Basic Introduction of GDS Instruments

1
Basic Introduction of GDS Instruments GDS
Instruments (A Division of Global Digital Systems
Limited), U.K.
2
List of GDS Products

• Instrumented Hoek Cells
• Consolidation Testing System - GDSAOS
• Direct and Simple Shear Systems
• Environmental Triaxial Range
• GDS Rock Mechanics Range
• Advanced Dynamic Triaxial Testing System(DYNTTS)
• Hydraulic Resilient Modulus Testing System
• GDS SASW and CSWS
• GDS True Triaxial Apparatus
• GDS Triaxial Automated System (GDSTAS)
• GDS Triaxial Testing System (GDSTTS)
• Hollow Cylinder Apparatus(GDSHCA)
• Pressure and Volume Controllers
• Resonant Column Apparatus (RCA)
• Unsaturated Soil Testing System (UNSAT)

3
Instrumented Hoek Cells
1
GDS Instrumented Hoek Cell is very versatile
equipment on research focused, operated with
70mpa Cell and maximum loads up to 2MN.
Applications

• Embankment Dams Testing
• Tunneling Testing
• Construction Testing
• Landslides Testing
• Offshore Testing
• Pavement and Highways Testing
• Piling Testing

Axial Load Dimensions 381mm diameter,
305mm high Pressure Range (MPa) 70 Sample
Sizes 38 x 76.2 and 50.8 x 101.6 Weight Approx.
(kg) 180
Technical Specification
Request a Quote
4
Consolidation Testing System - GDSAOS
2
This is a modern replacement for a traditional
hanging weight Oedometer. For Consolidation
Testing of Soil.
Applications

• Construction Testing
• Embankment Dams Testing
• Offshore Testing
• Unsaturated Soil Testing in the Laboratory

Axial Force Accuracy 0.1FRO, Dimensions W/D/H
- 220mm, 180mm (260mm including keypad),
485mm Displacement Accuracy 0.1 - dependent on
transducer selected Load Range (kN) Max Load
10kN Power 110 to 240 AC Volt Input,
60Watts Sample Sizes 50, 63.5, 71.4, 75, 101.6
112.8 mm (Other sizes available by request).
Technical Specification
Request a Quote
5
Direct and Simple Shear Systems
3
Some of the most popular systems are
1.Electromechanical Dynamic Simple Shear 2.
Variable Dynamic Simple Shear 3. Advanced
Dynamic Simple Shear 4. Ring Shear 5. Interface
Shear 6. GDS Shear Base System
GDS Instruments leads the world with its Shear
testing systems in both high pressure, low
pressure and unsaturated versions.
Measurement of Shear Strength of Soil and Rock
under various conditions.
Applications
Actuators 3 x electromechanical, high accuracy,
encoder controlled actuators. Axial Force
Accuracy Typically lt0.1 Axial Load
5kN Displacement Resolution 0.3um Load Range
(kN) 5kN normal force, 2kN on each shear
measurement (y and z). Operating Frequency (Hz)
1Hz Sample Sizes 50mm 70 diameter, 20 to 30mm
height
Technical Specification
(Variable Dynamic Simple Shear)
Request a Quote
6
Environmental Triaxial Range
4
Environmental Triaxial Range Products are the
temperature controlled testing systems for stress
path testing.

• Frozen Soils Testing
• Temperature Controlled Testing
• Gas Hydrate Testing
• Construction Testing
• Embankment Dams Testing
• Piling Testing
• Tunneling Testing

Applications
Pressure Range (MPa) 10 Sample Sizes Max length
100mm, Max diameter 55mm
Technical Specification
Request a Quote
7
GDS Rock Mechanics Range
5
GDS Rock Mechanics Range A high load, high
pressure load frame based triaxial testing system
for accurate testing of rock samples.

• Local Strain Measurement
• Unsaturated Testing
• Bender Element Testing

Applications

• This 16 bit device has 8 computer controlled gain
  ranges specifically designed to suit transducers
  used in a testing test
• /-10mV, /-20mV, /-30mV (load cells)
• /-100mV, /-200mV (pressure transducers)
• /- 1V, /- 5V, /- 10V (displacement transducers)

Technical Specification
Request a Quote
8
Advanced Dynamic Triaxial Testing System(DYNTTS)
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It is a high-end, no compromise testing apparatus
combining a triaxial cell with a dynamic actuator
capable of applying load, deformation and
stresses up to 10Hz.

