shear conditions

Szypcio Z.

Studia Geotechnica et Mechanica

2017

Vol. 39, nr 1

81--88

This paper validates the frictional state theory using published experimental data from simple, direct and ring shear tests. Simple shear is treated as a special case of plane strain conditions. In order to define complete stress and strain, additional assumptions are made: in the direct shear and ring shear tests, simple shear is assumed to occur in the shear band. For Φ° = Φ’ϲϑ = Φ’r, the stress-dilatancy relationship obtained from the frictional state theory is similar to the relationships proposed by Taylor and Bolton. Further experiments, especially those that use a hollow cylindrical shear apparatus, are necessary to fully validate the frictional state theory in simple shear conditions.

Stress-dilatancy for soils. Part I: The frictional state theory

Szypcio Z.

Studia Geotechnica et Mechanica

2016

Vol. 38, nr 4

51--57

An unconventional subdivision of volumetric strains, the newly formulated frictional and critical frictional states and some of energetic and stress condition assumptions result in new stress-plastic dilatancy relationships. These new stress-plastic dilatancy relationships are functions of the deformation mode and drainage conditions. The critical frictional state presented in this paper is a special case of the classical critical state.