As we can see from the Tab. 3, differences between maximal values of shear stress obtained with and without
taking into account continual change in the shear area are not negligible. The difference is larger for higher normal
stress and has reached e. g. value up to 58 kPa (21.4%).
Values of shear strength parameters of soil obtained without and with continual change in the shear area can be
seen in the Tab. 4 and soil improvement by various amounts of fibres can be seen in the Tab. 5.