Triaxial tests are fundamental in geotechnical engineering to determine the shear strength parameters of soils under various drainage conditions. The three main types are Consolidated Drained (CD), Consolidated Undrained (CU), and Unconsolidated Undrained (UU). The key differences lie in how the soil sample is treated during the consolidation phase and the shearing phase, particularly regarding drainage and pore water pressure. #civilengineering #geotechnicalengineering #engineering