Fig. 7From: Numerical investigation of soil plugging effect inside sleeve of cast-in-place piles driven by vibratory hammers in claysPrincipal stress isosurfaces of the bottom of the soil plug and corresponding legend. a Principal stress isosurfaces of the bottom of the soil plug at penetration depth of 0.5 m. b Principal stress isosurfaces of the bottom of the soil plug at penetration depth of 3 m. c Principal stress isosurfaces of the bottom of the soil plug at penetration depth of 6 mBack to article page