TT.IZZD-1 Intelligent Triaxial Tester

　　The dynamic triaxial tester is developed from the static triaxial test. By applying simulated active stress to the sample, it studies the natural forces such as earthquakes, ocean wave shocks, mechanical vibrations, explosions, and high-speed motion objects on the ground. Whether there is damage. At the same time, the dynamic response of the sample under dynamic load was measured. This response is multifaceted. The most basic and important are the relationship between the dynamic stress (or the specific force of the moving principal) and the corresponding dynamic strain (σd-εd or σ1 / σ3-εd), the dynamic stress and the corresponding gap. Variation of water pressure. According to the relative relationship between the three indexes of stress, strain and pore pressure, the dynamic elastic modulus, dynamic deformation modulus, and damping ratio of the soil can be derived for the dynamic analysis of the structure of the soil, and the dynamic strength of the soil including liquefaction Index, liquefaction strength, and analysis of the stability of the foundation and structure under dynamic action, as well as various dynamic elastic parameters and viscoelastic parameters, and the behavior of soil samples under dynamic stress that simulates some actual vibration.

　　TT.IZZD-1 intelligent dynamic triaxial tester is a set of high-end laboratory equipment for researching and testing the dynamic characteristics of soil. It is mainly used for sand liquefaction tests in the range of 10-4 ~ 10-2. Dynamic strength test and modulus damping test, to determine the dynamic stress, dynamic strain, pore water pressure, dynamic elastic modulus, dynamic damping ratio and other related data during the test. With dynamic and static axial stress, lateral pressure and pore water pressure, axial loading procedures and other control functions.

second,main feature

　　Third, the test can be carried out

　　Consolidated Drained Triaxial Test (CD), Consolidated Undrained Triaxial Test (CU), Unconsolidated Undrained Triaxial Test (UU), Stress Control or Strain Control Dynamic Loading Test, Soil Permeability Test.

　　Fourth, upgrade options

　　Bending element test, Hall effect local strain sensor, LVDT local strain sensor, unsaturated soil test, temperature control test.

　　Five, the main technical parameters

　　Actuator: High-precision servo motor

　　Maximum dynamic load of axial vibration: 2Hz / 4KN

　　Axial force: with underwater sensor, maximum pressure 7Mpa, range 4KN, accuracy <0.1% F.S, resolution 1N

　　Axial deformation: measuring range 100mm, displacement accuracy <0.1% F.S, resolution 0.001mm

　　Confining pressure: range 900Kpa, accuracy <0.1% F.S, resolution 1kPa

　　Back pressure: range 2Mpa, accuracy <0.1% F.S, resolution 0.1kPa

　　Pore ​​pressure: range 1Mpa, accuracy <0.1% F.S, resolution 0.1kPa

　　Volume change: 0-250ml, accuracy <0.1% F.S, resolution 0.01ml

　　Shear rate: 0.001mm / min ~ 30mm / min, stepless speed regulation

　　Test size: φ39.1mm, φ61.8mm (other sizes can be customized)

　　Pressure chamber pressure: 7Mpa

　　Configuration and options of the system

　　Data acquisition and digital control system The system adopts a 32-bit high-speed ARM processor, with digital circuits for closed-loop control of displacement and load; equipped with 24-bit data acquisition (A / D); equipped with a high-precision proportional valve, which can be accurate and stable Control confining pressure; equipped with 800x600 LCD touch screen to display various test indicators; equipped with high-speed RJ45 network port to achieve communication with computer software;

　　High-precision servo motor loading system

　　The servo point motor is used to control the loading and loading system, which can efficiently and accurately control the axial displacement and pressure. This system is an important part of the dynamic triaxial experiment. The key function of applying dynamic displacement. It uses a servo control system and a precision ball screw to advance the loading platform to apply axial load to the pressure chamber. It can perform stress and strain triaxial tests of open-loop and closed-loop control. The static loading rate (0.001 ~ 30 mm / min) of the system is composed of a servo motor, a driver, a microcontroller control system, and a load sensor. Under dynamic loading conditions, the system is controlled by a single-chip microcomputer for dynamic displacement settings for multi-axis strain controlled triaxial experiments.

　　High-precision pressure / volume controller (larger range can be customized according to demand)

　　Equipped with a set of 2MPa / 250cc pressure / volume controller for controlling back pressure control and displacement measurement. It can realize two loading modes: constant current and constant pressure; built-in overload and overpressure protection device, pressure measurement accuracy is full scale. 0.1%, resolution is 0.1kPa, volume measurement accuracy is 0.1% of full scale, resolution is 0.01ml

　　Underwater load sensor

　　Built-in 4KN underwater load sensor, maximum pressure resistance 7Mpa, accuracy is 0.1% of full scale, resolution 0.1N

　　Computer data acquisition and processing software

　　A set of software platform that integrates control, acquisition, and processing. It uses network communication to control the test in real time. It has a data acquisition function and can run offline, and the data can be read by the instrument after the test is completed. Specific data processing functions, plotting mole Envelope, calculate C, φ, draw hysteresis, and so on.

　　Moving triaxial experiment instrument pressure chamber

　　The pressure chamber of the moving triaxial tester is the main core part of the test. It consists of a soil sample, a soil sample base, a soil sample cap, and a latex film wrapped around the soil sample. , Aluminum alloy base, top cover, pressure transmitting piston, piston sleeve, confining pressure proportional valve loading system and pore pressure sensor at the bottom of the pressure chamber, back pressure, intake and drainage, pore pressure and other pipes, as well as various sensor cables Fastener interface and valve.

　　Confining pressure control device

　　Under normal circumstances, the confining pressure is controlled by a hydraulic device. However, due to the fluctuation of the confining pressure caused by vibration, the device currently uses air pressure control. Air pressure control is provided by an inlet proportional valve which provides a stable air pressure source. Pressure range: 0 ~ 900Kpa This method is easy to operate. If necessary, add fresh water to the upper drainage position in the pressure chamber, and then perform air pressure control.

　　Department of back pressure body deformation and pore pressure measurement

　　The application of back pressure is mainly to solve the saturation problem of soil samples. Of course, there are many ways to solve the saturation problem: vacuum pumping saturation, head saturation, and back pressure saturation. For general cohesive soil permeability coefficient: greater than n * 10-7cm / s, a back pressure volume change system, that is, a hydraulic controller, can be used to compress the air bubbles in the soil to increase its saturation. Back pressure is applied to one end of the sample, and the other end of the soil sample is allowed to drain, so that the air bubbles of the soil sample can be removed under the action of circulating water, and the body deformation can be measured. Or directly enter the computer.