| Conventional Triaxial
Test System |
A large number of conventional
type Triaxial Shear test equipments are available in
this laboratory for conducting strength tests under
different in situ conditions. Provision also exists
for conducting tests on soil samples of sizes upto 100mm
dia and 200mm height. |
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| Upgraded Triaxial Shear
Test Systems |
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A set of 20 upgraded
Triaxial Shear Test equipment are housed in the temperature
and humidity controlled dust- free environment laboratory.
The triaxial cells are of modular type which allows
testing of different sample sizes. One computer is exclusively
dedicated for acquiring test data from two triaxial
test equipments. A user friendly software enables monitoring
of test results at any instant during testing besides
interpretation of test results for arriving at various
design parameters. |
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Stress Path Triaxial Test System
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The Stress Path Triaxial
Test System is a unique sophisticated equipment capable of
characterising the strength characteristics of soil samples
under different stress paths by simulating the insitu conditions
in the laboratory. The system is equipped with software and
with a data acquisition system. |
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| Conventional Consolidometer Systems |
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This laboratory is equipped
with conventional type consolidometers for conducting one
dimensional consolidation test on more than 15 soil samples
at a time. |
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| Computer Controlled Consolidometer |
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The load unit totally
automates the conduct of a consolidation test of fine
grained soils. The system is capable of running a variety
of constant rate tests under various controlled conditions.
Further, the load application may increase
or decrease in any pattern by any amount as specified
by the user. In this system, provision exists for storing
the data in the computer for subsequent reduction and
interpretation for arriving at various design parameters.
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| Laser Particle Size Analyser |
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The GALAI CIS-1 available
in this laboratory is a comprehensive particle size
analysis system which provides accurate particle size
distribution besides particle shape characterizations.
In this system, a user friendly computer software is
utilised for scanning and interpretation of the particle
size distribution between 0.1 micron and 1,200 microns.
Within a short period of time a large number of samples
can be tested in this system. |
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| Proctor Compaction Test Systems
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This laboratory is provided
with a number of manually operated Proctor Compaction Equipment
for arriving at the compaction characteristics of borrow area
materials. However it is time consuming. To overcome this
difficulty, two sets of automated compaction equipment are
being used extensively in addition to conventional compaction
equipment for various ongoing project investigation works.
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| Permeability Tests Systems
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For determining the permeability
characteristics of core materials, a number of permeability
moulds are installed. In this set up, provision exists for
conducting tests at constant as well as variable heads. |
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| Sensitive Electronic Balances |
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The laboratory is equipped
with a number of sensitive electronic balances for determining
the weight of soils moisture content etc. accurately for conducting
various tests. |
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| Soil Dispersivity Identification
Test Set-ups |
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Experimental set-ups
for the identification of dispersive soils for embankment
dams viz. Sherard's Pin Hole Test Apparatus, Crumb Test,
Chemical Analysis of the Pore Water Extracts and SCS
Double Hydrometer test are available at CSMRS. A self
sponsored research programme was successfully completed
and based on this work, a draft ICOLD bulletin was prepared
and the same has already been published by ICOLD. |
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| Resonant Column/Torsional
Shear Device |
The equipment is used
to determine shear wave velocity, shear modulus and
damping ratio of soil under different confining pressure,
void ratios, shear strain amplitude, number of cycles
and time of confinement. A soil specimen in fixed-free
end conditions is either put to torsional simple shear
or in a fundamental torsional mode of vibration. From
theory of elasticity and geometric properties of specimen
the shear modulus can be determined. Damping ratio is
determined from decaying vibration or hystereses loop
characteristics. |
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| Cyclic Simple Shear Device
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The
device is used to evaluate cyclic shear strength, dynamic
properties and for studying the liquefaction parameters
of saturated cohesionless soils. A saturated cylindrical
disc soil specimen of 75 mm diameter and 20 mm height
is prepared on bottom platen which is fixed in the horizontal
direction. Vertical and horizontal load is applied to
the specimen by means of a pneumatic actuator. The horizontal
displacement and pore water pressure are monitored to
observe the effect of cyclic loading and to determine
liquefaction potential of the soils. |
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| Nuclear Density/Moisture
Gauge |
The surface gauge is used
to determine both density and moisture content by back scatter
and transmission technique. Nuclear source which produces
gamma rays is used to determine density and neutron radiation
source is used to measure moisture content. |
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| Cross-Hole Shear Wave
Apparatus |
The apparatus is used to
determine dynamic modulii of geological materials and to locate
water filled voids in soil and rock. In this method generally
three holes are drilled, shear waves are generated in one
of the holes at a given elevation and travel time of these
waves is measured in adjacent receiver holes at the corresponding
elevation with the help of the geophones. The velocity of
shear wave is calculated from the data & it is used to
evaluate the dynamic modulii. |
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| SPT Energy and Force
Calibrator |
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of determination of reliable and comparable SPT data by measuring
the energy trasmitted through drill rods during the test.
