
This Unique experimental testing system is a customized solution used to study the behavior of rock under various dimensional and compressive stress regimes
(σ1 ≠ σ2 ≠ σ3). This fits to the research goals of geothermal energy researchers, hydrologists, petroleum reservoir engineers and researchers in the mining section, geophysics and geotechnical sectors.
The system is capable of testing a wide range of materials from granite to mudstones and also for post-failure regime of high-strength brittle rocks.
The rock Polyaxial testy system is designed to meet standard testing parameters or desired test conditions which is different for different applications. we are able to tailor our products and services to meet your aims and needs. Different upgrading options allow the user to set up his device with desired testing options. for different fields of testing e.g.:
• Rock mechanics research
• Mining and construction
• Exploration and production of fossil fuels
• Geothermal energy development
Polyaxial rock testing systems are designed to induce stress on cubic samples via three independent controlled principal axes (σ1 ≠ σ2 ≠σ3) up to 1200kN or higher stresses on request.
The sample chamber can house cubic samples up to 300 mm and has the option to be equipped with a temperature control up to 150 °C as well as a pore pressure device and the ability to have continuous acoustic emission recording, Ultrasonic tests ,Hydrofracturing and permeability(transient or steady state) measurements.
The complete system is fully automated and controlled by our flexible and programmable GEOsys Software. Various sensors, transducers, testing and experiment options are available.
Rock Polyaxial Testing Cell
The cubical polyaxial high pressure testing cell is mounted on a rigid frame designed to perform true triaxial tests on rock specimens. This makes it possible to test static stress-strain measurements in each of the principal stress directions (sigma 1, sigma 2, sigma 3). This cell is designed for different cubical specimen sizes up to 300 mm x 300 mm x 300 mm (larger sample size capacity available upon request. The cell is designed for injection of liquids (can be saline) into each surface of the cube for fracturing tests (borehole injection tests) or permeability tests under loaded conditions.
The below components are need for performing the tests. These tests can be carried out on a series of sample sizes under different stresses:
• 6 servo-hydraulic actuators with a capacity up to 1200kN
• Loading platen for each face
• Accuracy of pressure control 0.1%
• 6 incorporated high-resolution displacement transducers (LVDTs) for strain measurement in each stress direction, resolution 0.0001 mm

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 flowrates 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 or340 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).
Pressure Intensifier
Our pressure intensifiers provide closed-loop, servo-controlled pressure to test samples. This can be used to generate confining or pore pressure in connection with multi-channel electronically controlled systems that manage servo-valves mounted to intensifiers. They are also used to measure permeability or for hydro-fracturing tests. Intensifiers can be used to measure flow in permeability tests as well as volume change in triaxial tests while the required pressure is applied.
Separate hydraulic power is needed to supply a primary power source to the pressure intensifier which in Rock triaxial tests is our main hydraulic power pack. This pressurizes fluid to 21 MPa (3,000psi), which in turn fills the intensifier’s reservoir. The fluid in the reservoir can then be brought up to the required pressure by the intensifier e.g.140MPa or 210 MPa.
A double-pump or a dual piston intensifier with two servo-valves is available as an option for pressure or volume control when continuous flow is required.

Front Panel Geography
Diagram of valve schematic、Fluid level indicator、Pressure indicator、Manual valves (pressure on/off, and flushing valve or pressure supply/outlet as option)
And optionally on request can have: • Start/stop button • Visible electronic temperature indicator • Emergency shut down button

Pore Pressure System
The pore pressure units are used to saturate jacketed specimens, pressurize andcontrol pore fluid in the specimen and are used for permeability tests.
Our high precision syringe pumps for these applications although the pressure intensifiers which are similar to units for cell pressure are useful for this purpose.
Fluid pressurized by the pumps ore pressure intensifier is applied to one or both ends of the specimen. Operators can perform drained and undrained tests, and the displacement transducer allows calculation of the pore fluid flow rate.

Permeability Tests
The permeability test measurement is done by one or a combination of two pumps which are used to measure sample permeability by applying different pressures at each end of the sample, then measuring the pressure decay of the two ends over time. A set of end caps for permeability tests are available for each specimen diameter.

Hydraulic Fracture Test
The Main system is able to run hydrofracturing test in combination with a high-pressure syringe pump or High-pressure intensifier and relevant components which are used to apply constant high-pressure fluid through a steel tube on hollowed sample. The pressure applies on the centre of one side of cubical specimen while the specimen is under desired principal stresses and temperature. The dedicated software module would be integrated to main software for controlling the test.
To perform hydraulic fracturing test a borehole is drilled on center of one surface of sample and hydraulic fracturing port is embedded on this face and sealed at the loading plate. Then the required fracturing pressure would be applied to the pre-drilled borehole through the embedded port.

Temperature Control Package
This package allows the user to control and monitor the temperature from ambient temperatures to150°C with an accuracy of 0.1 °C inside the imaging cell.
The controlling of temperature form room temperature to desired temperature can be controlled by main software of the machine.
The dedicated method of temperature controlling includes of 9 special heaters on each platen side which are able to have a high range of heating rate to reach to desired temperature in lower time that conventional methods. The signals come to a controller to conduct a feedback control of the temperature, which is shown on an external display (on request) and within the software.

Ultrasonic Wave Maeasuring System
This is a complete system and is comprised of all required electrical and mechanical hardware e.g. signal conditioner and pulse generator, ultrasonic velocity and data acquisition controller, ultrasonic platens including combined P and S (OptionalS1 & S2) transducers as well as the required software. This package conducts ultrasonic velocity measurement tests on rock samples. The test is applicable at temperatures of 200°Cand pressures of up to 210 MPa.

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