Login

Combined Shear and Triaxial System

The combined modular direct shear and triaxial test system is designed to determine the shear strength of intact, joint rock or concrete samples. Different sample sizes can be tested by our system, be they cylindrical, prismatic, cubical or irregularly shaped.

The high stiffness system with different accessories and options makes it possible to perform a variety of tests with one single device.


  • Highly stiff and robust loading frame with a large testing area
  • Precise force transducers to measure and control shear and normal stress
  • Hydraulic power packs with high-quality noise protection, as well as emergency functions
  • The shear boxes consist of a tilting free lower and upper shear frame, which is guided by linear bearings, a fixed upper shear frame and a guided load piston
  • High-speed, closed-loop control of load, displacement, position and volume or flow
  • Possibility to apply different stress paths or strain rates load independent shear rates (shear stress optional) via a micro-processor controlled high-quality servo-valve
  • Suitable for precise direct shear and triaxial tests on rocks, sliding surfaces and building materials
Load type servo-hydraulic
Axial force up to 5000 kN
Shear force 100 - 1000 kN
Specimen Size up to 300×300×300 mm
Accuracy  0.1%
Settlement, resolution 50/0.001 mm
Shear displacement 50 mm/100 mm
Cyclic Load on request

Or customized on request

  • Permeability tests on Rock samples by using single or double pressure intensifiers of up to 150MPa (steady or unsteady state)
  • Ultrasonic velocity measuring
  • Acoustic emission tests (3D)
  • Hydraulic fracturing tests on intact specimens
  • Environmental temperature chamber to conduct triaxial tests under ambient conditions
  • Creep tests

GEOsys Software for user defined freely programmable test standard procedures and complex test sequences by 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 of creating 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-2664
  • Standard Test Method for Triaxial Compressive Strength of Undrained Rock Core Specimens Without Pore Pressure Measurements (withdrawn 2005, replaced by ASTM D7012)

  • ASTM D-5084
  • Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter

  • ASTM D-5407
  • Standard Test Method for Elastic Moduli of Undrained Intact Rock Core Specimens in Triaxial Compression without Pore Pressure Measurement (withdrawn 2005, replaced by ASTM D7012)

  • ASTM D-5607
  • Standard Test Method for Performing Laboratory Direct Shear Strength Tests of Rock Specimens Under Constant Normal Force

  • 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

  • Land sliding
  • Slope stability
  • Deep excavations
  • Buried structures
  • Seismic investigations
  • Embankment, dams and other earth structures
  • Deep foundation on and offshore