The document discusses the field vane shear test, an in-situ geotechnical method used to evaluate the undrained shear strength of saturated clays. It highlights the differences between undisturbed and remolded soils, the significance of soil sensitivity, and the procedures for both field and laboratory testing. Benefits include its simplicity and cost-effectiveness, although it is not suitable for certain soil conditions.

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FIELD VANE
SHEAR TEST

2. REPORTERS FOR TODAY
JOHN FEL
Reporter 1
CZARLON
Reporter 2
SALIC
Reporter 3
ALDRIN
Reporter 4

3. ALEC SKEMPTON
1948
First to demonstrate the
field vane shear test and
concluded that the field
vane test provided an
efficient method of
obtaining the sensitivity
of soil

4. What is…..
Field Vane Shear Test
01
Undisturbed vs Remolded
02
Soil Sensitivity
03
Let us define first the basic things you have to learn in this topic

5. Field vane shear test
The vane shear test is an in-situ geotechnical testing
methods used to estimate the undrained shear
strength of fully saturated clays without disturbance.
The test is relatively simple, quick, and provides a
cost-effective way of estimating the soil shear strength;
therefore, it is widely used in geotechnical
investigations.

6. UNDISTURBED VS
REMOLDED
•Undisturbed soil is a type of soil that
has its internal structure unmodified
and undisturbed.
•Remolded soil is a type of soil that
has had its natural internal structure
modified or disturbed by manipulation
so that it lacks shear strength and
gains compressibility

7. SOIL SENSITIVITY
Soil sensitivity is defined as the ratio of
peak to remoulded shear strength
Soil sensitivity is an important measure
of the loss of strength and structure in
the soil body under the effect of static or
seismic loading
S = Undisturbed Shear Strength /
Remolded

8. PROCEDURE
FIELD TEST
02
03
04
Begin Penetration
01
SET-UP
05
Penetrate first 20 cm
Twist the device (for
undisturbed) twist
again for (remolded)
Repeat 3 and 4 until
desired depth

9. 1956
Opposed past
conclusions and
concluded that only
laboratory vane shear
test is reliable indicators
of soil sensitivity.
W. J. Eden and J. J. Hamilton

10. Lab Vane Shear Test
Under special condition, the vane shear test can be
also carried out in the laboratory on undisturbed soil
specimens; however, the use of the vane shear test in
in-situ testing is much more common.
The laboratory vane shear test for the measurement of
shear strength of cohesive soils. This test gives the
undrained strength of the soil, in undisturbed as well
as remoulded conditions both.

11. • Vane Shear Apparatus
• Specimen
• Specimen Container
• Calipers

12. PROCEDURE
LAB TEST
02
03
04
Mount the specimen
container with the
specimen on the base
of the vane shear
apparatus and fix it
securely to the base.
01
Prepare two or three
specimens of the soil
sample of dimensions of
at least 30.0 mm
diameter and 75 mm
long specimen.
05
Lower the shear vanes into the
specimen to their full length without
disturbing the soil specimen. The top
of the vanes should be atleast 10 mm
below the top of the specimen.
Rotate the vanes at a
uniform rate by suitably
operating the torque
applicator handle until the
specimen fails.
Note the final reading of the
torque indicator.
Rotate the vane
rapidly through 10
revolutions. The
remoulded strength
should then be
determined within 1
minute after
completion of the
revolution.

13. Benefits and Consequences
easy and quick to perform
can also be performed in
the laboratory
ideal for the determination of undrained
shear strength of non-fissured and
fully saturated clay
can also get the shear strength of soft
clays at greater depth
not suitable for clay which cont
ains sand or silt laminations
cannot be conducted on fissured
clay
if the failure envelope is horizontal, it do
es not give accurate results

14. “ Save the Earth, Our Mother,
Conserve and protect our Water,
Do it now, not Later,
Or We will Suffer, Forever.”

15. Thank You!