UCS test usage Full-automatic strain controlled triaxial test apparatus

    The triaxial tests are performed to determine the stress-strain relation of a soil specimen subjected to different strain levels and drainage conditions.

    Investigation of stress-strain relationships in soil is usually carried out with triaxial tests where undisturbed, remoulded or compacted specimens are subjected to different stress level sand drainage conditions to simulate as closely as possible the different situations that can occur in the subsoil on site and the possible effects of construction, excavations, embankments, landslides, etc.

Types of triaxial test: test descriptions

Total stress - Unconsolidated Undrained (UU) test

    With this method the shear strength is measured in terms of total stress. The soil specimen is not allowed to consolidate and maintains its original structure and water content, so that its compressive strength depends only on the level of geostatic stress in the field.

    Tests are often carried out on three specimens from the same sample, each subjected to a different confining pressure. Provided that the soil is fully saturated, the shear strength will be the same for each test and is known as "undrained shear strength".

Effective stress - Consolidated Undrained (CU) test

    With this test method the shear strength is measured in terms of effective stress. The specimen is saturated and allowed to consolidate (i.e. to change its structure and water content) at the required confining pressure. At the end of consolidation, the specimen is subjected to a controlled application of load, during which no drainage is allowed and pore pressure is measured. The effective stresses are calculated as the difference between the total stress and the pore pressure.

    Since the shear strength is affected by the effective stresses, by testing a set of three specimens at different confining pressures, it is possible to define the failure envelope according to Coulomb's model and define the parameters c' and φ'.

Effective stress- Consolidated Drained (CD) test

    This test method is the same as the CU test except that the failure stage is carried out very slowly to prevent any change in the pore pressure inside the specimen, which is allowed to drain. Calculation of the total and effective stresses and failure envelope are also the same as for the CU.

UCS test usage Full-automatic strain controlled triaxial test apparatus

Model TSZ-1, TSZ-1A, TSZ-2, TSZ-6

Sample dimension: TSZ-1,TSZ-1A: dia.39.1×80 mm,
                                     TSZ-2: dia.39.1×80 mm, dia.61.8×125 mm
                                     TSZ-6:  dia.39.1×80 mm, dia. 61.8×125 mm, dia.101×200 mm
Shearing rate: 0.0001-2.4mm/min.
                          0.0001-4.8mm/min
Confining pressure: 0-2Mpa
Back pressure: 0-2Mpa,
                            TSZ-1A without back pressure
Hole pressure: 0-2.0Mpa
Volume change Graduation:TSZ-1, TSZ1A, TSZ-2: 0-50ml
                                                   TSZ-6: 0-100ml
Axial displacement: 0-30mm
Axial load: TSZ-1, TSZ-1A: 0-10KN
                    TSZ-2: 0-30KN, TSZ-6: 0-60KN

 UCS test usage Full-automatic strain controlled triaxial test apparatus

 Packing: export standard wooden case

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