Rock Polyaxial Testing System

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.

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.

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Features
Specifications
Upgrade Options
Software
Standards
Applications

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

ASTM D-5084

Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter

ASTM D-7012

Standard Test Methods for Compressive Strength and Elastic Moduli of Intact Rock Core Specimens under Varying States of Stress and Temperatures

ASTM D-7070

Standard Test Methods for Creep of Rock Core under Constant Stress and Temperature