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# Tri axial test

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TRI-AXIAL TEST

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### Tri axial test

1. 1. Tri-axial test
2. 2. content no title page 1 objective 3 2 theory 4-6 3 Equipment 7 4 Procedure 8-9 -PREPARERATION OF SAMPLE 5 Data and analysis 10-13 6 discussion 14 7 conclusion 15 8 reference 16
3. 3. Objective: Student should be able to Measure the shear strength parameters using the tri-axial test.
4. 4. Theory When conducting site investigations for buildings, in most circumstances short term stability will be the most critical. Therefore this document will deal only with the determination of total shear strength parameters of cohesive soils using, Unconsolidated Undrained Tests. There may be instances where effective shear strength parameters are required, and they would require other forms of tests such as Consolidated Undrained or Drained. Determination of those parameters will be dealt with in the proposed Sri Lankan standard on laboratory testing of soils. Specimens used for the test are of cylindrical shape and should be undisturbed. Specimen is subjected to a confining fluid pressure in a tri-axial chamber and axial load (deviator load) is applied in a strain controlled or stress controlled manner. In all stages of the test untrained conditions are maintained without allowing for any pore water pressure dissipation. Method does not generally measure pore water pressures and parameters determined are therefore in terms of total stresses.
5. 5. Determine the applied failure load Pa,f for each specimen tested. The applied failure load is defined as the maximum applied load during the test. Calculate the applied failure stress σa,f :