• Earthquake Testing
• Offshore Testing
• Construction Testing
• Embankment Dams Testing
• Frozen Soils Testing
• Piling Testing
• Temperature Controlled Testing
• Tunneling Testing

Applications
Actuators High accuracy electromechanical Axial
Force Accuracy lt0.1 Axial Load 10kN, 20kN,
25kN, 40kN or 60kN Computer Interface
USB Displacement Range 100mm Displacement
Resolution 0.20um Operating Frequency
(Hz) Resolution of Measurement and Control
10kHz control cycle Sample Sizes up to 300mm
Request a Quote
Technical Specification
9
Hydraulic Resilient
Modulus Testing System
7
It enables the resilient modulus and permanent
deformation of unbound base/sub-base pavement
materials to be determined. 
Hydraulic Resilient Modulus Testing System
Applications
Data Acquisition 16 Bit Load Range (kN) 28
or 50 Operating Frequency (Hz) 10 Pressure
Range (MPa) 1 as standard Sample Sizes 38 to
150 as standard
Technical Specification
Request a Quote
10
GDS SASW and CSWS
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The difference between the systems are that the
CSWS system uses a ground vibrator as the source
of the energy, and the SASW uses an impact source
(usually a sledge hammer).
SASW - It allows fast, non-invasive testing for
all soil types, including residual soils and
fractured soft rock. 
Applications
CSWS - CSWS system typically measures to
penetration depths between 2 and 3 times that of
the SASW system.
Technical Specification
Technical Specification
Continuous Surface Wave System (CSWS)
Spectral Analysis of Surface Waves (SASW)
Computer Interface USB Connection Dimensions
400mm x 380mm x 150mm Power 12-24V DC Weight
Approx. (kg) 5.5
Computer Interface USB Connection Dimensions
Unit 400mm x 380mm x 150mm and Ground vibrator
450mm x 350mm x 180mm Power 12-24V DC Weight
Approx. (kg) Ground Vibrator 70
Request a Quote
11
GDS True Triaxial Apparatus
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The GDS True Triaxial Apparatus (GDSTTA) has the
defining characteristic that, unlike conventional
triaxial apparatus, all three principal stresses
can be controlled independently, rather than just
two in a conventional triaxial system. 
Applications

• True Triaxial Testing of Soils
• Construction Testing
• Earthquake Testing
• Embankment Dams Testing
• Piling Testing
• Tunneling Testing
• Unsaturated Soil Testing in the Laboratory

Actuators 4 Axial Force Accuracy 0.1
FRO Computer Interface USB Operating Frequency
(Hz) 0 to 5 Pressure Accuracy Dependent on
chosen pressure controller Sample Sizes Max 75
x 75 x 150mm
Technical Specification
Request a Quote
12
GDS Triaxial Automated System (GDSTAS)
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Its is a load frame-based triaxial testing
system. The system is configured by choosing from
a range of load frames, triaxial cells, pressure
controllers and software.

• Landslides Testing
• Tunneling Testing
• Embankment Dams Testing
• Construction Testing
• Piling Testing

Applications
Computer Interface ADV (RS232 OR IEEE), STD
(USB), EL (USB) Load Range (kN) Standard Set-up
(STDTAS) 50, 100, 250, 500, Advanced Set-up
(ADVTAS) 50, 100, 250, 500, High Pressure Set-up
(HPTAS) 50, 100, 250, 500, 1000, 2000 Pressure
Range (MPa) Standard Set-up (STDTAS) 1,
Advanced Set-up (ADVTAS) 1 to 8, High Pressure
Set-up (HPTAS) 8 to 100. Sample Sizes 38mm to
300mm
Technical Specification
Request a Quote
13
GDS Triaxial Testing System (GDSTTS)
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The GDS Triaxial Testing System (GDSTTS) is a
fully automated triaxial testing system designed
principally for stress path testing.