With the help of SPT calibrator the dynamic force of impact
in drill rods with the attached load cell is read on a digital
readout unit. The energy trasmitted to the sampler is displayed
as a percentage of standard energy of 4200 inch pound.
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| Electric Cone Penetrometer
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The equipment makes
use of tip resistance of a cone and sleeve friction
jacket beside pore pressure during its pushing in soil
to evaluate several soil properties like soil stratification,
undrained strength of clays, relative density of sands,
bearing capacity of cohesisonless soils, estimating
foundation settlements, over consolidation ratio and
pile bearing capacity. A seismic cone can also be used
for measuring the shear wave velocity in the ground.
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| Cyclic Triaxial Equipment |
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The equipment is used
for studying the effect of cyclic shear stress on soil
modelling the conditions during an earthquake. A cylindrical
saturated specimen is subjected to cyclic deviator stress
to study pore water pressure, deformation response and
effect of repeated loading conditions besides liquefaction
potential. |
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| Vibration Monitoring
Equipment (VME) |
| The VME having inbuilt software
with triaxial geophone is used for computation of peak velocity,
acceleration, displacement and vector sum i.e. the resultant
peak velocity. Each blast record contains the peak value,
its time of occurrence and its frequency for each of the geophone
channels and also a resultant peak particle velocity v/s time
graph. |
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| Ground Penetration
Radar (GPR) |
GPR is an ideal tool
for investigating geological structures up to a depth
of 20 m. It is used to locate cavities, voids, buried
metal objects, plastic containers, concrete or asphalt
foundations, oil/ petroleum spills, changes in geology,
hazardous waste evaluation. GPR uses the principle of
the reflection of electromagnetic waves to produce a
two dimensional cross section of subsurface. A trainsmitting
antenna transmits an electromagnetic wave into the ground
and reflected waves from objects of different electrical
properties from the surrounding ground are received
back on the receiver antenna, thereby generating a continuous
profile record as two way travel time versus distance
plot on a strip chart recorder. |
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| Compact 'G' Demonstration
Centrifuge |
The compact centrifuge is
useful for educational demonstration of stress- dependent
behaviour of earth structures in a very small model. The model
can be used to observe visually the behaviour of earth structures
for slope stability, bearing capacity and self-weight consolidation
of slurry clay. The rotating table of compact 'G' can be rotated
to r.p.m. to produce an acceleration of 500g.
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| Spectral Analysis of
Surface Waves (SASW) |
The SASW method is
non-destructive seismic method for in-situ evaluation
of shear wave profile of subsurface soil, elastic modulii
of soil/ pavement, thickness of layered systems, liquefaction
potential, deterioration process of runways, underground
obstacles and effectiveness of ground improvement. The
test utilizes a simple field procedure to generate surface
Rayleigh waves by a impact source. The waves are detected
by a pair of receivers and recorded. Time history display
obtained in field is analysed to get the shear wave
velocity profile. |
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| Large Size Oedometer
System |
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This
equipment is being used for the evaluation of deformation
and permeability characteristics of rockfill materials
under different stress conditions. A sample size of
100cm dia and 60cm height is tested in the Oedometer
System.
The system is fully computer controlled. Materials of
almost all the rockfill dams contemplated/under construction
particularly in the Himalayan region are tested in this
system for arriving at the requisite design parameters.
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| Large Size Direct Sherar
Box |
| This equipment is being
used for arriving at the shear strength characteristics of
rockfill materials under moist saturation condition besides
arriving at the residual shear strength of these materials.
A sample size of 100cm x 100cm is tested in this system. Further,
it is also possible to deploy this equipment at the site for
testing rockfill materials depending upon the requirements.
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| Large Size Triaxial
Shear Test System (Static) |
| A large size triaxial shear
system available in this laboratory is used for evaluating
the strength characteristics of prototype rockfill materials
by adopting parallel gradation and extrapolation techniques.
A sample size of 38.1 cm X 81.3 cm is tested in this system
under drained condition. |
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| Large Size Triaxial Shear Test System (Cyclic) |
A fully computer controlled large size triaxial shear
equipment is available in this laboratory for evaluating
the strength characteristics of prototype rockfill materials
under static as well as dynamic conditions by adopting
parallel gradation and extrapolation techniques. The
sample size of 50cm X 100 cm is tested in this system
under drained as well as undrained conditions. |
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