Shear Strength Properties of Coarse-Grained Soils Determined Using Large-Size Direct Shear Test

Abstract The paper deals with an analysis of the shear strength behaviour coarse-grained materials using large-sized direct apparatus. curve compacted material allows for determining three typical strengths, i.e. a maximum density sample tested (shear at point A), peak P), and critical achieved large horizontal movement C). Professional laboratories usually apply two different methods. first method considers A second C. aim article is not to critically evaluate both methods, but analyze results tests gravels. series showed that these stresses may differ from each other in some cases, especially poorly graded materials. In case sandy soil, C equal. However, gravel, greater than A. greatest difference between strengths was measured medium ratio increases increasing grain size tested. as well parameters gravels better represented by multi-linear or nonlinear failure line.