• Automated Triaxial Testing of Soil
• Tunneling Testing
• Embankment Dams Testing
• Construction Testing

Applications
Request a Quote
Technical Specification
Accuracy of Pressure Measurement Standard Set-up
(STDTTS) lt0.15 full range Accuracy of Volume
Measurement Standard Set-up (STDTTS) 0.25
measured value Load Range (kN) Standard Set-up
(STDTTS) 7 or 25 , Advanced Set-up (ADVTTS) 7
or 25 Pressure Range (MPa) Standard Set-up
(STDTTS) 1,2,3,4 , Advanced Set-up (ADVTTS) Up
to 10, High Pressure Set-up (HPTTS) Up to
10. Resolution of Pressure Measurement Standard
Set-up (STDTTS) 1kPa, Advanced Set-up (ADVTTS)
0.1kPa Sample Sizes 38mm to 300mm
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Hollow Cylinder Apparatus(GDSHCA)
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It allows for rotational displacement and torque
to be applied to a hollow cylindrical specimen of
soil.
Applications

• Earthquake Testing
• Construction Testing
• Embankment Dams Testing
• Offshore Testing
• Unsaturated Soil Testing

• Axial Displacement Encoder lt1µm
• Axial Load lt0.3N (For 10kN system)
• Axial/Torque Force Range 10kN/100Nm,
  10kN/200Nm, 12kN/200Nm, 15kN/400Nm
• Dimensions 700 X 700 X 1000mm (cell de-mounted)
• Load Range (kN) 10, 12 or 15
• Pressure Range (MPa) 1, 2
• Sample Sizes 100/60/200 or 200/160/400 (OD, ID,
  height)
• Weight Approx. (kg) 500

Technical Specification
Request a Quote
15
Pressure and Volume Controllers
13
GDS Advanced Pressure/Volume Controller (ADVDPC)
is a general-purpose water pressure source and
volume change gauge for the precise regulation
and measurement of fluid pressure and volume
change.
Applications
Pressure and Volume Control

• Accuracy of Pressure Measurement lt0.1 full
  range
• Computer Interface RS232
• Axial/Torque Force Range 820mm x 230mm x 220mm
• Dimensions 820mm x 230mm x 220mm (2MPa 20cc
  Version)
• Power 92-265v, A.C. 48-440Hz, 65w Maximum
• Volume Capacity 200cm3 or 1000cm3
• Weight Approx. (kg) 20

Request a Quote
Technical Specification
16
Resonant Column Apparatus
14
In research and commercial laboratories to
estimate values of the shear modulus, G, and
damping ratio, D, for soil specimens.
Applications

• Study behavior of Soils under Resonance
• Gas Hydrate Testing
• Temperature Controlled Testing
• Offshore Testing
• Pavement and Highways Testing

• Operating Frequency (Hz) 0 to 300Hz
• Pressure Range (MPa) 1MPa (Standard), 2MPa, 3MPa
  and 25MPa
• Axial/Torque Force Range 50mm, 70mm, 100mm,
  150mm

Technical Specification
Request a Quote
17
Unsaturated Soil Testing System (UNSAT)
15
Unsaturated Soil testing can also be added to the
following test types, Shear, Hollow Cylinder,
Resonant Column, Consolidation and True Triaxial
Testing.
Applications
Unsaturated Triaxial Testing of Soil
Technical Specification

• Accuracy of Volume Measurement Method A
  (0.25), Method B (lt0.04 or 32mm3), Method C
  (lt0.25), Method D (lt0.8 or 0.1).
• Sample Sizes Any size available, constraint is
  the cell size.

Request a Quote
18

• GDS Instruments - Established in 1979, GDS
  Instruments, a division of Global Digital Systems
  Ltd, is a world leader in the manufacture of
  laboratory and field testing equipment for use by
  geotechnical engineers and geologists continue to
  develop hardware and software based solutions to
  our users problems.
• Aimil Ltd We are the trustworthy distributor
  and supplier of GDS Instruments in all over
  India.
• Contact Address
• Get In Touch
• 91 11 3081 0200 (H.O.)
• Naimex House A-8, Mohan
  Co-operative Industrial Estate,
  Mathura Road, New Delhi - 110 044
• 1800 3002 0330 (Service Toll Free
  Number)
• info_at_aimil.com

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