چكيده لاتين :
In this paper shear behavior of two calcareous sands having different physical properties are
investigated using drained and undrained triaxial tests. The investigated sands are obtainedfrom two different
zones located in Persian Gulf, Kish Island and Tonbak region. Analysis based on energy aspects show that
friction angle in these soils, having crushable particles. is formed of three components: substantial internal
friction angle, dilation and particle breakage angle. Dilation component is available in the two investigated
sand. Particle breakage component is a Junction oj grains hardness, structure and geometry shape. Particles
breakage decreases the volume of sample during drained tests and creates positive pore water pressure during
undrained tests. Two investigated sands show different amount ofdilution and particle breakage under similar
conditions. Simultaneous dilation and particles crushing and different amount ofthem result in different shear
behavior of the two studied sands. Energy aspects are used to determine the effect ojparticle crushing on the
shear strength. There is a suitable compatibility between relative breakage of grains and consumed energy
ratio for particle breakage.
