Description
The TORSHEAR apparatus tests the residual shear strength of remoulded soil samples. The main advantage of this method compared to direct shear test consists in the continuous shear with a constant area during all the test long. This method allows us to recreate in the laboratory exactly the the field conditions, giving very accurate residual shear strength values. The sample is loaded vertically between two porous stones by means of a counter balance 10:1 ratio lever loading system. A rotation is imparted to the base plate and lower platen by means of a variable speed motor. The settlement of the upper platen during consolidation or shear can be monitored by means of a sensitive dial gauge or linear transducer bearing on the top of the load hanger. Torque transmitted to the sample is reacted by a pair of matched load measuring rings or load cells. Linear transducer and strain gauge load cells can be connected to the 30-WF6016 GEODATALOG for data acquisition and processing. See accessories. Using the waterproof membrane keyboard and the LCD display with 4 rows and 20 characters, it is possible to set the speed in deg/min, using also the fast approach for sample positioning. The test can be stopped using the keyboard or setting a limit of rotation or time. This apparatus is known as Bromhead Apparatus. Dr. Bromhead of Kingston University designed the Ring shear apparatus to overcome certain disadvantages of a conventional shearbox. Dial gauge or linear transducers, load ring or cells and weights are not included and have to be ordered separately. See accessories.
Technical Specs
- Microprocessor controlled drive system
- Speed range adjustable from 0.001 to 180°/min
- Rapid approach without any limit of rotation
- Serial port RS 232 for PC remote control
- Two measurement options: mechanical with load rings and dial gauge, and electronic with Data acquisition, with load cells, displacement transducer and Geodatalog Data acquisition system
Accessories
Electronic measurement option
27-WF2202/3
Pair of load cells 1 kN cap. with adapters
30-WF6207
Linear potentiometric transducer, 10 mm travel, complete with mounting block
30-WF6016/T3
Ring shear Geo-Analysis template.
Data acquisition system ( see the link products below)
Mechanical (manual) measurement option
27-WF2202/1
Pair of matched load rings, 1 kN capacity
30-WF6401
Dial gauge 12×0.002 mm
Weights for vertical load
27-WF2202/2
Set of slotted steel weights, total 50 kg
Stand (optional)
27-WF2202/4
Metal stand for 27-WF2202 apparatus
Spares
27-WF2202/5
Pair of porous stones
