Back Pressured Shear Box

  • Product Code: GDSBPS
Back Pressured Shear Box
Back Pressured Shear Box
ASTM D-3080 CEN ISO/TS 17892-10 JGS 0560 JGS0561
The Back Pressure Shearbox (BPS) has the ability to perform direct shear tests with precise backpressure control, for the recreation and measurement of realistic slope failures.

 The BPS range includes a saturated version (control of pore water pressure), an unsaturated version (control of both pore water and pore air pressure) and a dynamic version.

Feature & Benefits  
Internal loadcell: Internal loadcell for shear and optionally normal force for load measurements as close to the sample as possible for greater accuracy.
Optional low-cost version: Low-cost version available which uses hanging weights for axial load.
Rigid aluminium cell body: To reduce system compliance.
Unsaturated GDSBPS: The unsaturated GDSBPS is based on a standard, saturated device but modified to allow the measurement and control of matric suction (the difference between the pore air and water pressures).
Real-world situations to be modelled in the laboratory: All versions allow the pore pressures within the sample to be controlled. The control of pore pressure during direct shear testing allows real-world situations to be modelled in the laboratory.
Technical Specification  
Dimensions L= 875mm x W = 350mm
Displacement Accuracy <0.1% FSO
Displacement Resolution axial = +/-15mm, shear = +/- 25mm
Power 240V or 110V 50/60HZ single phase
Resolution of Measurement and Control 16 bit (± 25mm = ± 0.7pm(shear), ±10mm = ±0.3pm (axial)
Sample Sizes 75mm x 75mm (alternative sizes available on request)



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