Rock Shear Box Apparatus


This apparatus was originally developed at Imperial college, London, by Professor E. Hoek. It is a simple and practical method of determining the strength and slope stability of rock, both in the field and in the laboratory. The apparatus consists of a shear box designed to accept samples not larger than 115x125 mm, or alternatively cores up to 102 mm dia. The shear box consists of two halves, the upper being connected to two rams for reversible shearing action and the lower connected to a ram for normal load application. The loads are recorded by Bourdon tube load gauges or by pressure transducers (in this case external datalogger is needed).
The normal loading system is complete with an adjustable low friction pressure maintainer to absorb volume changes of the specimen during the shearing action and to ensure a constant vertical stress.

Two versions are available:
  • Basic model. It is supplied complete with: 5 digital gauges 25x0.001 mm (4 vertical and 1 horizontal); 2 mould formers; 2 hand operated pumps for lateral and vertical load fitted with Bourdon gauges. The pump for vertical load is fitted with a pressure maintainer to assure uniform load during the test.
  • Electronic model. It is supplied complete with; 5 potentiometric transducers with 25mm travel (4 vertical and 1 horizontal); 2 mould formers; 2 hand operated pumps for lateral and vertical load fitted with Bourdon gauges; 2 pressure transducers for the direct acquisition of the load values. The pump for vertical load is fitted with a pressure maintainer to assure uniform load during the test.

Displacement and load readings shall be acquired by suitable datalogger that has to be add as accessory. Two versions can be used to complete the testing configuration: standard model with dedicated display suitable for laboratory use or with battery operated model for on-site use. For more info please refer to Releted Products below and Accessories section.

The high alumina cement for the cementation of the sample is not included and have to be ordered separately. See Accessories
  • Shear box made in aluminium alloy
  • Maximun axial and shear load capacity: 50 kN
  • Reversable shear action with 48 mm stroke
  • Double version available: analogic and electronic
  • Data processing template available as accessory for the digital version
  • 2 mould formers included in the testing configuration 


  ASTM D5607

Technische specificaties

Technical Specifications

  • Max. axial and shear load capacity (for both models): 50 kN
  • Manometers range (for both models): 50 kN x 1 kN
  • Displacement reading (for Basic model): 5 digital gauges 25x0.001 mm 
  • Displacement reading (for Electronic model): 5 potentiometric transducers with 25mm travel 
  • Max. sample dimensions: up to dia. 102 mm (for core specimens) and 115 mm x 125 mm (for prism specimens)
  • Overall dimensions (loading frame only): 460x250x600 mm
  • Weight approx.: 45 kg

Order nummers


Rock shear apparatus to ASTM D5607. 


Electronic rock shear apparatus to ASTM D5607.  Datalogger NOT included. 

Accessoires & toebehoren


32-D0548/8: Mould former 32-D0548/9: High alumina cement. 50 kg bag. 32-P0070/6: MS Excel template for Direct Shear Strength Tests of Rock specimens according ASTM D5607 82-P9008/ELT: Set of four cables for connecting load cells, pressure transducers, strain gauges, LDT / LVDT / potentiometric type displacement transducers to DATALOG 8 (82-P9008) and GEODATALOG 8 ( 30-WF6008) 82-P9008/SOF:

DATACOMM 2 data acquisition software and LAN cablefor PC connection of DATALOG 8 (82-P9008, P9008/F) - Up to 8 datalogger (total 64 channels) can be connected to a single PC creating a modular network (LAN hub is required) 

: 82-P9008:

DATALOG 8, 8 channels stand alone multipurpose data logger. 110-230V / 50-60Hz / 1 Ph.

: 82-P9008/F:

DATALOG 8, 8 channels multipurpose data logger, battery operated and with rigid carrying case suitable for use on field. 110-230V / 50-60Hz / 1 Ph.