A Characteristic of Deformation and Strength of Domestic Sands by Triaxial Compression Tests

This study conducted experiment for understanding engineering characteristics of domestic sands by examining standard sand and sand from Yokji Island and Nakdong River in terms of confining pressure, K0, over consolidation and relative density factors through triaxial compression test.The test showed that deviator stress by strain positively changed as confining pressure and relative density grow while K0 and over consolidation factors do not directly correlated with it.Angle of internal friction decreases as confining pressure increases which strengthens contact force between particles, and declines as relative density drops, whereas K0 and over consolidation factors hardly affect the results.When it comes to volumetric strain, volume expansion decreases as confining pressure increase due to crushability and rearrangement of particles while K0 and over consolidation shows same movement unconditionally, and relative density appears compressed as it grows at the beginning however it expands as axial strain increases.Modulus of elasticity (Esec) by strain has tendency into convergence resulting in initial secant modulus of elasticity (Eini) > secant modulus of elasticity(Esec) > tangent modulus of elasticity (Etan).On the other hand, it grows as confining pressure and relative density increase while indicating similar modulus of elasticity (Esec) regarding on K0 and over consolidation.Slope of critical line (M) tended to decrease as confining pressure increases, follow same line according to K0, confining pressure and relative density, and increase as relative density grows.