Abstract
The paper presents results of testing the peak and residual shear strength of soils of flysch origin, taken from the areas of shallow landslides situated in Beskid Maly and Beskid Niski regions of southern Poland. The tests were carried out in a standard direct shear apparatus with the box dimensions 120 × 120 × 97 mm, its intermediate frames forming a shearing zone 10 mm high. It was stated that for calculating the stability of landslide slopes, it seems to be the safest to take the residual strength parameters determined at the maximum moisture content of the soil subjected to shearing in the range of relative deformations of a sample in the order of 10%. The obtained residual values of the angle of internal friction of the test soils significantly depend on the values of the liquid limits and plasticity index, i. e., with increasing these parameters, the values of the angle of internal friction decrease. However, the nonzero residual values of cohesion, obtained from tests, should be omitted in stability calculations. Keywords: shallow landslides, peak and residual shear strength, Carpathian flysch
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