12-Triaxial-Test

12-Triaxial-Test - 1 1 3 3 ed-Undrained Tr iaxial...

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Unformatted text preview: 1 1 3 3 ed-Undrained Tr iaxial Compression Test on Cohesive Soils ined) Plat eau due to consolidatino Florida International University Department of Civil and Environmental Engineering CEG 4011 L Geotechnical Engineering I Laboratory Dr. Luis A. Prieto-Portar PhD, PE, SE. Lab Report #12 The Triaxial-Test Undrained (ASTM D-3080) Performed on July 2010 Team Members: Member Attendance Writing Assignment Completed Summary A. INTRODUCTION This notice deals with Undrainest triaxial test (U) also called an Unconsolidated-Undrained test (UU). Its a common method to measure the mechanical properties of many deformable solids, especially soil , sand , clay , and other granular materials or powders . A solid is defined as a material that can support shear stress without moving. However, every solid has an upper limit to how much shear stress it can support. The triaxial tester is designed to measure that limit. The stress on the platens is increased until the material in the cylinder fails and forms sliding regions within itself, known as shear bands . A motion where a material is deformed under shear stress is known as shearing. The geometry of the shearing in a triaxial tester typically causes the sample to become shorter while bulging out along the sides. The stress on the platen is then reduced and the water pressure pushes the sides back in, causing the sample to grow taller again. This cycle is usually repeated several times while collecting stress and strain data about the sample. From the triaxial test data, it is possible to extract fundamental material parameters about the sample, including its angle of shearing resistance, apparent cohesion, and dilatancy angle. These parameters are then used in computer models to predict how the material will behave in a larger-scale engineering application. An example would be to predict the stability of the soil on a slope, whether the slope will collapse or whether the soil will support the shear stresses of the slope and remain in place. Triaxial tests are used along with other tests to make such engineering predictions The principle behind a triaxial test is that the stress applied in the vertical direction (along the axis of the cylinder) can be different than the stress applied in the horizontal directions (along the sides of the cylinder). This produces a non-hydrostatic stress state, which contains shear stress....
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12-Triaxial-Test - 1 1 3 3 ed-Undrained Tr iaxial...

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