I. Overview

The YUC.IZZD-1 vibration triaxial test instrument, developed from the static triaxial test, is a high-end laboratory equipment for studying and testing the dynamic properties of soil, mainly for strain of 10^-4~10^-2 The range of sand liquefaction test, soil dynamic strength test, modulus damping test, measurement of dynamic stress, dynamic strain, pore water pressure, dynamic modulus, dynamic damping ratio and other correlations in the test process. With dynamic, static axial stress, lateral pressure and pore water pressure, axial loading program and other control functions.

By applying the dynamic stress of the cyclic load to the specimen, the deformation and breaking of the foundation in nature such as earthquake, wave fluctuation, rail transit, mechanical vibration, explosion and wind load are studied. At the same time, the dynamic reaction of the specimen under dynamic load was determined. This reaction is multifaceted, and the most fundamental and essential is the relation of dynamic stress (or dynamic principal-stress ratio) to the corresponding dynamic strain (σ_d-ε_dor σ₁/σ_3-ε_d), dynamic stress and corresponding void water pressure change. According to the relative relation of the three indexes of stress, strain and pore pressure, the unearthed dynamic modulus, dynamic deformation modulus, dynamic strength, damping ratio, liquefaction index, liquefaction strength and so on can be deduced.

II. Performance characteristics:

• Built-in battery, data visualization
• Universal network data transmission interface, real-time clock function
• Development of Special Dynamic Three-axis Control and Processing Software
• Storage mode adjustable; fixed time interval or fixed strain interval
• High precision servo motor control can realize both conventional static triaxial test and dynamic triaxial test
• 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 three independent control systems: axial pressure loading control system, confining pressure control system, reverse pressure body change and pore pressure measurement system.
• With high precision underwater load sensor, the load sensor is placed in the pressure chamber and in direct contact with the soil sample to reduce the friction force and the error of external factors to the test results
• Replaceable base and specimen cap to achieve different diameter soil test in the same pressure chamber (39.1 mm ,61.8 mm, etc., various sizes can also be customized)
• The double control mode of stress and strain can realize the dynamic test of strain control and the dynamic test of stress control
  III. Main technical parameters of the instrument:

• Driver: High precision servo motor
• Operating frequency :0-2Hz (standard)
• axial force: sensor with water distribution, maximum voltage resistance 2 MPa, range 0-3kN, accuracy <0.3% F.S, resolution 1N
• Axial deformation: range 0-50mm, displacement accuracy <0.3% F.S, resolution 0.001mm
• confining pressure: range 0-600 kpa, accuracy <0.3% f.s, resolution 1 kpa (depending on user requirements)
• Reverse pressure: Measuring range 0-1MPa, accuracy <0.3% F.S, resolution 1kPa
• Pore pressure: Measuring range 0-1MPa, accuracy <0.3% F.S, resolution 1kPa
• Volume change :0-250ml, accuracy <0.3% F.S, resolution 0.01ml
• Shear rate :0.001mm~30mm/min, stepless speed regulation
• Test dimensions :φ39.1mm ,φ61.8mm (other dimensions customizable)
• Pressure chamber :5MPa (customizable)
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