This apparatus, similar to one developed by Rock one developed by Rock Mechanics Centre, Imperial College, London, is used for practical rock testing
either in the field or laboratory.
The apparatus consists of a shear box in two parts which can accept samples of max. size 115 x 125 mm or cores upto 102 mm diameter. The lower half is fitted with two rams for reversible shearing action, and the upper fitted with a ram for normal load application. The normal loading unit is complete with low friction hardened rods to maintain constant normal load throughout the duration of the test.
The equipment comprises :-
The instrument is used for finding out the shear strength of rock specimen at predetermined angle.
It consists of two blocks which, with suitable adopters, can accept specimens ranging from ‘EX’ to ‘NX’ size, with diameter to length ratio of 1:1. The shearing angle can be adjusted at 30o, 35o, 40o, 45o and 50o. It can be used in compression testing machine with day light clearance of approximately 400 mm.
Equipment comprises the following:-
Hydraulic Loading unit of 250 kN capacity with maximum daylight clearence of 400 mm. The unit is fitted with 200 mm dia direct reading load gauge.
The system comprises of two controllers, hydraulic power pack with Tandem Pump to feed two actuators. Since the size of the box is 300 mm x 300 mm x 450 mm, it can take maximum rock specimens of 300 x 300 x 150 mm, naturally or artificially jointed, in any shape and form. All the parameters like normal load and shearing load either on strain basis or stress basis are controlled through the dedicated computer. On line graphical presentation is shown on the monitor. After the completion of the test the following graphs are plotted in window operated software.
The system includes :-
1) Loading Unit
It is a welded structure fitted with two actuators for normal and shear load. Box assembly can be moved out of the loading unit on the railings provided. This facilitates in the easy loading of the sample.
Capacity of the actuators
Comprises of :-
Power Pack
Capacity of the oil tank : 100 Ltrs.
Pumps tandem type : 30 Ltrs/min.
HP of the motor : 15 HP
Heat Exchanger : 10,000 k cal/hr.
Servo Valves : Moog/Tokyo
Instruments
Operating Pressure : 20 mPa.
Pressure Line Filters : 3 Microns Absolute
Accumulators : Piston Type, 1 Ltr. Capacity.
6) Computer Pentium IV with Data Acquisition Card (Dedicated)
Note : Higher sizes upto 1000mm x 1000mm x 1000mm on request
This apparatus is used to assess the resistance offered by a rock sample to weakening and disintegration when subject to drying and wetting in a slaking
fluid, usually water. The equipment meets the essential requirements of IS:10050-1981 and comprises the following
Suitable for operation on 220 v, 50 hz, single phase supply.
This light weight and portable compact hammer is used for rock classification test. Cylindrical cores, usually ‘NX’ size are held in horizontal position and the hammer mechanism impacted against the core to obtain rebound value. A series of rebound values are taken along the length of the core or rock mass to obtain average value.
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