In all stability problems such as the bearing strength of the foundations, the stability of the slopes, the calculation of the lateral soil pressures on the re- taining walls, it is necessary to compare the forces that cause the collapse along a possible collapse sur- face. Then, the forces that resist collapse should be calculated in order to evaluate a safety number against collapse. Ring shear tests should be utilizedin order to get the shear strength parameters at high deformation levels for the cohesive soils that are a part of big slippy surfaces. In this study, 27 ring shear tests were performed on three different samples that have face slope stability problems in Turkey. The samples were subjected to different loading rates and the peak and residual strength parameters of the soils were obtained. The results were evaluated in change of the internal friction angles with the variation of the plasticity, fines content and the loading rates. Some relationships with high R2s between the pa- rameters and the friction angle were observed from the test results.
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