Mécanique des roches

Rock mechanics

Semi-automatic Uniaxial and Triaxial test system. Basic test apparatus

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PRINCIPALES CARACTÉRISTIQUES

Semi-automatic Uniaxial and Triaxial test system based on semi automatic compression machine 50-C56B02, manually-operated pump 32-D0558, Hoek cell NX type 32-D0556 and Datalog 8 channels 82-P9008

DATALOG 8, 8 channels stand alone multipurpose datalogger model 82-P9008,

Uniaxial test: detail of rock sample fit with three strain gauges 82-P0392

Hoek cell supported by holding device model 32-D0556/H

Low friction manual pressure maintainer for lateral pressure model 32-D0558

Suitable for determining elastic modulus and strength characteristics of rock specimens under uniaxial and triaxial conditions
Composed by 2 indipendent systems: high stiffness compression machine and low friction manual pressure maintainer
Max working lateral pressure: 70 MPa
Advanced external data acquisition system with new touch screen Datalog 8

DESCRIPTION GÉNÉRALE

The Semi-Automatic configuration for determining the elastic modulus and strength characteristics of rock specimens is based on the compression machine with DIGIMAX control system for axial loading and manually-operated pump for confining pressure. It performs either uniaxial or triaxial tests under load/stress control (no strain).
The 2 systems are operated independently and the failure envelope is obtained by a series of individual tests (single - stage) with manual adjustment of the axial load and manual application of the confining pressure at different levels.

Note: For a typical configuration of an Semi-Automatic triaxial test system see Additional information.

TEST PROCEDURE:

axial and confining stresses are independently increased isotropically up to a defined level: axial load is controlled by a special pressure-compensated proportional valve; confining pressure is controlled by the manual pump with pressure maintainer;
cell pressure is maintained constant and axial stress is constantly increased by the pressure-compensated proportional valve up to specimen failure (single-stage);
the procedure above is repeated N times using new specimens at various confining pressure levels. Combining these results it is possible to plot the failure envelope with N points using the dedicated MS Excel spreadsheet.
strain values are acquired by Datalog 8 datalloger.

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Informations
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Technical specifications

Lateral pressure system
The 32-D0558 Low friction manual pressure maintainer is used for maintaining constant the desired lateral pressure in the Hoek triaxial cells. The unit comprises a hand pump connected to a special oil reservoir, a precision pressure gauge, a pressure maintainer and a flexible hose 3 m long with a 90° quick release coupling.

Max working pressure: 70 MPa
Weight approx.: 15 kg

Ordering info

Compression machine
50-C56W02
Wizard Auto compression Testing machine 3000 kN cap. with Semi-automatic Uniaxial and Triaxial test system, manually-operated with pump 32-D0558, Hoek cell NX type 32-D0556 and Datalog 8 channels 82-P9008. 230 V, 50 Hz, 1 ph
For more info see link to other products below

Lateral pressure system
32-D0558
Low friction manual pressure maintainer for lateral pressure

Accessories

Please refer to the links to other products below for more technical and commercial info about:

Compression frames
Hoek cell and sample extruder
Strain gauges for uniaxial and triaxial tests
Compression device for uniaxial tests
Multipurpose data logger

Additional Information

Typical configuration of a standard semi-automatic system for uniaxial and triaxial tests on rock specimens

AXIAL LOAD UNIT AND TEST FRAME

Code	Description	Uniaxial Q.ty	Triaxial Q.ty
50-C56W02	Wizard Auto Compression testing machine 3000 kN cap.	1	1
50-Q0050/HRD	Upgrading of the 50-C46xx and 50-C56xx series compression frames with upper and bottom platen dia 300mm min. hardness 58 HRC	1	1
50-C0050/CAL	Special calibration procedure assuring Class 1 from 1% of full scale	1	1
50-C9086/P	Distance piece dia. 200x100 mm	1	-
50-C9083/P	Distance piece dia. 200x68 mm	2	1
50-C9080/P	Distance piece dia. 200x30 mm	1	-

CONFINING PRESSURE

Code	Description	Uniaxial Q.ty	Triaxial Q.ty
32-D0558	Low friction manual pressure maintainer	-	1
32-R0023	Three way connector	1	2
82-P0700	Pressure transducer 700 bar cap.	1	2
82-P0349/ELT	Connection cable to Datalogger	1	2

HOEK CELLS (different sizes available. We propose NX model.

Code	Description	Uniaxial Q.ty	Triaxial Q.ty
32-D0556	Hoek cell, NX 54.7 mm dia.	-	1
32-D0556/A	Pair of load spreader	-	1
32-D0556/B	Distance pad	-	1
32-D0556/1	Spare rubber membrane	-	5
32-D0577/B	Rock sample extruder	-	1
32-D0577/4	Extruder adapter set for NX specimens	-	1

UNIAXIAL COMPONENT

Code	Description	Uniaxial Q.ty	Triaxial Q.ty
32-D9035	Compression device for samples up to 55mm diameter x 110 mm height	1	-

STRAIN READING (select the suitable strain gauges within the models listed below)

Code	Description	Uniaxial Q.ty	Triaxial Q.ty
82-P9008	8 channels stand alone multipurpose data logger	1	1
82-P9008/ELT	Set of four connection cables	1	1
82- P9008/SOF	DATACOMM 2 data acquisition generic software	1	1
82-P0398	Electric device to complete and compensate up to four Wheatstone bridges with ¼ or ½ bridge set up	1	1
82-P0399/C	Strain gauge application kit	1	1
82-P0399/1	Connecting terminals. 50 pairs sheet	1	1
82-P0390	Strain gauge, grid width 4.53x9.53 mm. Pack of 10	1	1
82-P0391	Strain gauge, grid width 3x20 mm. Pack of 10	1	1
82-P0392	Strain gauge, grid width 2x30 mm. Pack of 10	1	1
82-P0393	Strain gauge, grid width 1x60 mm. Pack of 10	1	1
82-P0070/3	MS EXCEL Template for stress/strain analysis, Elastic Modulus and Poisson's ratio processing in uniaxial and triaxial tests (single stage)	1	1

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