I. Overview

The YUC.IZZ-1 intelligent true triaxial test instrument is a special geotechnical test instrument which uses a computer to collect data by means of various sensors (force sensors, displacement sensors, anti-pressure body change sensors, pore pressure sensors, etc.) under the action of the surrounding pressure, that is, large principal stress, medium principal stress and small principal stress, and carries out data processing according to the relevant mathematical model. The instrument can be consolidated in isotropic direction, K₀consolidation as well as true triaxial tests of UU, CU, CD, etc under different principal stress ratios.

 The true triaxial experiment instrument is based on the common triaxial load on different principal stress directions and obtains the three directions respectively. In this case, the stress-strain relation in three directions and the corresponding modulus and strength index can be sorted out.

II. Performance characteristics:

• Built-in battery, data visualization
• Universal network data transmission interface, real-time clock function
• Independent Development of Special Real Three-axis Control and Processing Software
• Storage mode adjustable; fixed time interval or fixed strain interval
• Equipped with 800-600 dot-array color touch screen, the current data can be displayed in real time during the test
• Offline operation, instrument built-in data storage system, to be tested from the instrument to upload data to the computer storage and processing
• Using the inlet proportional valve to control the confining pressure, the accuracy error range can be controlled <0.1%.The pressure control is stable and the controller doesn't consume any extra gas when working
• The instrument has four independent control systems: axial pressure loading control system, confining pressure control system, and central principal stress control system. reverse pressure change determination system.
• Double control mode of stress strain
  III. Main technical indicators:

•  Sample Size :70 mm ×70 mm ×120 mm (specimen sizes of different specifications can be adjusted according to requirements)
• Large principal stress :0~3.6 MPa
• Main stress :0~1.2 MPa
• Small principal stress :0~900 KPA
• Pore pressure U :0~1 MPa
• Reverse pressure :0~1 MPa
•  Displacement: large principal stress direction 0~20mm, small principal stress direction 0~8mm
• Body change :0~100ml
• Charge rate :0.001-4.8mm/min (NC CVT)
•  Sensor measurement accuracy: system error less than 0.3%-0.5%