It is a method of the determination of shear strength of kinds of soils.Usually with 3-4 cylindrical specimens,under different ambient pressure (i.e., a small primary stress sigma 3), axial pressure is inflicted respectively. Shear strength parameters are obtained according to Mohr coulomb theory.
It is the Determination of totalshear strength parametersand effectiveshear strength of Fine grained soil and sand soil.according to the different drainage conditions,it can be divided into(UU)(CU or UU,CD)
No Consolidated undrained(UU) test is drainage is not allowed in test in in the process of inflicting surrounding pressure and enhance pressure until the destruction. It is suitable for determination of fine particle soil and sand soil
1.Consolidated undrained(UU) test make sampledrainage and consolidation under ambient pressure. under theundrainedcondition, Increase the axial force until destruction. It is suitable forshear strength of Clay soil and pressure coefficient of sand soil and pore.
2.consolidated drained triaxial test CD Testmake sampledrainage and consolidation under ambient pressure. Increase the axial force until destruction under the condition of allowing sample drainage. It is suitable forshear strength of Clay soil
(A sample multilevel confining pressure and axial pressure to shear, it is suitable for three axis undisturbed soil, disturbed soil and irregular fracture crack soil that can not obtainmultiple specimen)
3.Pore water pressure dissipation coefficient, Dissipation percentage and pore pressure coefficient is produced by axial compressive force under the condition of ambient pressure and K0.( Saturation Undisturbed clay soilis greater than the85%,moisture contentis greater than The optimum moisture content of the compaction clay soil).
