Germany WILL The large scale triaxial testing systems arecustomized construction system which isconfigured based on the testing requirements ofcustomer. It is used to perform static and dynamictests on specimen with large particle sizes e.g.dam ballast, railway ballast, gravels and etc. The loading frame is servo hydraulic type andcan perform up to 1000kN load on samples withdiameter up to 600mm. (The Ultra large triaxial isavailable on request up to 1000mm sample size). The Wide column spacing enables to accommodatethe large cells even with environmental chambersand furnace. The load frame has a pneumaticsliding system which provides an easy movementof triaxial cell out of the loading area and makesthe possibility of easier test set up handling foroperator. 

This machine gives a lot of flexibilities to the users to run advanced dynamic tests with high dynamicloads on large sample sizes. The high accuracy and different upgrading modules makepossibility to configure the test system which meets all your testing applications.When you have any testing applications, we can assist you in configuring a system to meet your testrequirements. All of our testing solutions are manufactured to the high quality and standards. Oursystem comes with a powerful dynamic controller up to 10KHz and this makes a unique feature forour machines in dynamic testing field. A unique and flexible software along with componentsbring you different possibilities to use the device and run your test in a better way.

This high quality stress path triaxial testingsystem are a modular solution and are consistingbasically of a rigid 2 column-load frame, adynamic actuator, a multi-channel high speedcontrol system with 24 bit resolution for dynamicaxis load and actuators for cell-pressure(Static orcyclic), back-pressure(Static or cyclic) and relevantmeasuring transducers.The powerful multifunctional GEOsys Softwaresupports all the test procedures with a well accessto all testing sessions.

System Geography

① Dynamic Servo-hydraulic Load Frame

② Hydraulic Power pack

③ Large scale Triaxial Cell

④ Upper moveable crossbar (Automatic movement)

⑤ Automatic Volume Pressure controller for Cell Pressure (Static and cyclic)

⑥ Automatic Volume Pressure controller for back Pressure (Static and cyclic)

⑦ Dynamic Controller

⑧ Software enables all kinds of static and cyclic Triaxial Tests

Servohydraulic Dynamic Load Frame

This loading system is specially designed and configured to perform dynamic tests on large sample sizesand is mounted on heavy duty steel table. The impact cylinder is mounted on the automatically hydraulicadjustable upper crosshead This allows the crossbar to be adjusted in line with all requirements andmake it convenient to do variety of tests such as concrete, soil, four-point bending or etc. It can beconfigured with different flow capacity servo valves to obtain the required dynamic amplitudes.

The actuator is located at upper crosshead and the power supply unit is located in special acousticenclosure. The cylinder and all its accessories have been enclosed for protection. Pneumatic sliding system which provides an easy movement of triaxial cell out of the loading area toprovide the possibility of easier test set up handling for operator.

Hydraulic Power Pack

Our series of hydraulic power-packs supply smooth hydraulic fluid to actuators, hydraulic pressure intensifiers, and servo hydraulic testing machines to meet their testing system demands. As the dynamic performance of a hydraulic system depends on input oil flow and pressure in cylinder therefor we offer a wide range of flow rates to meet required dynamic performance for your application. All components are mounted conveniently for easy access.

A key feature of our hydraulic power packs is that they offer demand-dependent flow-rate control, delivering at a constant pressure of 210, 280 or 340 bar. They can locate beside or in greater distance from load frame. An oil-to-water heat exchanger or air-cooling exchanger controls fluid temperature. A temperature switch turns the hydraulic power pack off when the temperature of the fluid exceeds a pre-set value – lights on a front panel are used to indicate temperature levels. Closed loop re-cooler system (chiller for Oil /Water Cooling) is available on request and can be integrated to the unit.

Front Panel Geography

indicators：Main switch、Emergency Stop、“Start”、“ON”(indicator light)、Reset、Manometer to operate pressures、Filter、Oil level (blinking)、Temperature (blinking)、Motor Temperature: The pump motor is overloaded、E-Stop: Illuminates after the emergency stop has been pressed

Air Cooling Method

Air cooling method uses a large fan which forces cooling air through the vanes of a radiator to reduce the temperature of hot oil quickly and efficiently. The hot oil is circulating in radiator to get cooler and gets working condition again. For large flow rate power pack, the fan generate larger amount of cooled air or it is recommended to use water cooling method.

Water Cooling Method

In this method a cooled water is reducing the temperature of oil to enable it to reach to working temperature condition. Depends on the flow rate of the power supply, the water flow rate be calculated correctly to give the good performance. The noise level of hydraulic supply units which use water cooling method is higher than Air cooled method. For example, the noise level of a hydraulic supply with flow rate of 7 LPM with water cooling method is 51dbwhich is super quiet while with air cooling is 62db (the values are measured in 1-meter distance form unit).

Large Size Triaxial Cell

This series of Triaxial cells are manufactured to perform static and cyclic tests on soils with large particle sizes which requires larger sample sizes as usual tests. The cells have stiff stainless-steel construction with transparent polymer cylinder which are reinforced with carbon fiber reinforcement for cell pressure up to 1 MPa. For pressures over than 1 MPa, the cell comes with a steel wall construction. This guarantees minimum cell expansion during the test. The sample size is up to 500mm and 1000mm height.

Static Cell And Back Pressure System

The cell and back pressure can be generated and controlled automatically by different configurations depends on the testing applications, laboratory utilities and technical requirements in a variety range of pressure and for different applications With both below configuration which automatic and are controlled via PC, Tests such as Saturation, stress/strain path, permeability, K0 and other tests can be easily performed with accuracy and precision.

A) Air Pressure Controller (APC)

The standard configuration of this series includes of one-off Air pressure controller (APC) to generate air pressures (e.g. confining and pore pressure), two-off Air/Water Bladder which acts as an interface to exchange pneumatic pressure into hydraulic pressure and one -off automatic water volume measuring device to measure volume changes.

This system is fully automatic system and is controlled via PC and dedicated software.

Working pressure: 2 MPa    Pressure outlet：3 for inner cell, outer cell and backpressure

B) Volume Pressure Controller (VPC)

This method included of two Volume Pressure controllers for applying back pressure and Cell pressure. These are syringe pulse-less pumps which generate and regulate pressure and provide flow control in a variety range for different testing requirements.

The control of the units is simply done via Touch-panel for stand-alone use or via PC and dedicated software. This making them very convenient and easy to operate.

Digital Controller

Digital High-Speed High Resolution Expandable Real Time Control and data acquisition System 10KHz control and data acquisition and 24 bit resolution. The Dynamic controller is suitable for screw driven instruments(electromechanical) , hydraulic instruments with a valve driven with ±10 Volt and variety of sensors e.g. load cells, LVDTs, strain gauges, extensometers, thermocouples and etc.

The multi-functionality of the controller allows a modular design of the measurement and control parameters (sensors) via intelligent sensor plug, which store the calibration parameters, thus depending on the application can be used flexibly.

Main Features

• Up to 32 low-noise closed-loop control channels for static and dynamic tests

• up to 24-bit resolution channels for each test axis (e.g. force, displacement, pressure, strain)

• With digital controller parameterization and bumpless switching between all control functions

• Smooth changeover between all control functions

• Complete, simultaneous data transmission to avoid any data loss

• Digital adjustable controller parameters (P-I-D parameter)

• Simple and flexible test or setpoint parameter adjustment

• I/0 processing of externally connected

• Configuration and setup with PC software