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Stress-dilatancy behaviour of remoulded Fujinomori clay

Szypcio Zenon, Dołżyk-Szypcio Katarzyna

Studia Geotechnica et Mechanica

2023

Vol. 45, nr s1

247--252

The effect of the degree of consolidation and the stress path on the behaviour of remoulded Fujinomori clay for drained triaxial compression and extension was analysed using the Frictional State Concept. It is shown that the stress–dilatancy behaviour can be approximated by a linear general dilatancy equation given by the critical frictional state angle and two soil parameters. The newly formulated dilatant failure state is represented on the stress ratio plastic dilatancy plane by points lying on the friction state line defined by the friction state angle and the Friction State Concept parameters α=0 and β=1. It has been shown that the stress ratio–plastic dilatancy relationship, which is very rarely used in the interpretation of test results, is important for a complete description of the behaviour of soils during shearing.

Stress-dilatancy for soils. Part III: Experimental validation for the biaxial condition

Szypcio Z.

Studia Geotechnica et Mechanica

2017

Vol. 39, nr 1

73--80

The validation of the general stress-dilatancy relationship is shown based on biaxial compression test data presented in the literature under drained and undrained conditions. Rowe’s and Bolton’s relationships can be treated as simplified forms of the general stress-dilatancy relationship. The stress ratio values are a function of not only the dilatancy but also the intermediate principal stress, the non-coaxiality angle defined by Gutierrez and Ishihara and the stress-strain path. For many granular soils, the critical frictional state angle of the shearing resistance Φ° = Φ’ϲϑ and parameters α and β are functions of the drainage condition, the stress level and the stress and strain paths.

Stress-dilatancy for soils. Part II: Experimental validation for triaxial tests

Szypcio Z.

Studia Geotechnica et Mechanica

2016

Vol. 38, nr 4

59--65

Different forms of the stress-dilatancy relations obtained based on the frictional theory for the triaxial condition are presented. The analysed test data show that the shear resistance of many soils is purely frictional. The angle Φ° represents the resistance of the soil as a combined effect of sliding and particle rolling on the macro-scale during shear at the critical frictional state. The stress-plastic dilatancy relations differ not only for triaxial compression and extension but also for drained and undrained conditions. The experiment investigated shows the correctness of the frictional state theory in the triaxial condition.