Itis a methodof thedetermination of shear strength ofkinds ofsoils.Usuallywith3-4 cylindrical specimens,under different ambient pressure (i.e., a small primary stress sigma 3),axial pressureis inflicted respectively.Shear strength parameters are obtainedaccording toMohr coulomb theory.
It is theDetermination of totalshear strength parametersand effectiveshear strengthofFine grained soil and sand soil.according to the different drainage conditions,it can be divided into(UU)(CUorUU,CD)
NoConsolidated undrained(UU) test is drainageisnot allowedintest in in the processof inflictingsurrounding pressure and enhance pressure until the destruction.It is suitablefor determination of fine particle soil and sand soil
1.Consolidated undrained(UU) testmakesampledrainageandconsolidation underambient pressure. under theundrainedcondition,Increase the axial force until destruction.It is suitable forshear strengthofClay soil and pressure coefficientofsand soil and pore.
2.consolidated drained triaxial test CD Testmakesampledrainageandconsolidationunderambient pressure.Increase the axial force until destructionunder the condition of allowingsample drainage.It is suitable forshear strengthofClay soil
(A sample multilevel confining pressure and axial pressure to shear, it is suitable forthree axis undisturbed soil, disturbed soil and irregular fracture crack soilthat can notobtainmultiple specimen)
3.Pore water pressure dissipation coefficient,Dissipation percentage and pore pressure coefficientis produced byaxial compressive forceunder the condition ofambient pressureandK0.(Saturation Undisturbed clay soilis greater than the85%,moisture contentis greater thanThe optimum moisture content of the compaction clay soil).
