Application
For determining the shear strength parameters of saturated soils from triaxial compression shear tests conducted under consolidated undrained conditions with measurements of pore water pressures.
The Triaxial Test System provides triaxial compression tests on cylindrical undisturbed and remolded soil samples.
Following Compression tests can be carried out using this apparatus.
- Unconsolidated Undrained (UU)
- Consolidated Drained (CD)
- Consolidated Undrained (CU)
Supplied complete with Following Items.
- Triaxial cell for 38mm dia specimen
- Multi speed Loading Frame 50 KN with Load Cell
- Pore Pressure Transducer
- LVDT
- Air/Water Constant Pressure system with 3 HP air compressor.
- De-airing system with vacuum pump
- Automatic Volume change gauge
- Three Cell Saturation Device – wall mounted
- Split Molds
- Three Part split Molds
- Sample extractor etc.
Tri-axial Testing Machine with Data Acquisition System Comprising of the following :-
Digital Load Frame
It is an Advanced version of mechanical load frames. In this load frame rate of strain is controlled through combination of electronic and servo motor.
Specification :
- Capacity of the load frame – 50 kN
- Vertical Clearance – 325 mm
- Horizontal Clearance – 325 mm
- Platen Diameter – 150 mm
- Platen speed – 0.0001-9.9999 mm/min
- Weight – 110 kg App.
Triaxial cell
- Stationary bushing as per IS 2720 part XII for 38 mm dia specimen x 76 mm long.
- Consisting of Perspex chamber, anvil, loading pressure up to 10.5 kg/cm2 with oil plug, air vent and no volume change type valves and kit.
- Kit consists of plain Perspex disc pair 38 mm dia x 6 mm thick, metal/Perspex top loading pad, two way split former, pair of porous stones sheath.
- Stretcher – 12 nos, Rubber sheaths – 08 nos. ‘O’ rings one drainage connection including. 3 part split former with collar, base plate, hinged clamp.
- End former for 2 mm bore x 4 mm triaxial cell will be compatible for electronic outfit system.
Pneumatic Control Panel, 2 lines
The unit have precision pressure regulators for controlling confining pressure, back pressure Capacity : 10.5 kg/sq cm with mechanical volume change gauge
Air Compressors, 10kg/sq.cm.
It is a single stage compressor fitted over an air receiver, ON/OFF switch, Pressure gauge & pressure outlet valve are provided as standard.
Electronic Data Acquisition
The four Channel micro controller base signal conditioning & touch panel display unit is suitable to measure Axial Load, pore /back pressure, vertical displacement & volume change (optional) directly indicated in their respective engineering units during Triaxial testing. The system receives the output signal from the sensor i.e Load cell, pore/back pressure sensor attached to the Triaxial Shear Test apparatus. The data of all four channels of Triaxial shear test can be transferred to computer through Ethernet & can be online monitored.
The unit also provides the facility of online monitoring of data of all the sensor on Touch Panel Display provided at the front. Broadly the following facilities are incorporated in the system:
- Touch Panel is provided to perform various operations such as TARE, PROGRAMMING, START, STOP etc
- Independent Taring of each channel -Data transfer interval is programmable (between 10 second to 1 hour)
- Automatic data saving on stop bottom there are 25 set result having maximum of 200 data points per set can be stored in the electronic unit. The sample number can be programmed.
- Online data & time of test will be stored along with the data.
- Online (while the test is in progress) data transfer to the computer through Ethernet port.
Sensor Specification :
- Load Cell
- Capacity: 1000 kg
- Type: S -Shaped
- Excitation Voltage: 10VDC
- Nominal output: 3.0m V/V
- Non-Linearity: 1000 M Ohms
- Safe Over Load: 150% of rate capacity
- Ultimate Over load: 250% of rated capacity
- Temp. Range: 0° to 60° cc
- Temp. Effect on output: <1.0015% FSO/Degree CC
- Temp. Effect on zero: <1.0020% FSC/Degree
Pressure Transducer
- Capacity: 2000 Kpa
- Excitation Voltage: 12 VDC
- Nominal Output: 4-20mA
- Over Pressure Limit: 2 times F.S
- Burst Pressure : 3 times F.S
- Max. Loop Resistance : 100M Ohms at 50VDC
- Isolation Voltage : 250VAC
- Supply Current : 20mA for 4-20mA output
- Operating Temp. Range : -40°c to 50°c
Linear Variable Differential Transformer (LVDT)
- Stoke : +- 20mm
- Linearity Deviation: 1% of rated capacity
- Repeatability: +- 0.1% of rated capacity
- Hysteresis: +-0.5% of rated capacity
- Excitation:2- volt rms 2 KHz sinusoidal
- Sensitivity: 1m V/V/mm
- Safe Temperature Range: 0° -50° cc
- Core Fixture: Spring Loaded Plunger
Optional accessories shall be procured at extra cost (Refer to the Recommended Accessories Section)
- De-airing system with vacuum pump
- Automatic Volume change gauge
- Three Cell Saturation Device, wall mounted.
Note
Additional accessories Viz. Universal Triaxial Cell to test up to 100 mm size soil sample, Split Molds, Three Part split Molds, Sample extractor etc. can be quoted on request.
It is essential to use the Instrument with Servo Voltage Stabilizer. Warranty void in case of Non Compliance.
Power Supply : The unit operates on 220 Volts 50 Hz single Phase supply
