Wille Geotechnik - Rock Polyaxial Testing System

(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.

Polyaxial rock testing systems are designed to induce stress on cubic samples via three independent controlled principal axes (σ1 ≠ σ2 ≠ σ3) up to 2000kN 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 +200 °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.

• High stiffness stand-alone construction design
• Six (6) hydraulic actuators to apply independent stresses (σ1 ≠ σ2 ≠ σ3) up to 2000kN
• Cubical chamber for different sample sizes up to 300×300×300mm
• High-pressure platens are combined with a friction reduction system
• Six (6) high-precision displacement transducers to measure strains on each face
• Dynamic high-speed, closed-loop control of load, displacement, position and volume or flow
• Flexible controlling software for almost unlimited test procedures of all polyaxial test applications
• Hydraulic power packs with high-quality noise protection and emergency functions
• Expandable real-time, high-resolution data acquisition and closed-loop control system

• Max Static Load : Up to 2000kN
• Min. Velocity : 0.01mm/min
• Max. Velocity : 90 mm/min
• Piston Stroke : 100 mm (+/-50 mm)
• Force Accuracy : 0.1% F.S
• Sample Size/s : 300x300x300mm, 200x200x200mm : 100x100x100mm or smaller

• Hydraulic fracturing tests on intact specimens
• Permeability tests on rock samples by using single or double pressure intensifiers
• Pore water pressure
• System for measuring P- and S-waves in combination with acoustic emissions
• Upgrading polyaxial tests to perform temperature control tests of up to +200° C degrees
• Creep test

GEOsys Software for user defined freely programmable test standard procedures and complex test sequences via structured Windows operations on a graphic user interface.

Through a series of menus, this provides quick access to all the controls needed for test set ups and follows standard test sequences.

The software is able to create an unlimited number of test stages with interactive and calculated parameters for closed-loop, real-time control. An unlimited number of control and measuring channels can be simultaneously controlled