## Abstract

A database with about 60 undrained monotonic and cyclic triaxial tests on kaolin is presented. In the monotonic tests, the influences of consolidation pressure, overconsolidation ratio, displacement rate and sample cutting direction have been studied. In the cyclic tests, the stress amplitude, the initial stress ratio and the control (stress vs. strain cycles) have been additionally varied. Isotropic consolidation leads to a failure due to large strain amplitudes with eight-shaped effective stress paths in the final phase of the cyclic tests, while a failure due to an excessive accumulation of axial strain and lens-shaped effective stress paths was observed in the case of anisotropic consolidation with \(q^{\text{ ampl }}< |q^{\text{ av }}|\). The rate of pore pressure accumulation grew with increasing amplitude and void ratio (i.e. decreasing consolidation pressure and overconsolidation ratio). The “cyclic flow rule” well known for sand has been confirmed also for kaolin: With increasing value of the average stress ratio \(|\eta ^{\text{ av }}| = |q^{\text{ av }}|/p^{\text{ av }}, \) the accumulation of deviatoric strain becomes predominant over the accumulation of pore water pressure. The tests on the samples cut out either horizontally or vertically revealed a significant effect of anisotropy. In the cyclic tests, the two kinds of samples exhibited an opposite inclination of the effective stress path. Furthermore, the horizontal samples showed a higher stiffness and could sustain a much larger number of cycles to failure. All data of the present study are available from the homepage of the first author. They may serve for the examination, calibration or improvement in constitutive models dedicated to cohesive soils under cyclic loading, or for the development of new models.

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## Acknowledgements

This research was funded by German Research Council (DFG) in the framework of the project “Behaviour of cohesive soils under high-cyclic loading: Experimental studies and constitutive description” (WI 3180/2-1). The financial support by DFG is gratefully acknowledged herewith. The tests have been performed by the technicians H. Borowski and F. Schwab in the IBF soil mechanics laboratory.

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## Appendix: Generalized flow rule considering anisotropy

### Appendix: Generalized flow rule considering anisotropy

The equations for the generalized flow rule applied in Sect. 4.4 are briefly outlined in the following. The generalized flow rule has been proposed in [129] as a component of the high-cycle accumulation (HCA) model of Niemunis et al. [87]. It allows for considering anisotropy. The equations do not distinguish between an inherent and an induced anisotropy. A second-order anisotropy tensor

is introduced with \({\varvec{\sigma }}\) being a stress for which the flow rule is assumed purely volumetric, \(\mathbf{m}(\mathbf{a})\,=\,\vec{\mathbf{1}}\). The deviatoric part of \({\varvec{\sigma }}\) is denoted as \({\varvec{\sigma }}^*\). The isotropic flow rule can be recovered by setting \(\mathbf{a}= {\mathbf{0}}\). For the critical state, the flow rule is purely deviatoric. For an intermediate stress \({\varvec{\sigma }}, \) an interpolation is used. Given \(\mathbf{a}\), the stress \({\varvec{\sigma }}\) is projected radially onto the deviatoric plane expressed by \(p = 1\). Next, the projected stress \({\varvec{\sigma }}/p\) is decomposed as follows (Fig. 30a):

The conjugated stress \(\mathbf{t}\) is found from

It should lie on the critical surface at \(p = 1\) (Fig. 30b). For that purpose, the scalar multiplier \(\lambda \) must be determined from the condition that the conjugated stress \(\mathbf{t}\) satisfies

with \(Y_c\) calculated from:

Therein \(\varphi _{cc}\) is a material constant being similar (but not necessarily identical) to the critical friction angle \(\varphi _c\) derived from monotonic shear tests. Having found \(\lambda \) the generalized flow rule is calculated from

wherein *n* is an interpolation parameter (another material constant). Linear interpolation is obtained with \(n=1\).

As an example, the flow rule \(\mathbf{m}\) for the axisymmetric stress state in a triaxial test with the diagonal components

and for a transversal isotropy

is derived. The parameter *a* and the stress ratio \(\eta _{\text{ iso }}\) for which the accumulation is purely volumetric are interrelated via

Furthermore,

holds. From two solutions of Eq. (7)

the positive one is chosen as \(\lambda \). Finally, the strain rate ratio \(\omega = \dot{\varepsilon }_v^{\text{ acc }}/\dot{\varepsilon }_q^{\text{ acc }}\) shown in Fig. 19 is calculated from

for triaxial compression or extension, respectively.

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Wichtmann, T., Triantafyllidis, T. Monotonic and cyclic tests on kaolin: a database for the development, calibration and verification of constitutive models for cohesive soils with focus to cyclic loading.
*Acta Geotech.* **13, **1103–1128 (2018). https://doi.org/10.1007/s11440-017-0588-3

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### Keywords

- Cyclic loading
- Database
- kaolin
- Monotonic loading
- Triaxial tests
- Undrained conditions